Thread: Problem with lottery game

Hello! I programmed a little game, which runs a while loop for a couple of seconds, that is constrantly generating random numbers and at the end, the program outputs the most commonly generated number. My problem is that everytime I run the program, the most common number is always 90.

Code:

#include <iostream>
#include <stdlib.h>
#include <time.h>


using namespace std;


int main() {


    time_t end = time(NULL) + 5; // time


    int retVal = 0;
    int mcn = 0;
    int arr[90];


    for(int x = 0; x < 90; x++) {
        arr[x] = 0;
    }


    srand(time(NULL));


    while (time(NULL) < end) {
         int n = rand() % 90;


        cout << n << endl;


        for(int x = 0; x < 90; x++) {
            if(arr[x] == n)
                arr[x]++;
        }


    }


    for(retVal = 0; retVal < 90; retVal++) {
        if(arr[retVal] > mcn)
            mcn = arr[retVal];
    }




    cout << "The most common number is: " << mcn<< endl;


    return 0;
}

Also note that rand() is very biased depending on the implementation, and so is "% 90".
I suggest you use C++11's <random> header.