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Task/Extensible-prime-generator/Seed7/extensible-prime-generator.seed7

@@ -0,0 +1,64 @@
+$ include "seed7_05.s7i";
+
+const func boolean: isPrime (in integer: number) is func
+  result
+    var boolean: result is FALSE;
+  local
+    var integer: count is 2;
+  begin
+    if number = 2 then
+      result := TRUE;
+    elsif number > 2 then
+      while number rem count <> 0 and count * count <= number do
+        incr(count);
+      end while;
+      result := number rem count <> 0;
+    end if;
+  end func;
+
+var integer: currentPrime is 1;
+var integer: primeNum is 0;
+
+const func integer: getPrime is func
+  result
+    var integer: prime is 0;
+  begin
+    repeat
+      incr(currentPrime);
+    until isPrime(currentPrime);
+    prime := currentPrime;
+    incr(primeNum);
+  end func;
+
+const proc: main is func
+  local
+    var integer: aPrime is 0;
+    var integer: count is 0;
+  begin
+    write("First twenty primes:");
+    while primeNum < 20 do
+      write(" " <& getPrime);
+    end while;
+    writeln;
+    repeat
+      aPrime := getPrime;
+    until aPrime >= 100;
+    write("Primes between 100 and 150:");
+    while aPrime <= 150 do
+      write(" " <& aPrime);
+      aPrime := getPrime;
+    end while;
+    writeln;
+    repeat
+      aPrime := getPrime;
+    until aPrime >= 7700;
+    while aPrime <= 8000 do
+      incr(count);
+      aPrime := getPrime;
+    end while;
+    writeln("Number of primes between 7,700 and 8,000: " <& count);
+    repeat
+      aPrime := getPrime;
+    until primeNum = 10000;
+    writeln("The 10,000th prime: " <& getPrime);
+  end func;