Discussion: Files with .h extension are called header files in C. These header files generally contain function declarations which we can be used in main C program, like for e.g. to include stdio.h in C program to use function printf() Exercise 1. C-Program to Create your own Header File Step 1 : Type this Code int add(int a,int b) { int sum; sum= a+b; return sum; } In this Code write only the function definition as you write in General C Program Step 2 : Save Code Save Above Code with [.h ] Extension . Let the name of our header file be myhead [ myhead.h ] Compile Code if required. Step 3 : Write Main Program #include #include"myhead.h" int main() { int num1 = 10, num2 = 10, num3; num3 = add(num1, num2); printf("Addition of Two numbers : %d", num3); } Instead of writing < myhead.h>; use this terminology “myhead.h” All the Functions defined in the myhead.h header file are now ready for use . Directly call function add(); [ Provide proper parameter] Note: While running your program: Both files [ myhead.h and sample.c ] should be in the same folder. (Source: http://www.c4learn.com/c-programs/how-to-create-your-own-header-file-in-c.html)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Discussion: Files with .h extension are called header files in C. These header files generally contain function declarations which we can be used in main C program, like for e.g. to include stdio.h in C program to use function printf()

Exercise 1. C-Program to Create your own Header File

Step 1 : Type this Code

int add(int a,int b)

{

int sum;

sum= a+b;

return sum;

}

In this Code write only the function definition as you write in General C Program

Step 2 : Save Code

Save Above Code with [.h ] Extension .

Let the name of our header file be myhead [ myhead.h ]

Compile Code if required.

Step 3 : Write Main Program

#include<stdio.h>

#include"myhead.h"

int main() {

int num1 = 10, num2 = 10, num3;

num3 = add(num1, num2);

printf("Addition of Two numbers : %d", num3);

}

Instead of writing < myhead.h>; use this terminology “myhead.h”
All the Functions defined in the myhead.h header file are now ready for use .
Directly call function add(); [ Provide proper parameter]

Note:

While running your program: Both files [ myhead.h and sample.c ] should be in the same folder.

(Source: http://www.c4learn.com/c-programs/how-to-create-your-own-header-file-in-c.html)

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