Does not understand fully

#1

does not understand the question fully

#2

@deepgarg46 Tell me the problem you’re facing in question.

#3
#4

@deepgarg46 Mention your problem.

#5 
public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	char ch = s.next().charAt(0);
	while ((ch != 'X') || (ch != 'x')) {

		int a, b, c;

		if (ch == '+') {
			a = s.nextInt();
			b = s.nextInt();

			c = a + b;
			System.out.println(c);
		}

		else if (ch == '-') {
			a = s.nextInt();
			b = s.nextInt();

			c = a - b;
			System.out.println(c);
		}

		else if (ch == '*') {
			a = s.nextInt();
			b = s.nextInt();

			c = a * b;
			System.out.println(c);
		} else if (ch == '/') {
			a = s.nextInt();
			b = s.nextInt();

			c = a / b;
			System.out.println(c);
		} else if (ch == '%') {
			a = s.nextInt();
			b = s.nextInt();

			c = a % b;
			System.out.println(c);
		} else if (ch != 'X'&&ch!='x') {
			System.out.println("Invalid operation. Try again.");
		} else {
			break;
		}

		ch = s.next().charAt(0);

	}
}

}

done sir

#6

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