Head First C 读书笔记（二）

来源：互联网发布：java输入整数异常编辑：程序博客网时间：2024/05/16 19:53

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 arrayvoid (*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。

0 0