Header files allow programmers to separate elements of a program's source code into reusable files. They commonly contain forward declarations of classes, subroutines, variables, and other identifiers. To create a header file, a new file is made from the main toolbar and given a .h extension. An example shows a calc.h header file that declares an int calc function and is then included and used in a main.cpp file to add two numbers.

2. String Functions in C
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3. Header File
Header File is a file that allows
programmers to separate certain
elements of a program's source code into
reusable files. Header files commonly
contain forward declarations of classes,
subroutines, variables, and other
identifiers.

4. Steps in Header File Creation
1. File->New->Project...

5. 2. Main Toolbar->New file (button)->File...

6. Example
#ifndef CAL_H_INCLUDED
#define CAL_H_INCLUDED
int calc (int a, int b)
{
int add;
add=a+b;
return (add);
}
#endif

7. #include <iostream>
#include "cal.h"
using namespace std;
int main()
{
int a,b,add;
cout<<"Enter Two numbersn";
cin >>a>>b;
add=calc(a,b);
cout<<"sum="<<add<<endl;
}

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