Merging of two programs

[bp04]

Hey,
I am using borland c compiler. I want to merge two existing program in one program.
Can we merge two programs together ?? Can any tell me the solution for these ??

[bp04]

first program
#include<stdio.h>
int main(void) {
while(1) {
led_on();
for(int i = 0; i < 0xffff; i++);
led_off();
for(int i = 0; i < 0xffff; i++);
}
return 0;
}
Second program
#include<stdio.h>
int main(void)
{
printf("Welcome!!");
return 0;
}

[shadder]

Third program:

#include<stdio.h>
int main(void) {
printf("Welcome!!");
while(1) {
led_on();
for(int i = 0; i < 0xffff; i++);
led_off();
for(int i = 0; i < 0xffff; i++);
}
return 0;
}

PS : plese use code tags
http://www.cplusplus.com/articles/jEywvCM9/

[bp04]

And what if i have functions to be merged too.
Will the functions be add in a main file or in the header files??

[shadder]

Well you can add them in main file as well as header files (I am assuming user defined header files)