How do I get different numbers every time I run this c++ program?

Question

I am using rand() to generate a random number and display it in the context of an arithmetic problem. I get the same two numbers everytime. How do I make these different each time?

#include <iostream>
#include<cstdlib>

using namespace std;

int main()
{

    int numberOne = rand()%1000;
    int numberTwo = rand()%1000;
    int numberThree = numberOne + numberTwo;
    char input;

    cout  << " " << numberOne << endl;
    cout <<  "+" << numberTwo << endl;
    cout << "----";
    cin.get();
    cout << numberThree << endl;
}

@Jarod42 -- notice how using `` facilities to replace `srand/rand` doesn't affect the problem in the slightest. The seeding issue is still there. — Pete Becker, Sep 08 '18 at 12:45

score 1 · Accepted Answer · edited Sep 08 '18 at 00:31

#include <iostream>
#include<cstdlib>

using namespace std;

int main()
{

    /* initialize random seed: */
    srand (time(NULL));

    int numberOne = rand()%1000;
    int numberTwo = rand()%1000;
    int numberThree = numberOne + numberTwo;
    char input;

    cout  << " " << numberOne << endl;
    cout <<  "+" << numberTwo << endl;
    cout << "----";
    cin.get();
    cout << numberThree << endl;
}

In order for you to get a random number you need to provide a seed.

How do I get different numbers every time I run this c++ program?

1 Answers1