Question

我正在循环中处理Switch语句。我想添加名称并为这些名称指定字母，然后根据字母打印出总值。问题是它不会读取字母的指定值，您可以在下面的代码中看到。例如，对于迈克，我指定了A，而A的值为10.对于Joe，我指定了B，而B的值为7.所以我需要A + B的总值乘以固定值3是51.我肯定做错了什么，并想知道是否可以在不使用对象和其他方法的情况下做到这一点。

import java.util.Scanner;
public class TotalScore {

public static void main(String[] args) {
    double lettervalue = 0,fixedvalue=3,totalvalue;
    int count,repeatcount;
    String valuename = "";
    String letter="";


Scanner input = new Scanner(System.in);
System.out.print("How many values do you want to process? ");
count=input.nextInt();
input.nextLine();

for(repeatcount=0;repeatcount<count;++repeatcount){

System.out.print("Enter name for value " +(repeatcount+1)+" ");
valuename = valuename+input.nextLine()+"\n";
System.out.print("Enter letter A,B,C or D for named value ");
letter = letter+input.nextLine()+"\n";


switch(letter){
    case "A":case"a": lettervalue=10.0;
        break;
    case "B":case"b": lettervalue=7.0;
        break;

    case "C":case"c": lettervalue=5.0;
        break;
    case "D":case"d": lettervalue=2.0;
        break;
    default: lettervalue=0;



}

}
totalvalue=lettervalue*fixedvalue;
System.out.println("The value names are\n "+valuename);
System.out.println("The letter values you entered are\n "+letter);
System.out.println("The total value is "+totalvalue);



}

}

Output:
How many values do you want to process? 2
Enter name for value 1 Mike
Enter letter A,B,C or D for named value A
Enter name for value 2 Joe
Enter letter A,B,C or D for named value B
The value names are
   Mike
   Joe

The letter values you entered are
   A
   B

The total value is 0.0

Answer 1

letter应该只包含您的输入值。然后你可以有一个单独的字符串来跟踪你的总输入。

String inputs = "";
String letter = "";

/*for loop etc.*/
letter = input.nextLine();

/*switch statement*/

inputs += valuename + letter + lettervalue + "\n";  //String.valueOf() is not necessary
totalvalue += lettervalue * fixedvalue;

/*end loop*/

System.out.println(inputs);

Answer 2

答案应该是这样的。

import java.util.Scanner;
public class TotalScore {

public static void main(String[] args) {
double lettervalue = 0,fixedvalue=3,totalvalue = 0.0;
int count,repeatcount;
String valuename = "";
String letter="";
String letters="";


Scanner input = new Scanner(System.in);
System.out.print("How many values do you want to process? ");
count=input.nextInt();
input.nextLine();

for(repeatcount=0;repeatcount<count;++repeatcount){

System.out.print("Enter name for value " +(repeatcount+1)+" ");
valuename = valuename+input.nextLine()+"\n";
System.out.print("Enter letter A,B,C or D for named value ");
letter = input.nextLine();
letters = letters+letter;

switch(letter){
case "A":case"a": lettervalue=10.0;
    break;
case "B":case"b": lettervalue=7.0;
    break;

case "C":case"c": lettervalue=5.0;
    break;
case "D":case"d": lettervalue=2.0;
    break;
default: lettervalue=0;



}
totalvalue=totalvalue + lettervalue*fixedvalue;
}

System.out.println("The value names are\n "+valuename);
System.out.println("The letter values you entered are\n "+letters);
System.out.println("The total value is "+totalvalue);

}

}

这应该是你要找的。

必须进行以下更改

1

totalvalue=totalvalue + lettervalue*fixedvalue;

2

moved the totalValue within the for loop

3

created a new variable letters to be the set of all the letters read.

切换循环以打印输出值

2 个答案: