singlethreadload.c

#include <stdio.h>
#include <time.h>

void main() {
  while (1) {
    clock_t start, end;
    double runTime;
    start = clock();
    int i, num = 1, primes = 0;

    while (num <= 10000) { 
      i = 2; 
      while (i <= num) { 
        if(num % i == 0) { break; }
        i++; 
      }
      if (i == num) { primes++; }
      num++;
    }

    end = clock();
    runTime = (end - start) / (double) CLOCKS_PER_SEC;
    printf("This machine calculated all %d prime numbers under 10000 in %g seconds\nLets do that again\n", primes, runTime);
  }
}