arrays

[GOdliike123]

Write a program to perform an analysis of the rolling of two dice. Your
program should use rand()%6 + 1 to roll the first dice and again to roll the second dice.With each dice roll,the outcome of the rolls should be tallied in a6x6 two-dimensional array that represents all possible combinations of dice rolls(as seen below). Repeat this dice roll process 10,000 times. On completion,display a report that shows the total counts.

  int randdie;
    int randdie2;
    int die[6];
    int die2[6];
    int result[10000][10000];
    for (int i = 0; i < 10000; i++)
    {
        for (int j = 0; i < 10000; i++)
        {
            randdie = rand() % 6 + 1;
            randdie2 = rand() % 6 + 1;
            die[randdie];
            die2[randdie2];
            result[die[randdie]][die2[randdie2]];
        }
        if (i == 10000) {
            cout << i << endl;
        }

    }

    system("pause");
    return 0;

this is what i have done so far but i dont get the proper dice values inside the arrays :( where should i change?

[Thomas1965]

With each dice roll,the outcome of the rolls should be tallied in a6x6 two-dimensional array

Why do you create an array[10000][10000] ?

[whitenite1]

@GOdliike123

Problems..
Line 8. You have a for loop of j, but then check for i value.

lines 12, 13 and 14. You don't assign a value to the array locations

[GOdliike123]

thomas to store the results and whitenite idk i dont get the idea of how to use them

[Thomas1965]

Lets say the first throw of the dice is 1,1.
So you would increment the value of the array[1][1] by 1.
There are only 36 combinations possible so an array of 6 by 6 is enough.
Just be careful. array index is from 0..5 , but dice value 1..6

[Repeater]

die[randdie];

This fetches a value from the array named die. It fetches the value at the randdie element.

It doesn't change anything. It just fetches a value (which was never even set). It makes no sense at all.

die2[randdie2];
result[die[randdie]][die2[randdie2]];

These lines also. Fetching values, that were never set. Changing nothing. Doing nothing. Makes no sense.

[againtry]

#include <iostream>

int main()
{
    int roll[6][6]{0};
    
    int dice_1{0};
    int dice_2{0};
    
    for (int i = 0; i < 10000; i++)
    {
        dice_1 = rand() % 6 + 1;
        dice_2 = rand() % 6 + 1;
        
        roll[dice_1 - 1][dice_2 - 1]++;
    }
    
    for(int i = 0; i < 6; i++)
    {
        for(int j = 0; j < 6; j++)
        {
            std::cout
            << i + 1 << " - " << j + 1 << " occured "
            << roll[i][j] << " times\n";
        }
    }
    
    return 0;
}

[dutch]

#include <iostream>
#include <iomanip>

int main()
{
    const int Reps   = 100000,
              MaxVal = 6,
              Width  = 5,   // for setw()
              MaxBar = 60,  // max bargraph bar
              MaxCombo = MaxVal + MaxVal;

    int roll[MaxVal][MaxVal] {};
    int value[MaxCombo - 1] {};  // 2 to MaxCombo stored in 0 to MaxCombo-2

    for (int i = 0; i < Reps; i++)
    {
        int d1 = rand() % MaxVal, d2 = rand() % MaxVal;
        ++value[d1 + d2];
        ++roll[d1][d2];
    }
    
    std::cout << "   ";
    for (int c = 0; c < MaxVal; ++c)
        std::cout << std::setw(Width) << c + 1 << ' ';
    std::cout << '\n';
    for (int r = 0; r < MaxVal; ++r)
    {
        std::cout << std::setw(2) << r + 1 << ' ';
        for (int c = 0; c < MaxVal; ++c)
            std::cout << std::setw(Width) << roll[r][c] << ' ';
        std::cout << '\n';
    }

    int m = value[0];
    for (int i = 1; i < MaxCombo - 1; ++i)
        if (value[i] > m) m = value[i];

    std::cout << '\n';
    for (int i = 0; i < MaxCombo - 1; ++i)
        std::cout << std::setw(2) << i + 2 << ": " << std::setw(Width) << value[i] << ' '
                  << std::setfill('*') << std::setw(value[i]*MaxBar/m) << ""
                  << std::setfill(' ') << '\n';
}

       1     2     3     4     5     6 
 1  2760  2768  2875  2759  2791  2786 
 2  2778  2750  2827  2771  2767  2690 
 3  2763  2828  2841  2802  2816  2798 
 4  2795  2788  2883  2732  2815  2754 
 5  2723  2771  2762  2741  2769  2669 
 6  2777  2672  2752  2916  2793  2718 

 2:  2760 *********
 3:  5546 *******************
 4:  8388 *****************************
 5: 11209 ****************************************
 6: 13914 *************************************************
 7: 16786 ************************************************************
 8: 13672 ************************************************
 9: 11106 ***************************************
10:  8439 ******************************
11:  5462 *******************
12:  2718 *********

[lastchance]

#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;

int main()
{
   srand( time( 0 ) );
   const int ROLLS = 10000, SIDES = 6, SIDESSQ = SIDES * SIDES;
   int outcome[SIDESSQ]{}, freq[1+SIDES+SIDES]{};

   for (int i = 0; i < ROLLS; i++ )
   {
      int n = rand() % SIDESSQ;
      int die1 = n / SIDES + 1, die2 = n % SIDES + 1; 
      outcome[n]++;
      freq[die1+die2]++;
   }
    
   cout << "Outcomes:\n";
   for ( int n = 0; n < SIDESSQ; n++ ) cout << outcome[n] << ( ( n + 1 ) % SIDES ? '\t' : '\n' );

   cout << "\nSum frequencies:\n";
   for ( int n = 2; n <= SIDES + SIDES; n++ ) cout << n << ": " << freq[n] << '\n';
}

Outcomes:
297	291	268	292	274	265
279	281	279	307	274	264
321	280	301	256	303	242
306	242	274	268	269	278
284	256	280	285	275	286
268	273	260	296	263	263

Sum frequencies:
2: 297
3: 570
4: 870
5: 1157
6: 1408
7: 1593
8: 1388
9: 1056
10: 849
11: 549
12: 263