Arduino calculator in Proteus!

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// By HomeMade Electronics
// Subscribe to my channel ua-cam.com/channels/8isJR_71x1wIfw6jB106pg.html
// Visit website sirboatengonline.com for more tutorial videos
// Like, share, and leave a comment if you need help. Thank you!
#include
#include // Download the Keypad library from github.com/Chris--A/Keypad
const byte ROWS = 4;
const byte COLS = 4;
// Define the Keymap
char keys[ROWS][COLS] = {
{'7', '8', '9', 'D'},
{'4', '5', '6', 'C'},
{'1', '2', '3', 'B'},
{'*', '0', '#', 'A'}
};
byte rowPins[ROWS] = {A0, A1, A2, A3};
byte colPins[COLS] = {10, 9, 8, 7};
Keypad kpd = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
long Num1, Num2, Number;
char key, action;
boolean result = false;
void setup() {
lcd.begin(16, 2);
lcd.print(" Uno Calculator");
lcd.setCursor(0, 1);
lcd.print(" HomeMade Tech ");
delay(2000);
lcd.clear();
}
void loop() {
// Store pressed key value in a char container
key = kpd.getKey();
if (key != NO_KEY)
DetectButtons();
if (result == true)
CalculateResult();
DisplayResult();
}
void DetectButtons() {
lcd.clear();
if (key == '*') {
Number = Num1 = Num2 = 0;
result = false;
}
if (key == '1') {
Serial.println("Button 1");
if (Number == 0)
Number = 1;
else
Number = (Number * 10) + 1; // If pressed twice
}
// Similar code for keys '4', '7', '0', '2', '5', '8', '3', '6', '9'
// Detecting Buttons on Column 4
if (key == 'A' || key == 'B' || key == 'C' || key == 'D') {
Num1 = Number;
Number = 0;
if (key == 'A') {
action = '+';
}
if (key == 'B') {
action = '-';
}
if (key == 'C') {
action = '*';
}
if (key == 'D') {
action = '/';
}
delay(100);
}
}
void CalculateResult() {
if (action == '+')
Number = Num1 + Num2;
// Similar code for '-', '*', '/'
}
void DisplayResult() {
// Set the cursor to column 0, line 1 and display the results
lcd.setCursor(0, 0);
lcd.print(Num1);
lcd.print(action);
lcd.print(Num2);
if (result == true) {
lcd.print(" =");
lcd.print(Number);
}
// Set the cursor to column 0, line 1 and display the result
lcd.setCursor(0, 1);
lcd.print(Number);
}

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