#include <stdio.h>

int f( float x );       // Declare f !!

int main( int argc, char *argv[])
{
   short a = 2;
   int   b;

   b = f( a );  

   printf("a = %d, b = %d\n", a, b);
}

int f( float x )
{
   return(x*x);
}