Answer Posted / raje

just have ur function definition in one Cpp or C
file.....ie save it as .cpp or .C file....
then include the file as #include "program.c"
and then wherever you need call that functionin an another
program...
for example:
let me add my own ADDITION function in my library.....

this is my first file stored in .C....
int add(int a,int b)
{
int c;
c=a+b;
return c;
}
the file name for the above is add.c

then am opening my main program file in .c mode ....
#include<stdio.h>
#include<conio.h>
#include"add.c"
void main()
{
int a,b,c;
scanf("%d%d",&a,&b);
c=add(a,b);
printf("\n the added sum is :%d",c);
getch();
}

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