Question

I need to write a class in C++.

I need to make a class that uses measurements of a triangle and outputs its area.

It needs to have the following things.

variables the hold the base and height, and those should be doubles for precision.

Member functions to get and set the variables from part one and that check to ensure the values entered are greater than zero. If the values are incorrect, the function must prompt the user for a new value and keep doing so until a valid value is given.

I need another member function that returns the area of the triangle.

There also needs to be a non-member function, main to run the program.

The output should be like this:

What is the height of the triangle in meters? -1

That is an invalid height, please try again. 1

What is the length of the base in meters? 1

The area of the triangle is 0.5 m^2

Answer 1

#include <iostream>
using namespace std;

class triangle {
private:
    double base, height;
public:
    double getBase() const {
        return base;
    }

    void setBase(double base) {
        while (base <= 0) {
            cout << "That is an invalid length, please try again. ";
            cin >> base;
        }
        this->base = base;
    }

    double getHeight() const {
        return height;
    }

    void setHeight(double height) {
        while (height <= 0) {
            cout << "That is an invalid height, please try again. ";
            cin >> height;
        }
        this->height = height;
    }

    double area() {
        return 0.5 * base * height;
    }
};

int main() {
    triangle t;
    double b, h;
    cout << "What is the height of the triangle in meters? ";
    cin >> h;
    t.setHeight(h);
    cout << "What is the length of the base in meters? ";
    cin >> b;
    t.setBase(b);
    cout << "The area of the triangle is " << t.area() << " m^2" << endl;
    return 0;
}