我遇到了一些與我的程序輸出有關的問題。我確信錯誤是合乎邏輯的,但我只是無法解決它。錯誤應該在這裏某處錯誤輸出嵌套開關大小寫錯誤?
String plusorminus ="+-";
char mark = plusorminus.charAt(0);
char modifier = 0;
if(plusorminus.length() >= 1)
{
modifier = plusorminus.charAt(1);
}
/*This is my utility scanner,
* I created char grade to get the user input.
*/
java.util.Scanner input=new java.util.Scanner(System.in);
String userInputString = input.nextLine();
char grade = userInputString.charAt(0);
我不知道如何解決它。目前,如果我在程序中插入A +,它會給我A-的結果。下載我的完整代碼。
public class SwitchCase {
public static void main(String[] args) {
System.out.println("Please enter your grade (ex.A+) to get the mark range");
/*This block of codes converts from string to
* char and it gets the plus or minus sign
*/
String plusorminus ="+-";
char mark = plusorminus.charAt(0);
char modifier = 0;
if(plusorminus.length() >= 1)
{
modifier = plusorminus.charAt(1);
}
/*This is my utility scanner,
* I created char grade to get the user input.
*/
java.util.Scanner input=new java.util.Scanner(System.in);
String userInputString = input.nextLine();
char grade = userInputString.charAt(0);
/*This set of code contains the nested switch statements
* that i will use to output the correct mark range
* to the user. It also contains a try statement to find runtime
* errors in the program.
*/
try{
switch(grade)
{
case 'A':
switch(modifier)
{
case '+': System.out.println("Your grade is 90-99.99%"); break;
case '-': System.out.println("Your grade is 80-84.99%"); break;
default: System.out.println("Your grade is 85-89.99%"); break;
}
break;
case 'B':
switch(modifier)
{
case'+': System.out.println("Your grade is 77.00 - 79.99%"); break;
case'-': System.out.println("Your grade is 70.00 - 72.99%"); break;
default: System.out.println("Your grade is 73.00 - 76.99%"); break;
}
break;
case 'C':
switch(modifier)
{
case'+': System.out.println("Your grade range is 67.00 - 69.99%"); break;
case'-': System.out.println("Your grade range is 60.00 - 62.99%"); break;
default: System.out.println("Your grade range is 63.00 - 66.99%"); break;
}
break;
case 'D':
switch(modifier)
{
case'+': System.out.println("Your grade range is 55.00 - 59.99%"); break;
case'-': System.out.println("-"); break;
default: System.out.println("Your grade range is 50.00 - 54.99%"); break;
}
break;
case 'F':
switch(modifier)
{
default: System.out.println("Your grade range is 0.00-49.99%"); break;
}
break;
}
}
catch (java.util.InputMismatchException e) { //if the above error is met, message will be sent to the user
System.out.println("Please enter a valid grade!");
}
input.close(); //ends the user input
}
}
'modifier = plusorminus.charAt(1);'做什麼?它何時執行? – 2015-02-08 16:30:54
有沒有'E'級? – laune 2015-02-08 16:41:38