#include <stdio.h>


double f( char *s )      // f has return type double
{
   printf("%s\n", s);

   return (1);
}


int g( char *s )         // g has different return value
{
   printf("%s\n", s);

   return (1);
}

/* ----------------------------------------------------------------
   run has a function parameter of the form:

           void h( char * ) 

   Function f matches this function parameter declaration
   Function g does NOT match this function parameter declaration
   ---------------------------------------------------------------- */
void run( double h( char * ), char *a )
{
   h(a);
}


int main( int argc, char *argv[] )
{

   run( f, "Hello" );
   run( g, "Hello" );         // Error: argument 1 has wrong type !!!
}