Question

因此，当我输入我想要使用的月份时，例如12月，我将722作为小时，程序会说，＆＃34;您输入的小时数不能超过一个小时内720＆＃34;。有办法解决吗？我不想做每个月的if语句，我觉得有一种更简单的方法。这也是我的第一个大学课程

int userPackage, userHours; //Declaring integer variables
double savings, savings2, total; //Declaring double value
string userMonth;
cout<<"\tHello.\nEnter the number of the package you have\n1) Package A\n2) Package B\n3) Package C\n"; //Prompts the user for their package in a menu like fashion
cin>>userPackage; //gets package
if(userPackage > 3 || userPackage < 1) //Error output for numbers that don't match packages
{
    cout<<"Error, invalid choice";
    return 0;
}

cout<<"Enter the number of hours you have been online."; //Propmts the user for the number of hours they've been online
cin>>userHours; //gets hours
cout<<"Enter the month (by name): ";
cin>>userMonth;
cout<<"\n";
if(userMonth == "January","March","May","July","August","October","December")
{
    if (userHours > 744)
    {
        cout<<"The amount of hours you entered cannot exceed the amount of hours within the month 744";
        return 0;
    }
}
if(userMonth == "April", "June", "September", "November");
{
    if(userHours > 720)
    {
        cout<<"The amount of hours you entered cannot exceed the amount of hours within the month 720";
        return 0;
    }
}
if(userMonth == "February");
{
    if (userHours > 672)
    {
        cout<<"The amount of hours you entered cannot exceed the amount of hours within the month 672";
        return 0;
    }   
}

Answer 1

if(userMonth == "January","March","May","July","August","October","December")

这不符合你的想法（即不比较userMonth到每个字符串。你可能想要写的语句（它假设你也想要）使用else if，即使您的代码没有：

if (userMonth == "January" ||
    userMonth == "March" ||
    userMonth == "July" ||
    userMonth == "August" ||
    userMonth == "October" ||
    userMonth == "December")
{
    ...
}
else if (userMonth == "April" ||
    userMonth == "June" ||
    userMonth == "September" ||
    userMonth == "November")
{
}
else if (userMonth == "February")
{
}

注意：这些也是区分大小写的比较（即＆＃34; 1月和＃34;不等同于＆＃34; 1月和＃34;或其他任何区别）和将所有东西转换为所有较低或全部上部套管可能更好。

if(userMonth == "April", "June", "September", "November");
// problematic trailing semi-colon ^

结束if语句，无条件执行下一个块。因此，当输入722时，始终大于720并且您会收到您正在查看的消息。

{＆2;＆＃34; 2月＆＃34; if逻辑中存在同样的错误同样。

此字符串比较不起作用

1 个答案: