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package projekt;
1		package projekt;
2
3		import java.util.Scanner;
4
5		public class Main {
6
7		static Stack<Operator> operator;
8		static Stack<Double> operand;
9		static Scanner sc=new Scanner(System.in);
10		static String string;
11
12
13		public static void main (String[] args){
14		operator=new Stack<Operator>();
15		operand=new Stack<Double>();
16		System.out.println("Skriv in ditt tal");
17		string=sc.nextLine();
18
19		String[] in=string.split(" ");
20		tilldela(in);
21		System.out.println(operand.pop());
22
23
24		}
25
26		public static void tilldela(String[] lista){
27		for(String s: lista){
28		switch(s){
29
30		case "+":
31		new Plus().hantera(operator, operand);
32		break;
33
34		case "-":
35		new Minus().hantera(operator, operand);
36		break;
37
38		case "*":
39		new Multi().hantera(operator, operand);
40		break;
41
42		case "/":
43		new Division().hantera(operator, operand);
44		break;
45
46		case "(":
47		new VParantes().hantera(operator, operand);
48		break;
49
50		case ")":
51		break;
52		default:
53		operand.push(Double.parseDouble(s));
54		break;
55		}
56
57		}
58
59
60		}
61		}
62
63
64
65
66		package projekt;
67
68		public class Plus extends Operator {
69
70		@Override
71		public int prioritet() {
72		// TODO Auto-generated method stub
73		return 2;
74		}
75
76		@Override
77		public void evaluera(Stack<Double> operand) {
78		double ett=operand.pop();
79		double två=operand.pop();
80		operand.push((ett+två));
81
82		}
83
84		@Override
85		public void hantera(Stack<Operator> operator, Stack<Double> operand) {
86		while(operator.empty()!=true&&((Operator) operator.top()).prioritet()>=this.prioritet()){
87		((Operator) operator.pop()).evaluera(operand);
88		}
89
90		operator.push(this);
91
92		}
93
94		}
95
96
97
98		package projekt;
99
100		public class HParantes extends Operator{
101
102		@Override
103		public int prioritet() {
104		// TODO Auto-generated method stub
105		return 0;
106		}
107
108		@Override
109		public void evaluera(Stack operand) {
110		// TODO Auto-generated method stub
111
112		}
113
114		@Override
115		public void hantera(Stack operator, Stack operand) {
116		while(operator.empty()!=true&&((Operator) operator.top()).prioritet()!=3){
117		((Operator) operator.pop()).evaluera(operand);
118		}
119		operator.push(this);
120		}
121
122		}