A Prime Number is a number which can be divided only by 1 or by itself. And it must be a whole number greater than 1. No even number, except 2, is prime number as 2 is divided by 1 or 2 only i.e by 1 or by itself. Following program check a number is prime or not. The approach is simple, we ask user to enter a number (num). Then a loop is initiated to num-1 and we apply modulus operator to determine whether it gives remainder or not. If it gives remainder 0 , it is not a prime number.
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
int main()
{
clrscr();
int num;
int i=2;
cout<<” Enter a Number which you want to determine”;
cin>>num;
while(i<=num-1)
{
if(num%i==0)
{
cout<<“\n\n\t”<<num<<” is not a prime number”;
break;
}
i++;
}
if(i==num)
{
cout<<“\n\n\t”<<num<<” is prime number”;
}
getch();
}
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