#include <stdio.h> int main(){ int n,k; int i; do{ printf("Enter a value until you want to show primes: "); scanf("%d",&n); }while(n<=0); for(i=1;i<=n;i++){ for(k=2;k<i,i%k;k++){ if(k>i/2){ printf("%d, ",i); break; } } } return 0; }