Chapter 4 – #5: Body Mass Index – Tony Gaddis – Starting Out With C++

>_ Problem

Write a program that calculates and displays a person’s body mass index (BMI). The BMI is often used to determine whether a person with a sedentary lifestyle is overweight or underweight for his or her height. A person’s BMI is calculated with the following formula:

BMI = weight x 703 / height^2

where weight is measured in pounds and height is measured in inches. The program should display a message indicating whether the person has optimal weight, is underweight, or is overweight. A sedentary person’s weight is considered to be optimal if his or her BMI is between 18.5 and 25. If the BMI is less than 18.5, the person is considered to be underweight. If the BMI value is greater than 25, the person is considered to be overweight.

>_ Solution

#include <iostream>
#include <cmath>    // Included for using pow() function.
using namespace std;

int main()
    // Variables
    float BMI, 

    // Ask user for height & weight
    cout << "Enter weight(in pounds): " << endl;
    cin >> weight;

    cout << "Enter height(in inches, e.g. 5' 9\" = 69): " << endl;
    cin >> height;

    // Calculate & display the person's (BMI)
    BMI = weight * (703 / pow(height, 2));

    // Display BMI
    cout << "BMI = " << BMI << endl;

    // Decision Structure
    if (BMI >= 18.5 && BMI <= 25)
        cout << "Weight optimal." << endl;
    else if (BMI >= 0 && BMI <= 18.5)
        cout << "Weight underweight." << endl;
    else if (BMI >= 25)
        cout << "Weight overweight." << endl;

    // Terminate program
    return 0;

>_Get The Book

Tony Gaddis’ book “Starting Out with C++ from Control Structures to Objects”: 8th and 9th editions.

>_ Video Walk Through

This video includes a step by step process of how I solve programming challenge #5.

>_That’s it!

Thank you for taking interest in what I do! I hope it was helpful for you as much as it helped me along my journey in learning to code!

>_ Also Check Out:

Tag: Starting Out With C++ | Chapter 4 | Programming Challenge Solutions

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