How to make Prime number checking programm in c language

Prime Number programm

#include<stdio.h> 

#include<conio.h> 

void main() 

{ 

int i,n,r=0; 

clrscr(); 

printf(“Enter any number ”); 

scanf(“%d”,&n); 

for(i=2; i<=n; i++) 

{   

 if(n%i==0) 

r=1; 

break; 

} 

if(r==0) 

printf(“number is prime no”); 

else 

printf(“number is Not prime”); 

getch(); 

}