C program to print n prime numbers

C program to print n prime numbers

Output:

How many Prime Numbers ?
10
2 3 5 7 11 13 17 19 23 29

Implementation:

#include <stdio.h> int checkprime(int n) { int i; if(n<=1) return 0; if(n>=2 && n<=3) return 1; if(n%2==0 || n%3==0) return 0; else { for(i=5;i*i<=n;i+=6) { if(n%i==0 || n%(i+2)==0) return 0; } return 1; } } int main(void) { int n,i,count=0; printf("How many Prime Numbers?\n"); scanf("%d",&n); i=2; while(1) { if(count==n) break; if(checkprime(i)) { printf("%d ",i); count++; } i++; } return 0; }