Write a C++ program that declares an array alpha of 50 components of type double

Question

Write a C++ program that declares an array alpha of 50 components of type double in the main function.

Create a function initialize() that initializes the array so that the first 25 components are equal to the square of the index variable, and the last 25 components are equal to three times the index variable.

Create a second function print() that outputs the array so that 10 elements per line are printed.   

#include <iostream>
#include <iomanip>

using namespace std;

void initialize(double list[], int size);
void print(double list[], int size);

int main()
{
    /* Type your code here */
    return 0;
}

void initialize(double list[], int size)
{
    /* Type your code here */
}

void print(double list[], int size)
{
    /* Type your code here */
}

Explanation / Answer

#include <iostream>
#include <iomanip>

using namespace std;

void initialise_array(double alpha[]);
void print_array(const double alpha[]);

int main()
{
    double alpha[50];
    initialise_array(alpha);
    print_array(alpha);
    return 0;
}

void initialise_array(double alpha[]) {
    for (int i = 0; i < 50; i++) {
        if (i < 25)
            alpha[i] = i * i;
        else
            alpha[i] = i * 3;
    }
}

void print_array(const double alpha[]) {
    int counter = 0;
    for (int j = 1; j <= 5; j++) {
        for (int i = 1; i <= 10; i++) {
            if (counter < 50)
                cout << setw(5) << alpha[counter];
            else
                break;
            counter++;
    }
        cout << endl;
    }
}

sample output

    0    1    4    9   16   25   36   49   64   81                                                                                                          
100 121 144 169 196 225 256 289 324 361                                                                                                          
400 441 484 529 576   75   78   81   84   87                                                                                                          
   90   93   96   99 102 105 108 111 114 117                                                                                                          
120 123 126 129 132 135 138 141 144 147                                                                                                          

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