Thread: Dice random generator problem

  1. #1
    Registered User
    Join Date
    May 2010

    Dice random generator problem

    The purpose of this problem is to simulate the tossing of two dice using an array of ints and the C++ random number generator rand(). When a pair of dice is tossed, the total number of spots showing on their faces are counted and this count is used as the index into an array consisting of 13 int elements. The random number generator will produce an int number from 0 to 12. A number which is either 0 or 1 is discarded. All other numbers are used as indexes into the array elements. The values of all array elements will be initialized to 0. Each indexed array element will be incremented by 1. The program will run until a total of 1,000 increments have been applied to array elements 2 through 12. Then, the program will display the counts in each of the array elements 2 through 12 and terminate.

    Any help I can get would be greatly appreciated, I am kinda new at this and to get off on the right foot would be a lot of help, thanks!

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    What have you tried?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    Registered User
    Join Date
    May 2010


    I tried this, but I think I am way off base:

    #include <iostream> 
    #include <cstdlib> 
    #include <time.h> 
    using namespace std; 
    int rollDice(); 
    int main(int argc, char* argv) 
        int numRolls; 
        int arrRolls[12]; 
        int dieRoll; 
        for (int k = 0; k < 12; k++) 
            arrRolls[k] = 0; 
        for (int i = 1; i <= numRolls; i++) 
            dieRoll = rollDice(); 
            cout << "Die Roll " << i << ": " << dieRoll << endl; 
            arrRolls[dieRoll - 1]++; 
        for (int j = 0; j < 12; j++) 
            cout << "The number " << j + 1 << " was rolled " << arrRolls[j] << " times." << endl; 
    int rollDice() 
        int result; 
        result = (rand() % 12) + 1; 
        return result; 
    Last edited by cgalvani; 05-05-2010 at 10:17 AM.

  4. #4
    and the Hat of Guessing tabstop's Avatar
    Join Date
    Nov 2007
    Why are you asking how many times the dice are to be rolled? That's fixed in the problem statement. You're still allowing a roll of 1 to happen. The specs state that you need to have an array with 13 elements in it, and also that the dice roll itself must be used as the index element.

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