Module4LabWeek2-BMICalc.cpp

//************************************************************************
// Author: Rolando Carreon
// Date: mar 27 2025
// Language: C++
// Assignment: Module 4 Lab Week 2 BMI Calculator
// Description: Program that calculates the Body Mass Index (BMI) using
//              user-defined functions.
//************************************************************************

#include<iostream>
using namespace std;

// function prototypes
void getWeightHeight(double&, double&);

double calcBMI(double, double);

string classifyBMI(double);

int main()
{
    // declare local variables
    double weight;     // parameter
    double height;     // parameter
    double BMI;        // returned from calcBMI
    string category;   // returned from classifyBMI
    
    // prompt user and obtain user weight and height
    getWeightHeight(weight, height);
    
   
    cout << "BMI Classification" << endl;
    
    // using user weight and height calculate BMI Score and save to main
    BMI = calcBMI(weight, height);
    
    // display BMI Score
    cout << "BMI: " << BMI << endl;

    // using BMI score, find and display category
    cout << "Classification: " << classifyBMI(BMI) << endl << endl;
    
    return 0;
}

// funciton definitions
// function to prompt user for weight and height, passes to main
void getWeightHeight(double& weight, double& height)
{
    cout << "Enter the weight in kilograms: ";
    cin >> weight;
    cout << "Enter the height in meters: ";
    cin >> height;
    cout << endl;
}

// calculates BMI score using BMI formula and returns to main
double calcBMI(double weight, double height)
{
    double BMI;

    BMI = weight / (height * height);
    return BMI;
}

// using calculated BMI score, return a category based on BMI rules
string classifyBMI(double BMI)
{
    string category;
    
    if (BMI < 18.5)
        category = "Underweight";
    else if (BMI >= 18.5 && BMI <= 25)
        category = "Normal weight";
    else if (BMI >= 25 && BMI <= 30)
        category = "Overweight";
    else
        category = "Obese";
    
    return category;
}