其次是无效是非法的

Followed By Void Is Illegal?

本文关键字：非法 无效      更新时间：2023-10-16

我有以下C++（它还没有真正做任何事情......

#include "stdafx.h"
#include <iostream>
using namespace std;
class Ranker 
{
    int up, down;
  public:
    void set_ranks(int, int);
    int rank(int, int, int, double);
}
void Ranker::set_ranks(int a, int b)
{
    up = a;
    down = b;
}
int _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}

当我运行它时，它会在 MS V C++ 中显示以下错误消息

1>------ Build started: Project: rankclass, Configuration: Debug Win32 ------
1>  rankclass.cpp
1>c:usersstudentdesktopsolomon w. c++rankclassrankclassrankclass.cpp(17): error C2628: 'Ranker' followed by 'void' is illegal (did you forget a ';'?)
1>c:usersstudentdesktopsolomon w. c++rankclassrankclassrankclass.cpp(18): error C2556: 'Ranker Ranker::set_ranks(int,int)' : overloaded function differs only by return type from 'void Ranker::set_ranks(int,int)'
1>          c:usersstudentdesktopsolomon w. c++rankclassrankclassrankclass.cpp(13) : see declaration of 'Ranker::set_ranks'
1>c:usersstudentdesktopsolomon w. c++rankclassrankclassrankclass.cpp(18): error C2371: 'Ranker::set_ranks' : redefinition; different basic types
1>          c:usersstudentdesktopsolomon w. c++rankclassrankclassrankclass.cpp(13) : see declaration of 'Ranker::set_ranks'
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

这是为什么...排名器后面不跟着空?!?!

Ranker声明后缺少分号。

它应该是：

class Ranker 
{
    int up, down;
  public:
    void set_ranks(int, int);
    int rank(int, int, int, double);
};  // <--- Note semicolon

类定义后跟一个分号，在第 12 行添加一个。

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