函数指针：
type (*name)(parameter types)
调用： name(parameter)
函数指针数组：
type (*name[])(parameter types) = { };
使用函数指针数组简化程序——分手信自动生成器：
#include <stdio.h> enum response_type {DUMP, SECOND_CHANCE, MARRIAGE}; typedef struct { char *name; enum response_type type; }response; void dump (response r) { printf("Dear %s, \n", r.name); puts("Unfortunately your last date contacted us to..."); } void second_chance(response r) { printf("Dear %s, \n", r.name); puts("Good news: your last date has asked us to..."); } void marriage(response r) { printf("Dear %s, \n", r.name); puts("Congratulations! Your last date has contacted..."); } // function pointer array void (*replies[])(response) = {dump, second_chance, marriage}; int main() { response r[] = { {"Mike", DUMP}, {"Luis", SECOND_CHANCE}, {"Matt", SECOND_CHANCE}, {"William", MARRIAGE} }; int i; for(i=0; i<4; i++) (replies[r[i].type])(r[i]); }
程序中本来需要使用 switch 语句对枚举类型进行判断后才能调用函数，但是这里用函数指针数组不需要判断，直接调用了对应的函数。
