CPP027_Functions_and_Pointers.cpp

/**
 * Author:    Tridib Samanta
 * Created:   17.01.2020
 **/

#include <iostream>
using namespace std;

void multiplyBy(int *, int);
void multiplyArrayBy(int *, int, int);

int main()
{

    int a = 10;

    multiplyBy(&a, 5);

    cout << a << endl;
    cout << endl;

    int array[10];
    cout << sizeof(array) / sizeof(array[0]) << endl;

    for (int i = 0; i < sizeof(array) / sizeof(array[0]); i++)
    {
        array[i] = i;
        cout << "array [" << i << "] = " << array[i] << endl;
    }

    multiplyArrayBy(array, 5, sizeof(array) / sizeof(array[0])); // array = &array[0]

    for (int i = 0; i < sizeof(array) / sizeof(array[0]); i++)
    {
        cout << "array [" << i << "] = " << array[i] << endl;
    }

    return 0;
}

void multiplyBy(int *var, int amount)
{
    *var = *var * amount;
}

void multiplyArrayBy(int *array, int amount, int sizeOfArray)
{
    while (sizeOfArray--)
        array[sizeOfArray] *= amount;

    /*
    for(int i=0;i<sizeOfArray;i++) {
        array[i] *= amount;
    } */
}