Need Help building Calculator

[Muzafar Ali]

Hello,
I am building a 4 functions calculator program, it is accepting a number then at next line an Arithmetic Operator then at another line another number then show calculation on only single operator.
i need help to modify it to accept data like this
12 + 12 - 2 * 2 = 20 as wel or
100 / 2 + 200 = 250 i mean it have to perform calculation from all four operators on single line or two or three

here is a program which is getting input like this
12
+
12
24
that i don't want.

import java.util.Scanner;

public class Calculator
{
	public static void main(String[] args)
	{
		Scanner scnr = new Scanner(System.in);
		
		char op;
		int number1, number2;
		int result;
		
		System.out.println("Enter Numbers");
		number1=scnr.nextInt();
		op=scnr.next().charAt(0);
		number2=scnr.nextInt();
		switch(op)
		{
		case '+':
			result = number1 + number2;
			System.out.println("Result is: "+result);
			break;
			
		case '-':
			result = number1 - number2;
			System.out.println("Result is: "+result);
			break;
			
		case '*':
			result = number1 * number2;
			System.out.println("Result is: "+result);
			break;
			
		case '/':
			result = number1 / number2;
			System.out.println("Result is: "+result);
			break;
			
			default:
				System.out.println("Wrong op!");
				break;
		}
	}
}

i shall wait for you answers !
if you have an example code for this pupose send me i will study from that.

regards,
Muzafar

[Eduardo Bueno]

Sorry but we are NotACodeMill. If you really did that code, you could easily do what you want just by looking at Scanner and String documentations.

[Muzafar Ali]

Eduardo Bueno wrote:Sorry but we are NotACodeMill. If you really did that code, you could easily do what you want just by looking at Scanner and String documentations.

I know sir you are not a code mil,
i don't say that correct it as i say, i say that provide me sample which could work like that i shall study on that and after that i shall use that code in my program, you say that use Scanner and String documentation i will follow that now i shall study on those .

Thanks,
Muzafar

[Campbell Ritchie]

If you are planning to use precedences, you need to look at a tutorial about parsing, convert the infix expression to postfix, and calculate in postfix.

[Kalabaw moo]

You could implement a stack data structure to your program for the operands and the operators including the "(" ")" parenthesis. It would be simpler to evaluate a postfix expression than to an infix expression.