RosettaCodeData/Task/Playfair-cipher/Phix/playfair-cipher.phix

(phixonline)-->
 <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 <span style="color: #008080;">constant</span> <span style="color: #000000;">keyword</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"Playfair example"</span><span style="color: #0000FF;">,</span>
          <span style="color: #000000;">option</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'Q'</span> <span style="color: #000080;font-style:italic;">-- ignore Q
 --       option = 'J' -- replace J with I</span>

 <span style="color: #004080;">sequence</span> <span style="color: #000000;">table</span><span style="color: #0000FF;">,</span>
          <span style="color: #000000;">findchar</span>

 <span style="color: #008080;">procedure</span> <span style="color: #000000;">build_table</span><span style="color: #0000FF;">()</span>
     <span style="color: #000000;">table</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #008000;">' '</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">),</span><span style="color: #000000;">5</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">findchar</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">26</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">findchar</span><span style="color: #0000FF;">[</span><span style="color: #000000;">option</span><span style="color: #0000FF;">-</span><span style="color: #008000;">'A'</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">}</span>
     <span style="color: #000080;font-style:italic;">-- (note any (J/Q) in keyword are simply ignored)</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">alphabet</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">upper</span><span style="color: #0000FF;">(</span><span style="color: #000000;">keyword</span><span style="color: #0000FF;">)</span> <span style="color: #0000FF;">&</span> <span style="color: #7060A8;">tagset</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'Z'</span><span style="color: #0000FF;">,</span><span style="color: #008000;">'A'</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">integer</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span>
     <span style="color: #008080;">for</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">alphabet</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
         <span style="color: #004080;">integer</span> <span style="color: #000000;">c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">alphabet</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">>=</span><span style="color: #008000;">'A'</span> <span style="color: #008080;">and</span> <span style="color: #000000;">c</span><span style="color: #0000FF;"><=</span><span style="color: #008000;">'Z'</span> <span style="color: #008080;">then</span>
             <span style="color: #004080;">integer</span> <span style="color: #000000;">d</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">-</span><span style="color: #008000;">'A'</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span>
             <span style="color: #008080;">if</span> <span style="color: #000000;">findchar</span><span style="color: #0000FF;">[</span><span style="color: #000000;">d</span><span style="color: #0000FF;">]=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
                 <span style="color: #000000;">table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">c</span>
                 <span style="color: #000000;">findchar</span><span style="color: #0000FF;">[</span><span style="color: #000000;">d</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">i</span><span style="color: #0000FF;">,</span><span style="color: #000000;">j</span><span style="color: #0000FF;">}</span>
                 <span style="color: #000000;">j</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
                 <span style="color: #008080;">if</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">6</span> <span style="color: #008080;">then</span>
                     <span style="color: #000000;">i</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
                     <span style="color: #008080;">if</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">6</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> <span style="color: #000080;font-style:italic;">-- table filled</span>
                     <span style="color: #000000;">j</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span>
                 <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
             <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
 <span style="color: #000000;">build_table</span><span style="color: #0000FF;">()</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">clean_text</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">plaintext</span><span style="color: #0000FF;">)</span>
 <span style="color: #000080;font-style:italic;">--
 -- get rid of any non-letters and insert X between duplicate letters
 --</span>
     <span style="color: #000000;">plaintext</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">upper</span><span style="color: #0000FF;">(</span><span style="color: #000000;">plaintext</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">cleantext</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
     <span style="color: #004080;">integer</span> <span style="color: #000000;">prevChar</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
     <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">plaintext</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
         <span style="color: #004080;">integer</span> <span style="color: #000000;">nextChar</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">plaintext</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">nextChar</span><span style="color: #0000FF;">>=</span><span style="color: #008000;">'A'</span> <span style="color: #008080;">and</span> <span style="color: #000000;">nextChar</span><span style="color: #0000FF;"><=</span><span style="color: #008000;">'Z'</span>
         <span style="color: #008080;">and</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">nextChar</span><span style="color: #0000FF;">!=</span><span style="color: #008000;">'Q'</span> <span style="color: #008080;">or</span> <span style="color: #000000;">option</span><span style="color: #0000FF;">!=</span><span style="color: #008000;">'Q'</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
             <span style="color: #008080;">if</span> <span style="color: #000000;">nextChar</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'J'</span> <span style="color: #008080;">and</span> <span style="color: #000000;">option</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'J'</span> <span style="color: #008080;">then</span> <span style="color: #000000;">nextChar</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'I'</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
             <span style="color: #008080;">if</span> <span style="color: #000000;">nextChar</span><span style="color: #0000FF;">=</span><span style="color: #000000;">prevChar</span> <span style="color: #008080;">then</span>
                 <span style="color: #000000;">cleantext</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">'X'</span>
             <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
             <span style="color: #000000;">cleantext</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">nextChar</span>
             <span style="color: #000000;">prevChar</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">nextChar</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #008080;">if</span> <span style="color: #7060A8;">odd</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cleantext</span><span style="color: #0000FF;">))</span> <span style="color: #008080;">then</span>
         <span style="color: #000080;font-style:italic;">-- dangling letter at end so add another letter to complete digraph</span>
         <span style="color: #000000;">cleantext</span> <span style="color: #0000FF;">&=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cleantext</span><span style="color: #0000FF;">[$]=</span><span style="color: #008000;">'X'</span><span style="color: #0000FF;">?</span><span style="color: #008000;">'Z'</span><span style="color: #0000FF;">:</span><span style="color: #008000;">'X'</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">cleantext</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">remove_x</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">2</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">text</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'X'</span>
         <span style="color: #008080;">and</span> <span style="color: #0000FF;">((</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">' '</span> <span style="color: #008080;">and</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">-</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]=</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span> <span style="color: #008080;">or</span>
              <span style="color: #0000FF;">(</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">' '</span> <span style="color: #008080;">and</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]=</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]))</span> <span style="color: #008080;">then</span>
             <span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'_'</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">text</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">playfair</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">step</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">d</span><span style="color: #0000FF;">)</span>
     <span style="color: #000080;font-style:italic;">--
     -- text may be the plaintext or the encoded version
     -- step is 2 for plaintext, 3 for encoded(/skip spaces)
     -- d is {2,3,4,5,1} instead of mod(+1,5), or
     --      {5,1,2,3,4}   --           -1
     --</span>
     <span style="color: #004080;">string</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
     <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">text</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">by</span> <span style="color: #000000;">step</span> <span style="color: #008080;">do</span>
         <span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">row1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">col1</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">findchar</span><span style="color: #0000FF;">[</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]-</span><span style="color: #008000;">'A'</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span>
                 <span style="color: #0000FF;">{</span><span style="color: #000000;">row2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">col2</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">findchar</span><span style="color: #0000FF;">[</span><span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]-</span><span style="color: #008000;">'A'</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">></span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">" "</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #008080;">if</span> <span style="color: #000000;">row1</span><span style="color: #0000FF;">=</span><span style="color: #000000;">row2</span> <span style="color: #008080;">then</span>
             <span style="color: #0000FF;">{</span><span style="color: #000000;">col1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">col2</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">d</span><span style="color: #0000FF;">[</span><span style="color: #000000;">col1</span><span style="color: #0000FF;">],</span><span style="color: #000000;">d</span><span style="color: #0000FF;">[</span><span style="color: #000000;">col2</span><span style="color: #0000FF;">]}</span>
         <span style="color: #008080;">elsif</span> <span style="color: #000000;">col1</span><span style="color: #0000FF;">=</span><span style="color: #000000;">col2</span> <span style="color: #008080;">then</span>
             <span style="color: #0000FF;">{</span><span style="color: #000000;">row1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">row2</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">d</span><span style="color: #0000FF;">[</span><span style="color: #000000;">row1</span><span style="color: #0000FF;">],</span><span style="color: #000000;">d</span><span style="color: #0000FF;">[</span><span style="color: #000000;">row2</span><span style="color: #0000FF;">]}</span>
         <span style="color: #008080;">else</span>
             <span style="color: #0000FF;">{</span><span style="color: #000000;">col1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">col2</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">col2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">col1</span><span style="color: #0000FF;">}</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
         <span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">row1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">col1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">row2</span><span style="color: #0000FF;">][</span><span style="color: #000000;">col2</span><span style="color: #0000FF;">]</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">encode</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">plaintext</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">playfair</span><span style="color: #0000FF;">(</span><span style="color: #000000;">clean_text</span><span style="color: #0000FF;">(</span><span style="color: #000000;">plaintext</span><span style="color: #0000FF;">),</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">})</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">decode</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">ciphertext</span><span style="color: #0000FF;">)</span>
     <span style="color: #000080;font-style:italic;">-- ciphertext includes spaces we need to skip, hence by 3</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">remove_x</span><span style="color: #0000FF;">(</span><span style="color: #000000;">playfair</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ciphertext</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">}))</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Playfair keyword : %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">keyword</span><span style="color: #0000FF;">})</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Option: J=I or no Q (J/Q) : %s\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">option</span><span style="color: #0000FF;">)</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"The table to be used is :\n\n%s\n\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">table</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)})</span>
 <span style="color: #004080;">string</span> <span style="color: #000000;">plaintext</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"Hide the gold...in the TREESTUMP!!!!"</span><span style="color: #0000FF;">,</span>
        <span style="color: #000000;">encoded</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">encode</span><span style="color: #0000FF;">(</span><span style="color: #000000;">plaintext</span><span style="color: #0000FF;">),</span>
        <span style="color: #000000;">decoded</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">decode</span><span style="color: #0000FF;">(</span><span style="color: #000000;">encoded</span><span style="color: #0000FF;">)</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"The plain text : %s\n\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">plaintext</span><span style="color: #0000FF;">})</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Encoded text is : %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">encoded</span><span style="color: #0000FF;">})</span>
 <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Decoded text is : %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">decoded</span><span style="color: #0000FF;">})</span>
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