#include<stdio.h>

int CheckForPrime(int); int i;

int main() { int n1,PrimeNo; printf("Input any positive number:-\n"); scanf("%d",&n1); i=n1/2; PrimeNo=CheckForPrime(n1); if(PrimeNo==1) { printf("The number %d is a prime number\n",n1); } else { printf("The number %d is not a prime number\n",n1); } return 0; }

int CheckForPrime(int n1) { if(i==1) { return 1; } else if(n1%i==0) { return 0; } else { i=i-1; CheckForPrime(n1); } }