**Prime Number Evaluation Using Function**

In this program we are going to evaluate if a number is prime number or not using functions in C programming.

To learn basics of function in C programming Click Here.

**Example :**

#include<stdio.h> #include<conio.h>
//Declaration of prime funtion int prime(int x);
void main() { int x; clrscr();
//Taking number from the user to check if it's prime or not printf("\nEnter a number:"); scanf("%d",&x);
//calling prime number for true of false if(prime(x)) printf("\nNumber is Prime"); else printf("\nNumber is not prime"); getch(); }
//Definition of prime function int prime(int n) { int checkprime=0,i; for(i=2;i<n;i++) { if(n%i==0) checkprime=1; } if(checkprime==0) return 1; else return 0; } |

**Output :**

**For More GTU C Programming Lab Experiments Click Here**