Prime number without the modulo operator and used another logic to define it. Like division without '/' operator.

Prime_number_without_modulo.c

#include<stdio.h>
#include<conio.h>
void main()
{
  int num,i,temp=0,temp2,a,b;
	clrscr();
	printf("Enter number to check whether prime or not:");
	scanf("%d",&num);
	for(i=2;i<num;i++)
	{
		a=num;
		b=i;
		while(a>=b)
		{
			a=a-b;
			temp2=a;
		}
		if(temp2==0)
		{
			temp++;
			break;
		}
	}
	if(temp!=1)
	{
		printf("%d is prime.",num);
	}
	else
	{
		printf("%d isn't prime.",num);
	}
	getch();
}