Arduinolator - An Arduino calculator

1#include <Keypad.h>
2#include   <LiquidCrystal.h>
3
4LiquidCrystal
5  lcd(0, 1, 2, 3, 4, 5);
6const byte ROWS = 4;
7const byte COLS = 4;
8
9char
10  keys [ROWS] [COLS] = {
11  {'1', '2', '3', '+'},
12  {'4', '5', '6', '-'},
13
14  {'7', '8', '9', '*'},
15  {'C', '0', '=', '/'}
16};
17byte rowPins[ROWS] =
18  {13,12,11,10};
19byte colPins[COLS] = {9,8,7,6};
20
21Keypad myKeypad = Keypad(
22  makeKeymap(keys), rowPins, colPins, ROWS, COLS );
23
24boolean presentValue =
25  false;
26boolean next = false;
27boolean final = false;
28String num1, num2;
29int
30  answer;
31char op;
32
33void setup()
34{
35  lcd.begin(16,2); //LCD starts
36
37  lcd.setCursor(0,0);
38  lcd.print("An Arduino"); //All this is text. You can
39  edit it
40  lcd.setCursor(0,1);
41  lcd.print("Calculator");
42  delay(3000);
43
44  lcd.clear();
45  lcd.setCursor(0,0);
46  lcd.print("The");
47  lcd.setCursor(0,1);
48
49  lcd.print("Arduinolator!");
50  delay(3000);
51  lcd.clear(); //LCD clears,
52  and you can begin using it. 
53}
54
55void loop(){
56
57  char key = myKeypad.getKey();
58
59
60  if (key != NO_KEY && (key=='1'||key=='2'||key=='3'||key=='4'||key=='5'||key=='6'||key=='7'||key=='8'||key=='9'||key=='0'))
61
62  {
63    if (presentValue != true)
64    {
65      num1 = num1 + key;
66      int
67  numLength = num1.length();
68      lcd.setCursor(15 - numLength, 0); //to adjust
69  one whitespace for operator
70      lcd.print(num1);
71    }
72    else 
73
74    {
75      num2 = num2 + key;
76      int numLength = num2.length();
77      lcd.setCursor(15
78  - numLength, 1);
79      lcd.print(num2);
80      final = true;
81    }
82  }
83
84
85  else if (presentValue == false && key != NO_KEY && (key == '/' || key == '*' ||
86  key == '-' || key == '+'))
87  {
88    if (presentValue == false)
89    {
90
91      presentValue = true;
92      op = key;
93      lcd.setCursor(15,0);
94
95      lcd.print(op);
96    }
97  }
98
99  else if (final == true && key != NO_KEY
100  && key == '='){
101    if (op == '+'){
102      answer = num1.toInt() + num2.toInt();
103
104    }
105    else if (op == '-'){
106      answer = num1.toInt() - num2.toInt();
107
108    }
109    else if (op == '*'){
110      answer = num1.toInt() * num2.toInt();
111
112    }
113    else if (op == '/'){
114      answer = num1.toInt() / num2.toInt();
115
116    }    
117      lcd.clear();
118      lcd.setCursor(15,0);
119      lcd.autoscroll();
120
121      lcd.print(answer);
122      lcd.noAutoscroll();
123  }
124  else if (key !=
125  NO_KEY && key == 'C'){
126    lcd.clear();
127    presentValue = false;
128    final
129  = false;
130    num1 = "";
131    num2 = "";
132    answer = 0;
133    op =
134  ' ';
135  }
136}
137

1#include <Keypad.h>
2#include   <LiquidCrystal.h>
3
4LiquidCrystal  lcd(0, 1, 2, 3, 4, 5);
5const byte ROWS = 4;
6const byte COLS = 4;
7
8char  keys [ROWS] [COLS] = {
9  {'1', '2', '3', '+'},
10  {'4', '5', '6', '-'},
11  {'7', '8', '9', '*'},
12  {'C', '0', '=', '/'}
13};
14byte rowPins[ROWS] =  {13,12,11,10};
15byte colPins[COLS] = {9,8,7,6};
16
17Keypad myKeypad = Keypad(  makeKeymap(keys), rowPins, colPins, ROWS, COLS );
18
19boolean presentValue =  false;
20boolean next = false;
21boolean final = false;
22String num1, num2;
23int  answer;
24char op;
25
26void setup()
27{
28  lcd.begin(16,2); //LCD starts
29  lcd.setCursor(0,0);
30  lcd.print("An Arduino"); //All this is text. You can  edit it
31  lcd.setCursor(0,1);
32  lcd.print("Calculator");
33  delay(3000);
34  lcd.clear();
35  lcd.setCursor(0,0);
36  lcd.print("The");
37  lcd.setCursor(0,1);
38  lcd.print("Arduinolator!");
39  delay(3000);
40  lcd.clear(); //LCD clears,  and you can begin using it. 
41}
42
43void loop(){
44
45  char key = myKeypad.getKey();
46
47  if (key != NO_KEY && (key=='1'||key=='2'||key=='3'||key=='4'||key=='5'||key=='6'||key=='7'||key=='8'||key=='9'||key=='0'))
48  {
49    if (presentValue != true)
50    {
51      num1 = num1 + key;
52      int  numLength = num1.length();
53      lcd.setCursor(15 - numLength, 0); //to adjust  one whitespace for operator
54      lcd.print(num1);
55    }
56    else 
57    {
58      num2 = num2 + key;
59      int numLength = num2.length();
60      lcd.setCursor(15  - numLength, 1);
61      lcd.print(num2);
62      final = true;
63    }
64  }
65
66  else if (presentValue == false && key != NO_KEY && (key == '/' || key == '*' ||  key == '-' || key == '+'))
67  {
68    if (presentValue == false)
69    {
70      presentValue = true;
71      op = key;
72      lcd.setCursor(15,0);
73      lcd.print(op);
74    }
75  }
76
77  else if (final == true && key != NO_KEY  && key == '='){
78    if (op == '+'){
79      answer = num1.toInt() + num2.toInt();
80    }
81    else if (op == '-'){
82      answer = num1.toInt() - num2.toInt();
83    }
84    else if (op == '*'){
85      answer = num1.toInt() * num2.toInt();
86    }
87    else if (op == '/'){
88      answer = num1.toInt() / num2.toInt();
89    }    
90      lcd.clear();
91      lcd.setCursor(15,0);
92      lcd.autoscroll();
93      lcd.print(answer);
94      lcd.noAutoscroll();
95  }
96  else if (key !=  NO_KEY && key == 'C'){
97    lcd.clear();
98    presentValue = false;
99    final  = false;
100    num1 = "";
101    num2 = "";
102    answer = 0;
103    op =  ' ';
104  }
105}
106