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- if (Serial.available()) {
- char letter = Serial.read();
- while (!Serial.available());
- int number = String(char(Serial.read())).toInt();
- switch (letter) {
- case 'A':
- Serial.println(int(number * number));
- break;
- case 'B':
- if (number != 0) {
- Serial.println(int(number / number));
- } else {
- Serial.println("The result is undefined");
- }
- break;
- case 'C':
- Serial.println(int(number + number));
- break;
- case 'D':
- Serial.println(int(number - number));
- break;
- default:
- Serial.println("Unrecognized command!");
- break;
- }
- }
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