How to calculate area and perimeter of rectangle using call be reference in C++

Program to calculate Area and Perimeter of Rectangle using Call by Reference

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#include<iostream>

#include<conio.h>

using namespace std;

void area_cal(int length, int breadth, int * area);

void perimeter_cal(int length, int breadth, int *perimeter);

int main()

{

       int length = 0, breadth = 0, area = 0, perimeter = 0;

       cout << "\n\n\t\t\t__ Area and Perimeter __";

       cout << "\n\n\n  Enter the Length   -  ";

       cin >> length;

       cout << "\n\n\n  Enter the Breadth  -  ";

       cin >> breadth;

       area_cal(length, breadth, &area);

       perimeter_cal(length, breadth, &perimeter);

       cout << "\n\n\n\t\t Area  -  " << area << "\t Perimeter  -  " << perimeter;

       getch();

       return 0;

}

void area_cal(int length, int breadth, int *area)

{

       *area = length * breadth;

}

void perimeter_cal(int length, int breadth, int *perimeter)

{

       *perimeter = 2 * (length + breadth);

}

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