GTU OOP Program - 13

13). Write a program for calculator to accept an expression as a string in which the operands and operator are separated by zero or more spaces. For ex: 3+4 and 3 + 4 are acceptable expressions.

import java.util.Scanner;

class Program_13 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter Expression : ");
        String string = input.nextLine();
        String expr = string.replaceAll(" ", "");

        if (expr.length() < 3) {
            System.out.println("Minimum 2 operands and 1 operator required");
            System.exit(0);
        }

        int result = 0;
        int i = 0;

        while (expr.charAt(i) != '+' && expr.charAt(i) != '-' && expr.charAt(i) != '*' && expr.charAt(i) != '/') {
            i++;
        }

        switch (expr.charAt(i)) {
            case '+':
                result = Integer.parseInt(expr.substring(0, i))
                        + Integer.parseInt(expr.substring(i + 1, expr.length()));
                break;
            case '-':
                result = Integer.parseInt(expr.substring(0, i))
                        - Integer.parseInt(expr.substring(i + 1, expr.length()));
                break;
            case '*':
                result = Integer.parseInt(expr.substring(0, i))
                        * Integer.parseInt(expr.substring(i + 1, expr.length()));
            case '/':
                result = Integer.parseInt(expr.substring(0, i))
                        / Integer.parseInt(expr.substring(i + 1, expr.length()));
                break;
        }
        System.out.println(expr.substring(0, i) + ' ' + expr.charAt(i) + ' ' + expr.substring(i + 1, expr.length())
                + " = " + result);
    }

}

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