Can you point out my faults

#1
#2

@Utkarshsingh5298291,

Simply Put a loop and take input operator and then take input of two digits and then perform the operation till the user inputs ‘x’ or ‘X’.

    public static void main(String[] args) {
        char ch;
        do {
            ch = scn.next().charAt(0);  
            if (ch == '+' || ch == '-' || ch == ' * ' || ch == '/' || ch == '%') {
// Do Arithmetic operations here
            } else {
                if (ch != 'x' && ch != 'X')
                    System.out.println("Invalid operation. Try again.");
            }
        } while (ch != 'x' && ch != 'X');
    }
#3

Thankyou !! but why we have used && operator instead of || .

#4

@Utkarshsingh5298291,
Where exactly? Can you mention the line?

#5

while(n!=‘X’ && n!=‘x’);

#6

@Utkarshsingh5298291,
n should not be equal to X and x, only then we have to print try again. If n = X or x ,we need to exit the loop and terminate the program