Puzzle SL16

Will the following program compile? If so, what does it write to the monitor?

#include <stdio.h>
char a=8, b=9;

int g ( int x, int y);

int g( int a, int b )
{
  printf("scope g: a=%d   b=%d  \n", a, b );
}

int main ( void )
{
  g( 1, 2 ) ;
  printf("scope m: a=%d    b=%d\n", a, b );

  return 0 ;
}

The third non-blank line of the program is a function prototype, a declaration (but not a definition) of a function. In this program it is not needed, since the function definition follows immediately.

It does not hurt to have an unneeded prototype. Sometimes programmers put a prototype for every function in a file at the beginning of that file.