public class Main {
	
	public Main(){
		
		
		float res = calc(formula);
		
		System.out.println("Result is equal to: " + res);
		
	}
	
	String formula = "7 - 5 + 3 - 2 - 3";
	
	float calc(String formula){
	
		
		formula = formula.replaceAll("\\s+", "");
		
		Func root = null;
		
		System.out.println(formula);
		
		for(int i = formula.length() - 1; i > 0; i--){
			if(formula.charAt(i) == '+'){
				System.out.println("Create root addition: " + formula);
				String a = formula.substring(0, i);
				String b = formula.substring(i + 1, formula.length());
				System.out.println(a + ":" + b);
				root = new Func(Func.OP_TYPE.ADDITION, a, b);
				break;
			} else if(formula.charAt(i) == '-'){
				System.out.println("Create root subtraction: " + formula);
				String a = formula.substring(0, i);
				String b = formula.substring(i + 1, formula.length());
				root = new Func(Func.OP_TYPE.SUBTRACTION, a, b);
				break;
			}
		}
		
		System.out.println("ONP");
		root.printONP();
		System.out.println("\n");
		
		return root.calc();
	}
	
	public static void main(String[] args){
		System.out.println("PROGRAM START");
		
		new Main();
		
		System.out.println("PROGRAM END");
	}
}