InputMismatchException in test cases given by the platform-CodePudding

The error looks like the below and the test cases are given by platform it self, and also when i give custom case 419 A, then the output is 2365 but the expected output is 2366. someone provide the mistakes i done in the program.

Exception in thread main java.util.InputMismatchException
        at java.util.Scanner.throwFor(Scanner.java:864)
        at java.util.Scanner.next(Scanner.java:1485)
        at java.util.Scanner.nextInt(Scanner.java:2117)
        at java.util.Scanner.nextInt(Scanner.java:2076)
        at Solution.main(Solution.java:7)

The code is

  import java.util.Scanner;
  class Solution {

      public static void main(String args[]) {
           Scanner s = new Scanner(System.in);
           char grade = s.next().charAt(0);
           int basic = s.nextInt();
           double hra = (basic*20)/100;
           double da = (basic*50)/100;
           double pf =(basic*11)/100;
           int allow;
           if (grade == 'A'){
               allow = 1700;
           }
           else if (grade == 'B'){
               allow = 1500;
           }
           else {
               allow = 1300;
           }
           double total= basic hra da allow-pf;
           int ans = (int) Math.round(total);
           System.out.println(ans);
       }
   }

what could be the reason for that the exception error? And what changes are required to get excepted output?

CodePudding user response：

If you are providing 419 A as the input, then the problem is that the input doesn't match the program's expectations.

The code is written to expect a string followed by a number.

           Scanner s = new Scanner(System.in);
           char grade = s.next().charAt(0);   // reads a string
           int basic = s.nextInt();           // reads a number

But you say in the question that you are running it with input that is a number followed by a string. And the stacktrace is consistent with you doing that.

Either the input or the program is incorrect. Solution: fix whichever of those that is incorrect.

CodePudding user response：

There's no exception handling in your program. Line 7 calls s.nextInt(), which throws an InputMismatchException if the next token doesn't look like an integer (see the docs).

So, you need to catch the exception and take appropriate action if that happens.