programming

1. Checking whether the number is prime or not :
#include<stdio.h>
intmain(void)
{
intx=0;
inta=2;
intnum1;
printf("Enteranynumbern");
scanf("%d",&num1);
while(a<=num1/2){
if(num1%a==0){
x++;
break;}
a++;
}
if(x==0)
printf("Numberisprimen");
else
printf("Numberisnotprimen");
return0;
}