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#include <stdio.h>
 
typedef void* (*Fn) ();
 
int Fun()
{
return 5;
}
 
float fFun()
{
return 5.0;
}
 
 
void callfun(Fn f)
{
    printf ("%d \n", f());
}
 
void callffun(Fn f)
{
    printf ("%f \n", f());
}
 
 
 
int main()
{
 
callfun(Fun); // works
callffun(fFun); // --> doesnt work ??
printf ("%f", fFun()); // works
 
return 0;
}

prog.c: In function ‘callfun’:
prog.c:18:5: error: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘void *’ [-Werror=format]
prog.c: In function ‘callffun’:
prog.c:23:5: error: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘void *’ [-Werror=format]
prog.c: In function ‘main’:
prog.c:31:1: error: passing argument 1 of ‘callfun’ from incompatible pointer type [-Werror]
prog.c:16:6: note: expected ‘Fn’ but argument is of type ‘int (*)()’
prog.c:32:1: error: passing argument 1 of ‘callffun’ from incompatible pointer type [-Werror]
prog.c:21:6: note: expected ‘Fn’ but argument is of type ‘float (*)()’
cc1: all warnings being treated as errors

Standard output is empty