Thread: What is the diff. to write prototypes inside main() and before ??

1:

Code:

void function();

int main(void){
   return 0;
}

void function(){}

2:

Code:

int main(void){
   void function();
   return 0;
}

void function(){}

i've just seen this way...

what is the difference between 1 & 2?

and , ask one more , what is the advantage to write prototypes for functions ?? is it just clear to see all functions easily ??

thanks

To see the affects try compiling these two little programs

Code:

#include <stdio.h>

void foo(void);

int main(void)
{
  void bar(void);
  foo();
  return 0;
}

void foo (void)
{
  printf("Hello I'm in foo\n");
  bar();
}

void bar (void)
{
  printf("Hello I'm in bar\n");
}

Code:

#include <stdio.h>

void foo(void);
void bar(void);

int main(void)
{
  foo();
  return 0;
}

void foo (void)
{
  printf("Hello I'm in foo\n");
  bar();
}

void bar (void)
{
  printf("Hello I'm in bar\n");
}

oh ~~ i see , one is Global, one is not.

I saw some one write in the 2nd form. (he is not an expert); hehe!

ths

There are times when its not a bad idea to put the prototype inside a function to give it scope. But thats more of use for abstraction.