Number of arguments mismatch in function call

[Sulabh Nangalia <sulabh.nangalia@xxxxxxxxx>]

Hi,

I have a question with function definition.
Please consider following 3 different forms
of writing a same test example:

1.
static int foo(i, j)
  int i;
  float j;
{
  return i;
}
int main()
{
  return foo(1);    // Passing less arguments
}

2.
static int foo(int, float);
static int foo(i, j)
  int i;
  float j;
{
  return i;
}
int main()
{
  return foo(1);    // Passing less arguments
}
test.c: In function 'main':
test.c:10: error: too few arguments to function 'foo'

3.
static int foo(int i, float j)
{
  return i;
}
int main()
{
  return foo(1);    // Passing less arguments
}


I am using gcc version 4.1.2 to compile all the 3 variations as:
% gcc test.c


The first one compiles fine.
While the 2nd & 3rd give following error:
test.c: In function 'main':
test.c:7: error: too few arguments to function 'foo'

Can someone please explain if this is a bug of gcc
or a desired behavior and why?

-- 
Regards,
Sulabh Nangalia