loesung-3-4.c

#include <stdio.h>

int main (void)
{
  int n, i, divisors;
  for (n = 0; n < 100; n++)
    {
      divisors = 0;
      for (i = 1; i <= n; i++)
        if (n % i == 0)
          divisors++;
      if (divisors == 2)
        printf ("%d ist eine Primzahl.\n", n);
    }
  return 0;
}