1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* CalcBrain.m: Brain of Calculator.app
Copyright (C) 1999 Free Software Foundation, Inc.
Author: Nicola Pero <n.pero@mi.flashnet.it>
Date: 1999
This file is part of GNUstep.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <Foundation/Foundation.h>
#include <AppKit/AppKit.h>
#include "CalcBrain.h"
#include "CalcFace.h"
#include <math.h>
@implementation CalcBrain: NSObject
{
CalcFace *face;
double result;
double enteredNumber;
calcOperation operation;
int fractionalDigits;
BOOL decimalSeparator;
BOOL editing;
}
-(id) init
{
[super init];
result = 0;
enteredNumber = 0;
operation = none;
fractionalDigits = 0;
decimalSeparator = NO;
editing = YES;
face = nil;
return self;
}
-(void) dealloc
{
if (face)
[face release];
[super dealloc];
}
// Set the corresponding face
-(void) setFace: (CalcFace *)aFace
{
face = [aFace retain];
[face setDisplayedNumber: enteredNumber withSeparator: decimalSeparator
fractionalDigits: fractionalDigits];
}
// The various buttons
-(void) clear: (id)sender
{
result = 0;
enteredNumber = 0;
operation = none;
fractionalDigits = 0;
decimalSeparator = NO;
editing = YES;
[face setDisplayedNumber: 0 withSeparator: NO fractionalDigits: 0];
}
-(void) equal: (id)sender
{
switch (operation)
{
case none:
result = enteredNumber;
enteredNumber = 0;
decimalSeparator = NO;
fractionalDigits = 0;
return;
break;
case addition:
result = result + enteredNumber;
break;
case subtraction:
result = result - enteredNumber;
break;
case multiplication:
result = result * enteredNumber;
break;
case division:
if (enteredNumber == 0)
{
[self error];
return;
}
else
result = result / enteredNumber;
break;
}
[face setDisplayedNumber: result
withSeparator: (ceil(result) != result)
fractionalDigits: 7];
enteredNumber = result;
operation = none;
editing = NO;
}
-(void) digit: (id)sender
{
if (!editing)
{
enteredNumber = 0;
decimalSeparator = NO;
fractionalDigits = 0;
editing = YES;
}
if (decimalSeparator)
{
enteredNumber = enteredNumber
+ ([sender tag] * pow (0.1, 1+fractionalDigits));
fractionalDigits++;
}
else
{
enteredNumber = enteredNumber * 10 + ([sender tag]);
// Check overflow
if (enteredNumber > pow (10, 15))
{
[self error];
return;
}
}
[face setDisplayedNumber: enteredNumber withSeparator: decimalSeparator
fractionalDigits: fractionalDigits];
}
-(void) decimalSeparator: (id)sender
{
if (!editing)
{
enteredNumber = 0;
decimalSeparator = NO;
fractionalDigits = 0;
editing = YES;
}
if (!decimalSeparator)
{
decimalSeparator = YES;
[face setDisplayedNumber: enteredNumber withSeparator: YES
fractionalDigits: 0];
}
}
-(void) operation: (id)sender
{
if (operation == none)
{
result = enteredNumber;
enteredNumber = 0;
decimalSeparator = NO;
fractionalDigits = 0;
operation = [sender tag];
}
else // operation
{
[self equal: nil];
[self operation: sender];
}
}
-(void) squareRoot: (id)sender
{
if (operation == none)
{
result = sqrt (enteredNumber);
[face setDisplayedNumber: result
withSeparator: (ceil(result) != result)
fractionalDigits: 7];
enteredNumber = result;
editing = NO;
operation = none;
}
else // operation
{
[self equal: nil];
[self squareRoot: sender];
}
}
-(void) error
{
result = 0;
enteredNumber = 0;
operation = none;
fractionalDigits = 0;
decimalSeparator = NO;
editing = YES;
[face setError];
}
@end
|
