Placing variables inside a function

Projects Programming
1

My understanding is that you always use the = sign when giving a variable a value.
The textbook that I am using does not do this.
The textbook code to make a diode blink 29 times is as follows:
const int ledPin = 13;
const int delayPeriod = 250;
void setup() {
pinMode (ledPin, OUTPUT);
}
void loop() {
flash (20, delayPeriod);
delay (3000);
}
void flash(int numFlashes, int d) {
for (int i=0; i < numFlashes; i++) {
digitalWrite (ledPi, HIGH);
delay (d);
digitalWrite (ledPin, LOW);
delay (d);
}
}

My problem is understanding why numFlashes and d are not given a value with an = sign.
Please help!

2

void flash(int numFlashes, int d) is a function with numFlashes and d as parameters.

When you call it with flash (20, delayPeriod);, the compiler assigns the values of 20 to numFlashes and delayPeriod to d "behind the scenes."

1 Like
3 
digitalWrite (ledPin, HIGH);
4

Many thanks

5

Thank you for your precise and clear explanation of my forum question,

Much appreciated,
Regards
Dave

6

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