Basic Calculator: Compilation error, not sure where it came from

#1

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#2 
public class BasicCalculator {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		char ch = sc.next().charAt(0);
		int res;
		do{
			if(ch == 'X' || ch == 'x'){
				break;
			}
			else if(ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '%')
			{
				int n1 = sc.nextInt();
				int n2 = sc.nextInt();
				
				switch(ch)
				{
				case '+':
					res = n1 + n2;
					System.out.println(res);
					break;
					
				case '-':
					res = n1 - n2;
					System.out.println(res);
					break;
					
				case '*':
					res = n1 * n2;
					System.out.println(res);
					break;
					
				case '/':
					res = n1 / n2;
					System.out.println(res);
					break;
					
				case '%':
					res = n1 % n2;
					System.out.println(res);
					break;
				}
				
			}
			else{
				System.out.println("Invalid operation. Try again.");
			}
		}
		while(ch != 'X' && ch != 'x');
		sc.close();
	}

}
#3

Hey @shatarupa2509_6702bcc43c339df9 There is slight silly mistake in your code which is you haven’t updated ch after the operation is executed that your ch is always ‘*’( for the sample test case) so you have to update ch after else statement like this :

else{
	System.out.println("Invalid operation. Try again.");
}
ch = sc.next().charAt(0);
#4

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