The Command Table

Implement a table-driven calculator: ``c /* runs the named binary command: "add", "sub", "mul". Returns the result, or INT_MAX for an unknown name. */ int calc(const char *name, int a, int b); /* returns the number of registered commands */ size_t calc_count(void); /* returns 1 if name is registered, 0 otherwise */ int calc_has(const char *name); `` The dispatch table must be data (an array the functions walk) — no strcmp if-chains inside calc.