//dice.cpp #include #include #include #include using namespace std; int main() {

Question

//dice.cpp
#include
#include
#include
#include
using namespace std;

int main()
{
const long ROLLS = 36000;
const int SIZE = 13;

// array exepected contains counts for the expected
// number of times each sum occurs in 36 rolls of the dice
/* Write the declaration of array exprected here. Assign an
initializer list containing the expected values here. Use
SIZE for the number of elements */
int x; // first die
int y; // second die
/* Write declaration for array sum here. Initialize all
elements to zero. Use SIZE for the number of elements */

srand( time( 0 ) );

// roll dice 36,000 times
/* Write a for loop that iterates ROLLS times. Randomly
generate values for x (i.e., die1) and y (i,e, die2)
and increment the appropriate counter in array sum that
corresponds to the sum of x and y */

cout << setw( 10 ) << "Sum" << setw( 10 ) << "Total" << setw( 10 )
<< "Expected" << setw( 10 ) << "Actual " << fixed << showpoint;

// display results of rolling dice
for ( int j = 2; j < SIZE; j++ )
cout << setw( 10 ) << j << setw( 10 ) << sum[ j ]
<< setprecision( 3 ) << setw( 9 )
<< 100.0 * expected[ j ] / 36 << "%" << setprecision( 3 )
<< setw( 9 ) << 100.0 * sum[ j ] / 36000 << "% ";

System ("pause") ;
return 0;
} // end main

Explanation / Answer

//dice.cpp
#include<iostream>
#include <stdlib.h>
#include <time.h>
#include<iomanip>
using namespace std;

int main()
{
const long ROLLS = 36000;
const int SIZE = 13;

/* array expected contains counts for the expected
      number of times each sum occurs in 36 rolls of the dice */
   int expected[ SIZE ] = { 0, 0, 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1};
// array exepected contains counts for the expected
// number of times each sum occurs in 36 rolls of the dice
/* Write the declaration of array exprected here. Assign an
initializer list containing the expected values here. Use
SIZE for the number of elements */
int x; // first die
int y; // second die
/* Write declaration for array sum here. Initialize all
elements to zero. Use SIZE for the number of elements */
int sum[SIZE] = { 0 };
srand( time( 0 ) );

// roll dice 36,000 times
/* Write a for loop that iterates ROLLS times. Randomly
generate values for x (i.e., die1) and y (i,e, die2)
and increment the appropriate counter in array sum that
corresponds to the sum of x and y */
for (int i = 1; i <= ROLLS; i++ ) {
      x = 1 + rand() % 6;
      y = 1 + rand() % 6;
      ++sum[ x + y ];
   } /* end for */
cout << setw( 10 ) << "Sum" << setw( 10 ) << "Total" << setw( 10 )
<< "Expected" << setw( 10 ) << "Actual " << fixed << showpoint;

// display results of rolling dice
for ( int j = 2; j < SIZE; j++ )
cout << setw( 10 ) << j << setw( 10 ) << sum[ j ]
<< setprecision( 3 ) << setw( 9 )
<< 100.0 * expected[ j ] / 36 << "%" << setprecision( 3 )
<< setw( 9 ) << 100.0 * sum[ j ] / 36000 << "% ";

return 0;
} // end main

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