Question

/* Array expander: Write a function that accepts an int array as argument. The function should create a new array that is n times the size of the argument array, where n is a user input.
The function should copy the contents of the argument array to the new array, and initialize the unused elements of the second array with 0. The function should return a pointer
to the new array */

#include <iostream>
using namespace std;

const int NUM_ELEM = 5;
int* expandArray(int *a, int expFactor);

int main()
{
    int origArr[NUM_ELEM], n;
    for (int i = 0; i < NUM_ELEM; ++i)
        origArr[i] = i;
    cout << "Original array" << endl;
    for (int i = 0; i < NUM_ELEM; ++i)
        cout << origArr[i] << " ";
    cout << endl;

cout << "By how many times should the new array grow" << endl;

cin >> n;
    int *newArr = expandArray(origArr, n);
    for (int i = 0; i < n*NUM_ELEM; ++i)
        cout << newArr[i] << " ";
    cout << endl;
    delete [] newArr;
    return 0;
}

int* expandArray(int *a, int expFactor)
{
        // Your code goes here
}

Answer 1

Dear Student,

below i have completed the given C++ program as per the requirement.

Please note that the below program is tested on ubuntu 14.04 sytem and compiled in g++ compiler. This program will also work on other IDE's

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Program:

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#include <iostream>

using namespace std;

const int NUM_ELEM = 5;

int* expandArray(int *a, int expFactor);

int main()
{
    int origArr[NUM_ELEM], n;

    for (int i = 0; i < NUM_ELEM; ++i)

        origArr[i] = i;

    cout << "Original array" << endl;

    for (int i = 0; i < NUM_ELEM; ++i)

        cout << origArr[i] << " ";

    cout << endl;

    cout << "By how many times should the new array grow" << endl;

     cin >> n;

    int *newArr = expandArray(origArr, n);

    for (int i = 0; i < n*NUM_ELEM; i++)

    cout << *(newArr+i) << " ";

    cout << endl;

    //delete [] newArr;

    return 0;
}

//complete defintion

int* expandArray(int *a, int expFactor)
{
        // Your code goes here

int *copy_array = new int[NUM_ELEM * expFactor];

for(int i = 0 ; i< NUM_ELEM; i++)

{

*(copy_array+i) = *(a+i);

}

return copy_array;

}

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Output:

nirmalsharma@ubuntu:-/HomeworkLib solutions/04_02_2018$ g++ resize_array.cpp nirmalsharna@ubuntu:: ~/HomeworkLib-solutions/04-02-20185 ../1.031Iİİ original array 0 1 2 3 4 By how many tines should the new array grow 2 01 2 340000 nirmalsharma@ubuntu:~/HomeworkLib_solutions/04_02_2018$

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Kindly Check and Verify Thanks...!!!