C Program For Prime Number

Program 1

// Progrtam for prime number
#include<stdio.h>
#include<conio.h>
int main()
{
     int n,i=2,f=0;
     printf("Enter a number");
     scanf("%d",&n);
    while(i<n-1)
     {
           if(n%i==0)
           {
            f=1;
            break;
           }
          i++; 
     }
     if(f==0)
     printf("\nNo is prime");
     else
     printf("\nNo is not prime");
}