Checking Prime Number in C++

Here is a sample program that I wrote a long time ago in C++ to check for prime numbers. I have a very busy schedule at work that why I was not able to update my blog. Anyway I hope you will find my work useful in your programming assignments in C++ programming.

If you have some questions please send me an email at jakerpomperada@gmail.comand jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

Program Listing

#include <iostream.h>

 int check_prime(int x)

 {

 int var1=0,var2=0,flag=0;

 cout << "\n\n";

 cout << "\t List of Prime Numbers";

 cout << "\n\n";

 for(var1 = 2; var1 <= x; var1++){

flag = 1;

for(var2 = 2; var2 < var1; var2++){

if((int)var1 % (int)var2 == 0){

flag = 0;

}

}

if(flag == 1){

cout << var2;

cout << " ";

}

}

 }

 main(){

   int values=0;

   cout << "\t\tPrime Number Generator Version 1.0";

   cout << "\n\n";

   cout << "Enter a Number : ";

   cin >> values;

   check_prime(values);

cout << "\n\n";

system("pause");

}