Quicklaunch/QuickLaunch/src/mod_calc/Calcmod.java

package mod_calc;

import java.io.IOException;
import java.util.ArrayList;

import javax.swing.JOptionPane;

import basics.BasicMod;

public class Calcmod extends BasicMod{
	ArrayList<Double> values;
	ArrayList<Character> operators;
	char current;
	String tmp;
	double output;
	double temp;
	public void init(){
		values = new ArrayList<Double>();
		operators = new ArrayList<Character>();
		 current = ' ';
		tmp = "";
		System.out.println("Calculator installed");
		this.setModName("Calculator");
		this.setVersion(0.81);
		
	}
	public void checkInput(String input) throws IOException {
		if(!input.isEmpty()){
			if(input.charAt(0)=='$'){
				for(int i = 1;i < input.length();i++){
					current = input.charAt(i);
					if(isAlternative(current)){
						current = changeAlternatives(current);
						System.out.println("alt");
					}
					if(isNumber(current)){
						tmp+= current;
						System.out.println("num");
					}
					else if(isOperator(current)){
						values.add(Double.parseDouble(tmp));
						tmp = "";
						operators.add(current);
						System.out.println("op");
					}
				}
				values.add(Double.parseDouble(tmp));
			}
		}
		solve();
		clear();
			
    }
	
	private boolean isNumber(char check){
		if((check == '1') ||
		   (check == '2') ||
		   (check == '3') ||
		   (check == '4') ||
		   (check == '5') ||
		   (check == '6') ||
		   (check == '7') ||
		   (check == '8') ||
		   (check == '9') ||
		   (check == '0') ||
		   (check == '.')){
			return true;
		}
		else{
			return false;
		}
	}   
	
	private boolean isOperator(char check){
		if((check == '+') ||
		   (check == '-') ||
		   (check == '*') ||
		   (check == '/')){
			return true;
		}
		else{
			return false;
		}
				
				
	}
	
	private boolean isAlternative(char check){
		if((check == ',') ||
		   (check == 'x')){
			return true;
		}
		else{
			return false;
		}
	}

	private char changeAlternatives(char check){
		if(check == ','){
			return '.';
		}
		else if(check == 'x'){
			return '*';
		}
		else{
			return '?';
		}
		
	}
	
	private void solve(){
		if(values.size() == operators.size()+1){
			 output = values.get(0);
			for(int i=0;i<operators.size();i++){
				 temp = values.get(i+1);
				if(operators.get(i) == '+'){
					output += temp;
				}
				else if(operators.get(i) == '-'){
					output -= temp;
				}
				else if(operators.get(i) == '*'){
					output *= temp;
				}
				else if(operators.get(i) == '/'){
					output /= temp;
				}
			}
			System.out.println(output);
			
			JOptionPane.showMessageDialog(null, output);
			
		}
	
	}
	
	private void clear(){
		values.clear();
		operators.clear();
		current = ' ';
		tmp = "";
		temp = 0;
		output = 0;
	}
}