Question

Use the concept of function override in C++ and create a function shape_area, which will calculate area of square, rectangle and a triangle. Override of the function should be controlled using the number of variables. In the main function you should demonstrate examples for all three cases of the shapes.

Answer 1

Here is how you define the functions.  Now you just need to write the main function.

double shape_area(double a) { return a * a; }
// now that we have defined this we can't make one for:
// - a circle that takes a radius

double shape_area(double a, double b) { return a * b; }
// now that we have defined this we can't make one for:
// - a triangle that takes a base and a height
// - an ellipse that takes a major axis and a minor axis

double shape_area(double a, double b, double c) {
    double s = (a + b + c) / 2.0;
    return sqrt(s * (s - a) * (s - b) * (s - c));
}
// now that we have defined this we can't make one for:
// - any other calculation that takes three inputs