首页 > 代码库 > C语言 结构体作为参数和返回值使用
C语言 结构体作为参数和返回值使用
方案一:结构体变量作为参数,进行传值。
编译器需要拷贝,不影响origin value,使用成员操作符(.)直接访问
/*********************************************************************** 版权所有 (C)2017, Wang maochun。** 文件名称:travel.cpp* 文件标识:无* 内容摘要:主要演示结构体作为参数以及返回值 * 其它说明:"传值” * 当前版本:V1.0* 作 者:Wang maochun* 完成日期:2017.7.23***********************************************************************/#include <iostream>struct travel_time{ int hours; int mins;};const int Mins_per_hr = 60;travel_time sum(travel_time t1,travel_time t2);void show_time(travel_time t);int main(){ using namespace std; travel_time day1 = {5,45}; //5 hours 45 minutes travel_time day2 = {4,55}; //4 housr 55 minutes travel_time trip = sum(day1,day2); cout << "Two-day total:"; show_time(trip); travel_time day3 = {4,32}; cout << "Three-day total:"; show_time(sum(trip,day3)); return 0;}travel_time sum(travel_time t1,travel_time t2){ travel_time total; total.mins = (t1.mins + t2.mins) % Mins_per_hr; total.hours = (t1.hours + t2.hours) + (t1.mins + t2.mins) / Mins_per_hr; return total;}void show_time(travel_time t){ using namespace std; cout << t.hours << "hours," << t.mins << "minutes\n";}
运行结果:
方案二:结构体指针作为参数,传地址。
编译器不需要拷贝,和main函数采用相同地址。为了不影响origin value,使用const修饰
使用指针指向结构体操作符(->)间接访问
/*********************************************************************** 版权所有 (C)2017, Wang maochun。** 文件名称:travel.cpp* 文件标识:无* 内容摘要:主要演示结构体作为参数以及返回值 * 其它说明:"传地址” * 当前版本:V1.0* 作 者:Wang maochun* 完成日期:2017.7.23***********************************************************************/#include <iostream>struct travel_time{ int hours; int mins;};const int Mins_per_hr = 60;travel_time sum(travel_time* t1,travel_time* t2);void show_time(travel_time* t);int main(){ using namespace std; travel_time day1 = {5,45}; //5 hours 45 minutes travel_time day2 = {4,55}; //4 housr 55 minutes travel_time trip = sum(&day1,&day2); cout << "Two-day total:"; show_time(&trip); travel_time day3 = {4,32}; cout << "Three-day total:"; travel_time trip1 =sum(&trip,&day3); show_time(&(trip1)); return 0;}travel_time sum(travel_time* t1,travel_time* t2){ travel_time total; total.mins = (t1->mins + t2->mins) % Mins_per_hr; total.hours = (t1->hours + t2->hours) + (t1->mins + t2->mins) / Mins_per_hr; return total;}void show_time(travel_time* t){ using namespace std; cout << t->hours << "hours," << t->mins << "minutes\n";}
结果和方案一相同。
出现的错误:
show_time(&(sum(&day1,&day2)));这样写时,出现taking address of temporary fpermissive错误。
原因是:
Your middle result which is a temporary variable since it will disappear
If you assign the result of sum(&day1,&day2) to a variable then it will no longer be a temporary and you can then take the address of it.
因此,不能对未赋值的临时变量取地址
C语言 结构体作为参数和返回值使用
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。