WAP to check enter no. is prime or not

/*WAP to check enter no. is prime or not*/

#include<stdio.h>
#include<conio.h>
void main()
{
int num1,num,flage,i=2;
clrscr();
printf("enter no.");
scanf("%d",&num);
num1=num/2;
while(i<=num1)
{
if(num%i==0)
{
flage=1;
}
i++;
}
{
if(flage==1)
printf("not prime");
else
printf("prime");
getch();
}
}

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