// This file is part of nanocal.
//
// Copyright (C) 2022-2024 André Wobst <[email protected]>
//
// nanocal 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 3 of the License, or
// (at your option) any later version.
//
// nanocal 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 nanocal. If not, see <http://www.gnu.org/licenses/>.
#include "nanocal.h"
int number1, number2, result;
byte current_number;
char op;
void setup()
{
setup_nanocal();
lcd.print("Hello, world!");
delay(3000);
lcd.clear();
lcd.cursor();
number1 = 0;
current_number = 1;
}
void loop()
{
char key;
byte digit;
key = keypad.getKey();
if (key) beep_key();
switch (key) {
case '\0':
break;
case 'A':
case 'B':
case 'C':
case 'D':
switch (key) {
case 'A':
op = '+';
break;
case 'B':
op = '-';
break;
case 'C':
op = '*';
break;
case 'D':
op = '/';
break;
}
lcd.print(op);
number2 = 0;
current_number = 2;
break;
case '*':
lcd.clear();
lcd.cursor();
number1 = 0;
current_number = 1;
break;
case '#':
lcd.print('=');
switch (op)
{
case '+':
result = number1 + number2;
break;
case '-':
result = number1 - number2;
break;
case '*':
result = number1 * number2;
break;
case '/':
result = number1 / number2;
break;
}
lcd.setCursor(0, 1);
lcd.print(result);
lcd.noCursor();
break;
default:
lcd.print(key);
digit = (int)key-48;
if (current_number == 1) {
number1 = 10*number1 + digit;
} else {
number2 = 10*number2 + digit;
}
}
}