Question

我的布尔函数有问题。当我编译程序时，一切运行得很好，但是当我输入＆＃34; no＆＃34;它仍然说＆＃34;我可以帮助你什么？＆＃34;。

#include <iostream>
#include <string> //size()
#include <cctype> //isdigit()
using namespace std; //(xxx)xxx-xxxx

bool verification(string yesOrno)
{
    if(yesOrno == "yes")return(true);
    else               return(false);
}

int main()
{
    string yesOrno;

    cout <<"Do you need more help\n";
    cin >> yesOrno;

    if(!verification(yesOrno))cout <<"What can I help you with?\n";

    return(0);
}

Answer 1

Your logic is backwards - verification returns false for anything that isn't "yes". Since "no" isn't "yes", verification("no") returns false, and in the main function you print out this message if !verification("no"), which evaluates to true.

Seems like you should drop the ! operator from the if statement.

Answer 2

键入yes后会发生什么？发生什么事情是当你输入no时，它返回false。然后你将其反转（！）为真。它运行正常，但你正在翻转它，所以它不仅仅是“是”，它实际上适用于“是”的所有内容。

删除！（不是操作员），它将按预期工作。

布尔函数问题

2 个答案: