// Function to multiply a float by two
void multiplyByTwo(float &value) {
    value *= 2; // The original float is modified directly.
    Serial.print("value of the float inside 'multiplyByTwo': ");
    Serial.println(value);
}

void setup() {
    Serial.begin(115200);
    float myNumber = 10.5;
    Serial.print("Original value: ");
    Serial.println(myNumber); // Prints 10.5

    multiplyByTwo(myNumber);

    Serial.print("After multiplyByTwo: ");
    Serial.println(myNumber); // Prints 21.0
}

void loop() {
    // Nothing to do here.
    delay(10000);
}