Test Case Failed.(Basic Calculator)

#1

My code runs well,but it fails 3 test cases out of 6.
please help me to resolve this problem?

#2

Hi Ajith,
Save your code on coding blocks ide and share a link to it.

#3

here ,this is my code

import java.util.Scanner;

public class Cal {

public static void main(String[] args) {

	Scanner s = new Scanner(System.in);
	char ch = s.next().charAt(0);
	while (ch != '+' && ch != '-' && ch != '*' && ch != '%' && ch != '/' && ch != 'x' && ch != 'X') {
		System.out.println("Invalid operation. Try again.");
		ch = s.next().charAt(0);
	}
	int c, a, b;
	switch (ch) {

	case '+':
		a = s.nextInt();
		b = s.nextInt();
		c = a + b;
		System.out.println(c);
		break;
	case '-':
		a = s.nextInt();
		b = s.nextInt();
		c = a - b;
		System.out.println(c);
		break;
	case '*':
		a = s.nextInt();
		b = s.nextInt();
		c = a * b;
		System.out.println(c);
		break;
	case '/':
		a = s.nextInt();
		b = s.nextInt();
		c = a / b;
		System.out.println(c);
		break;
	case '%':
		a = s.nextInt();
		b = s.nextInt();
		c = a % b;
		System.out.println(c);
		break;
	case 'X':
		break;
	case 'x':
		break;
	}
}

}

#4

Hi Ajith,
See in this question you have to put all the switch block in a loop while or do-while where test condition will be ch != ‘x’ && ch != ‘X’ and put a default case for the condition when the input operation is not +,-,%,/ and * and print Invalid operation.

#5

my code is giving an error like:
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 Main.main(Main.java:29)