How to use the pushbutton without using if, else

Question

I want to let the led blink for 3 seconds then 2 seconds then one second using the button one time and without using if/else

void setup() {
 // put your setup code here, to run once: 
 pinMode(5, INPUT); 
 pinMode(6, OUTPUT);
} 
void loop() { 
 // put your main code here, to run repeatedly: 
 digitalRead(5, HIGH);
 digitalWrite(6, HIGH); 
 delay(3000);
 digitalWrite(6, LOW);
 digitalWrite(6, HIGH); 
 delay(2000); 
 digitalWrite(6, LOW); 
 digitalWrite(6, HIGH); 
 delay(1000); 
}

• chrisl: Why don't you want to use if/else? Or is this a school assignment?
• Sam Abdul: it is a school assignment actually
• ElectronSurf: switch case is your friend ;)
• GMc: Switch is an alternative to if --- unless are you at the "interrupts" section of your class...
• GMc: @FilipFranik I agree and did not advocate that. You definitely don't want to include any lengthy operations in an interrupt service routine. My comment was more of a suggestion that switch is an obvious alternative to using an if - but it is also possible that the OP was at the "interrupts" section of their class and thus would require a completely different approach to the serial code as posted in the question - and as you suggest, definitely should not be using delay. Hopefully that was also taught in the class... I should perhaps in hindsight been more clear in my original comment.

Answer 1

As the required operation is finite and short, you can just hard code the sequence.

Answer 2

You could you simple inversion of boolean variable to set state of LED.

const int LedPin = 5;
bool ledState = true;
// in your loop
// bool will be transformed from true to 1 (HIGH)
digitalWrite(LedPin, (int)ledState);
// invert LED state to be false
ledState = !ledState;
// false -> 0 (LOW)
digitalWrite(LedPin, (int)ledState);

Answer 3

Ternary operator maybe helpful. [Reference]

• sempaiscuba: While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes.