Shell Programming and Scripting

$ cat foo.h
int add(int a,int b)
{
return(a+b);
}

$ cat main.c
#include<stdio.h>
#include"foo.h"
void main()
{
int number1=10,number2=10,number3;
number3 = add(number1,number2);
printf("Addition of Two numbers : %d\n\n",number3);
}

$ cat foo.awk

function add(a,b) {
        return(a+b)
}

$ cat main.awk

{ print add($1, $2) }

$ echo "1 2" | awk -f foo.awk -f main.awk

3

$

@include "foo.awk"
{ print add($1, $2) }

$ awk --version
GNU Awk 3.1.8
Copyright (C) 1989, 1991-2010 Free Software Foundation.

$ cat foo.awk
function add(a,b) {
        return(a+b)
}

$ cat main.awk
@include "foo.awk"
{ print add($1, $2) }

$ echo 1 2 | awk -f main.awk
awk: main.awk:1: @include "foo.awk"
awk: main.awk:1: ^ invalid char '@' in expression

$ cat main1.awk
@include foo.awk
{ print add($1, $2) }

$ echo "2 3" | igawk -f main1.awk
5

$ cat main.awk
@include "foo.awk"
{ print add($1, $2) }

$ echo "2 3" | awk -f main.awk
5