Question

每当我输入不同的情况并输入符合if语句要求的小时时，其他人也会被打印出来，帮助我只需要从每种不同的情况中输出一个。以下示例是我得到的错误。例如：输入'a'输入'11'输出'到期金额为11.95''到期金额为9.95'

//Libraries
#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;

//Global Constants

//Functioning Prototypes

//Execution Begins here
int main(int argc, char *argv[]){
//Declare Variables
char pack;
int hours;
float due;

//prompt user
cout<<"Please choose one monthly internet subscription package: a, b, or c\n";
cin>>pack;
cout<<"Enter how many hours were that month used\n";
cin>>hours;

//process 
cout<<setprecision(2)<<fixed<<showpoint;
switch (pack){

    case 'a':
        if (hours>=10 && hours<=744){
            hours=(hours-10)*2;
            due=hours;
            due+=9.95;
            cout<<"The amount due is $"<<due<<endl;
        }
        else if (hours>=744){
                cout<<"ERROR: a month cannot exceed 744 hours\n";
        }
        else ( hours<=10);{
            due=9.95;
            cout<<"The amount due is $"<<due<<endl;
        }
        break;
    case 'b':
        if (hours>20 && hours<744){
            hours=(hours-20);
            due=hours;
            due+=14.95;
            cout<<"The amount due is $"<<due<<endl;
        }
        else if (hours>=744){
            cout<<"ERROR: a month cannot exceed 744 hours\n";
        }
        else (hours<=20);{
            due=14.95;
            cout<<"The amount due is $"<<due<<endl;
        }
        break;
    case 'c':

        if (hours>=744){
            cout<<"ERROR: a month cannot exceed 744 hours\n";
        }
        else if (hours<744);{
            due=19.95;
            cout<<"The amount due is $"<<due<<endl;

        }
        break;
    }
system("PAUSE");
return 0;

}

Answer 1

else (hours<=20);{
        due=14.95;
        cout<<"The amount due is $"<<due<<endl;
    }

相当于：

else (hours<=20) {
//Do nothing
}

{
    due=14.95;
    cout<<"The amount due is $"<<due<<endl;
}

您需要删除“;”。否则，将始终执行最后一个代码块，因为它不是else块的一部分。

如果声明落在输出问题上

1 个答案: