tasks a-s

Task/Roman-numerals-Encode/C/roman-numerals-encode-2.c

@@ -0,0 +1,38 @@
+char *ToRoman(int num, char *buf, int buflen)
+{
+   static const char romanDgts[] = "ivxlcdmVXLCDM_";
+   char *roman = buf + buflen;
+   int  rdix, r, v;
+   *--roman = '\0';        /* null terminate return string */
+   if (num >= 4000000) {
+      printf("Number Too Big.\n");
+      return NULL;
+      }
+   for (rdix = 0; rdix < strlen(romanDgts); rdix += 2) {
+      if (num == 0) break;
+      v = (num % 10) / 5;
+      r = num % 5;
+      num = num / 10;
+      if (r == 4) {
+         if (roman < buf+2) {
+            printf("Buffer too small.");
+            return NULL;
+            }
+         *--roman = romanDgts[rdix+1+v];
+         *--roman = romanDgts[rdix];
+         }
+      else {
+         if (roman < buf+r+v) {
+            printf("Buffer too small.");
+            return NULL;
+            }
+         while(r-- > 0) {
+            *--roman = romanDgts[rdix];
+            }
+         if (v==1) {
+            *--roman = romanDgts[rdix+1];
+            }
+         }
+      }
+   return roman;
+}