Error in my code but it compiled anyway? if ( 10 < pressDuration < 1000 )

Using Arduino Programming Questions
1

I wanted to check whether a value is in a certain range and I typed the following and it compiled and uploaded: if ( 10 < pressDuration < 1000 )

The functionality wasn't as expected and I figured the correct form is if ( 10 < pressDuration && pressDuration < 1000 ) but my question is, if what I did is invalid, why did it compile without an error? What is the compiler's interpretation of my invalid code?

2

It is not invalid, the compiler could make sense of it. However what the compiler thought it meant was not the same as you thought it meant.

I am guessing that the compiler first evaluated 10 < pressDuration into a logic true or false, and then compared that to see if this true or false was less than 1000.

1 Like
3

Yup.
1 (aka true) or 0 (aka false) is always less than 1000.

2 Likes
4

that's interesting -- never seen that during my career but AWOL summary explains it due to precedence

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