Prime Number Generator in C++

A simple program that I wrote using C++ as my programming language that will ask the user to give a number and then the program will generate the corresponding prime numbers based from the number give by our user. I wrote a function for prime number generation in this sample program of ours.

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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");

}