# include & ltstdio.h & gt
int Add(int a，int b)
{
Return (a+b);
}
Invalid master (invalid)
{
int(* p)()； //Define the function pointer
int a=4，b = 3；
P = add; //Point to the Add function, and pay attention to the unification of the return value.
printf("a+b=%d\n "，p(a，b))； //Call with function pointer
}