How can I display my object of my class?

[Shishykish]

Hello,

Been working on a problem using a class and friend function to convert polar coordinates into polar ones. I just cannot see why I cannot display the newly calculated x and y values after calculation from my friend function.

  #include <iostream>
#include <cmath>

using namespace std;

class Coord
{

friend Coord convPol(double, double);

private:
    double xval;
    double yval;

public:
    Coord(double = 0, double = 0);
    void display();
};

Coord::Coord(double x, double y)
{
    xval = x;
    yval = y;
}

void Coord::display()
{
    cout << "The x co-ordinate is " << xval << endl;
    cout << "The y co-ordinate is " << yval << endl;

    return;
}

Coord convPol(double r, double theta)
{

    Coord a;

    a.xval = r * sin(theta);
    a.yval = r * cos(theta);

    return a;
}

int main()
{
    double r = 0;
    double theta = 0;

    cout << "This program will convert polar co-ordinates to x and y co-ordinates" << endl;
    cout << "Enter your values for r and theta" << endl;
    cin >> r;
    cin >> theta;

    Coord a (convPol(r,theta));

    cout << "The values for x and y are " << a.display();

    return 0;
}

[AbstractionAnon]

Coord::display is a void function, so at line 57 you're trying to cout a void.
Put a.display() on its own line (not part of a cout statement).

[narendranath]

Hi ,

At first, you don't need return in the void Coord::display() . Void won't return any value.

One should use return only if the type of fucntion is returning something. like

int add(int x , int y){return x+y;}

And in the main() , again No need of cout << "The values for x and y are " << a.display();

Calling display() with object is enough. In your case:

Coord a (convPol(r,theta));
a.display();

will do the task.

[Shishykish]

Hello,

Thanks again! All working smoothly!