Statement calculator

package softuni;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author SYSTEM
 */
public class SoftUni {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        DecimalFormat decFormat = new DecimalFormat("#.##");
        double result = 0;
        int expressionOperator = '+';
        BufferedReader bufferReader = new BufferedReader(new InputStreamReader(System.in));
        int symbol = bufferReader.read();
        while(symbol != '='){

        if(symbol == '('){
            double innerResult = 0;
            int innerOperator = '+';
            symbol = bufferReader.read();
            while(symbol != ')'){
                if(0 <= symbol - '0' && symbol - '0' <= 9){
                   switch(innerOperator){
                    case '+':
                      innerResult += symbol - '0';
                      break;
                    case '-':
                      innerResult -= symbol - '0';
                      break;
                    case '/':
                      innerResult /= symbol - '0';
                      break;
                    case '*':
                      innerResult *= symbol - '0';
                      break;
                    default:
                      System.out.println("something went wrong ://");
                      break;
                   }
                }
                else if(symbol == '+' || symbol == '-' || symbol == '/' || symbol == '*'){
                     innerOperator = symbol;
                }
                symbol = bufferReader.read();
            }
            result += innerResult;
        }
        else if(0 <= symbol - '0' && symbol - '0' <= 9){
            switch(expressionOperator){
                case '+':
                    result += symbol - '0';
                    break;
                case '-':
                    result -= symbol - '0';
                    break;
                case '/':
                    result /= symbol - '0';
                    break;
                case '*':
                    result *= symbol - '0';
                    break;
                default:
                    System.out.println("something went wrong ://");
                    break;
            }
        }
        else if(symbol == '+' || symbol == '-' || symbol == '/' || symbol == '*'){
            expressionOperator = symbol;
        }
        symbol = bufferReader.read();
       }

        System.out.println(decFormat.format(result));
    }

}