C program to check a number is prime or not using function.
C Program
#include <stdio.h> #include <conio.h> void main() { int num,res=0; clrscr(); printf("\nENTER A NUMBER: "); scanf("%d",&num); res=prime(num); if(res==0) printf("\n%d IS A PRIME NUMBER",num); else printf("\n%d IS NOT A PRIME NUMBER",num); getch(); } int prime(int n) { int i; for(i=2;i<=n/2;i++) { if(n%i!=0) continue; else return 1; } return 0; }