|
1
9 package org.nfunk.jep.function;
10
11 import java.util.*;
12 import org.nfunk.jep.*;
13 import org.nfunk.jep.type.*;
14
15 public class Subtract extends PostfixMathCommand
16 {
17 public Subtract()
18 {
19 numberOfParameters = 2;
20 }
21
22 public void run(Stack inStack)
23 throws ParseException
24 {
25 checkStack(inStack);
27 Object  param2 = inStack.pop();
28 Object param1 = inStack.pop();
29
30 inStack.push(sub(param1, param2));
31
32 return;
33 }
34
35 public Object sub(Object param1, Object param2)
36 throws ParseException
37 {
38 if (param1 instanceof Complex)
39 {
40 if (param2 instanceof Complex)
41 {
42 return sub((Complex)param1, (Complex)param2);
43 }
44 else if( param2 instanceof Number )
45 {
46 return sub((Complex)param1, (Number )param2);
47 }
48 }
49 else if (param1 instanceof Number )
50 {
51 if (param2 instanceof Complex)
52 {
53 return sub((Number )param1, (Complex)param2);
54 }
55 else if (param2 instanceof Number )
56 {
57 return sub((Number )param1, (Number )param2);
58 }
59 }
60 throw new ParseException("Invalid parameter type");
61 }
62
63
64 public Double sub(Number d1, Number d2)
65 {
66 return new Double (d1.doubleValue() - d2.doubleValue());
67 }
68
69 public Complex sub(Complex c1, Complex c2)
70 {
71 return new Complex(c1.re() - c2.re(), c1.im() - c2.im());
72 }
73
74 public Complex sub(Complex c, Number d)
75 {
76 return new Complex(c.re() - d.doubleValue(), c.im());
77 }
78
79 public Complex sub(Number d, Complex c)
80 {
81 return new Complex(d.doubleValue() - c.re(), -c.im());
82 }
83 }
84 |
Popular Tags |
Java API By Example, From Geeks To Geeks.