triangles.cpp

#include<iostream>
#include<string>
using namespace std;

int triangleShape(int, int, int);

enum Triangle { SCALENE, ISOSCELES, EQUILATERAL, NO_TRIANGLE };

int main()
{
    int userS1,
        userS2,
        userS3;

    cout << "Please enter the length of all 3 sides of a triangle: " << endl;
    cout << "Side 1: ";
    cin >> userS1;
    cout << "Side 2: ";
    cin >> userS2;
    cout << "Side 3: ";
    cin >> userS3;

    int tri;
    tri = triangleShape(userS1, userS2, userS3);

    switch(tri)
    {
    case 0:
        cout << "\nThe triangle type is scalene.\n";
        break;
    case 1:
        cout << "\nThe triangle type is isosceles.\n";
        break;
    case 2:
        cout << "\nThe triangle type is equilateral.\n";
        break;
    case 3:
        cout << "\nThis is not a triangle.\n";
    }

    return 0;
}

int triangleShape(int side1, int side2, int side3)
{
    Triangle t;

    if (side1 == side2 && side2 == side3)
    {
        t = EQUILATERAL;
        return t;
    }
    else if (side1 == side2 && side2 != side3)
    {
        t = ISOSCELES;
        return t;
    }
    else if (side1 != side2 && side2 == side3)
    {
        t = ISOSCELES;
        return t;
    }
    else if (side1 != side2 && side2 != side3 && side1 != side3)
    {
        t = SCALENE;
        return t;
    }
    else
    {
        t = NO_TRIANGLE;
        return t;
    }
}