File Inclusion

This type of preprocessor directive tells the compiler to include a file in the source code program.

There are two ways of the file inclusion statement:
i) #include “file-name”
ii) #include <file-name>


• If the first way is used, the file and then the filename in the current working directory and the specified list of directories would be searched.
• If the second way, is used the file and then the filename in the specified list of directories would be searched.

Example

file name - file.c

#include<stdio.h>

#include "fact.h"

#include<conio.h>

int main()

{

int n,fact;

printf("Enter the value of n :");

scanf("%d",&n);

fact = factorial(n);

printf("\n Factorial of %d is %d",n,fact);

getch();

return 0;

}

File name - fact.h

#include<stdio.h>

int factorial (int n)

{

int i,f = 1;

for(i=1;i<=n;i++)

{

f = f * i;

}

return f;

}

Output

Enter the value of n : 6

Factorial of 6 is 120