Answer / vignesh1988i

it's simple.....

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();
}



thank u

Answer / ataraxic

Using ar utility.
Let's say we have lib1.c lib2.c and myprog.c
We want to do a library from lib1.c && lib2.c, and compile
myprog.c with this library afterwards.
The steps are:
Compile
1. gcc -c lib1.c -o lib1.o
2. gcc -c lib2.c -o lib2.o

Create archive named libmy.a
3. ar -rcsv libmy.a lib1.o lib2.o

Compile myprog with newly created lib
4. gcc myprog.c -L. -lmy -o myprog

Answer / 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();
}

Answer / ravi joshi

Do you mean funtion(s) in libc? if not, it is very simple.
Irrespective or static or dynamic, the library always
contains an executable code but not linked. When application
uses the library, the code is linked at application link
time or load time depending on whether the library is static
or dynamic respectively.

for adding function in a library, just add the new function
as if you are adding any other function and recompile it as
a library. When linked with application, the new function
will become useable.

Answer / vivek

By library its generally meant an executable library. In
which case one can write a wrapper for the existinig DLL.
This will ofcourse require one to know the function
prototype of all exported functions.

If its a static library then simple write another lib and
add the existing one of the libs to link against.

What is external and internal variables What is dynamic memory allocation what is storage classes in C

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