Question

Find the errors in the following program. You must use pass by reference.

#include <iostream>

using namespace std;

void area2(int area, int length, int width = 0);

int main()
{
int length, width, area;

// for rectangle use two arguments
cout << "Enter length and width of a rectangle" << endl;
cin >> length >> width;

cout << "The area is " << area2(area, length, width) << endl;

// for squares use one argument
cout << "Enter side of a square" << endl;
cin >> length;

cout << "The area is " << area2(area, length) << endl;

return 0;
}

void area2(int area, int length, int width)
{
if ( width == 0 )
area = length * length;
else
area = length * width;
}

Answer 1

#include <iostream>

using namespace std;

void area2(int &area, int length, int width = 0);

int main()
{
int length, width, area;

// for rectangle use two arguments
cout << "Enter length and width of a rectangle" << endl;
cin >> length >> width;
area2(area, length, width);
cout << "The area is " << area << endl;

// for squares use one argument
cout << "Enter side of a square" << endl;
cin >> length;
area2(area, length);
cout << "The area is " << area << endl;

return 0;
}

void area2(int &area, int length, int width)
{
if ( width == 0 )
area = length * length;
else
area = length * width;
}