C program to check whether entered number is prime or not

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