CS256 - Principles of Structured Design Fall 2021

Displaying ./code/cs256su21code/jul12/struct.c

/*

defining a simple struct

structs are similar to arrays, but a struct may contain data of different 
data types. Each element of data in the struct is named in the same way 
individual variables are.

So a struct can be thought of as a collection of variables under one name

*/


#include <stdio.h>


//we define structs outside and above of main

//typedef is a keyword that allows us to rename datatypes

//the typedef keyword here will allow us to give our 
//struct a single variable name, so we can declare it 
//just like a regular variable in main 
typedef struct stuff {

	int a, b;

}thing;

//above, we have a struct named stuff, that has just two integers
//with the typedef keyword, we named the datatype for our struct "thing"

int main(){

	int x = 3;
	thing y; //declaring a variable that uses our new struct as a datatype
			 // without the typedef statement, we'd need to type in "struct stuff y"
			 // to do what we just did above
	
	y.a = 4; //to access a member of our struct to set a variable to something
			 // we use the format variable.member to do this

			//in that case, we're setting variable y dot member a to 4,

	y.b = 10;

	printf("Struct stuff a = %d, b = %d\n", y.a, y.b);


	return 0;
}