Objective-C Programming: The Big Nerd Ranch Guide

11 Structs

Sometimes you need a variable to hold several related chunks of data. In C, you can do this with a structure, commonly called a struct. Each chunk of data is known as a member of the struct.

For example, consider a program that computes a person’s Body Mass Index, or BMI. BMI is a person’s weight in kilograms divided by the square of the person’s height in meters. (BMI is a very imprecise tool for measuring a person’s fitness, but it makes a fine programming example.)

Create a new project: a C Command Line Tool named BMICalc. Edit main.c to declare a struct named Person that has two members: a float named heightInMeters and an int named weightInKilos. Then create two Person structs:

#include <stdio.h>

// Here is ...