C-Program to Check a Number Prime or Not

#include<stdio.h>
main ()
{
int n,i,r;
printf("Enter the Number to be checked\t");
scanf("%d",&n);
if(n==0)
{
printf("0 is considered as neither composite nor prime\n");
exit(0);
}
if(n==1)
{
printf("1 is prime\n");
exit(0);
}
for(i=2;i<sqrt(n);i++)
{
r=n%i;
if(r==0)
{
printf("%d is not a prime Number ! it is Composite\n",n);;
exit(0);
}
}
printf("%d is a Prime Number\n",n);
}

output