ejonesss:
while writing a program for my uno i found i can use 0 for low and 1 for high so eliminating 5 letters does not sound like much but take a blinking led for example that is 10 letters less you need to useso instead of
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a secondyou use
digitalWrite(13, 1); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, 0); // turn the LED off by making the voltage LOW
delay(1000); // wait for a secondit may be possible to use variables so you dont have to repeat so much.
That doesn't save code space, just space on your screen and makes the code harder to read.
HIGH and LOW are #define to 1 and 0. So before the compiler ever sees the code they get replaced and the code that goes to the compiler ends up looking just like what you wrote here.
It's instructions that matter to code size, not letters of text. Unless, of course, those letters are part of string variables. Instructions, not lines of code, remember that one line of code often translates to many many many machine instructions.