What is !0 in C?

user_355682 0
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I know that in C, for if statements and comparisons FALSE = 0 and anything else equals true.

Hence,

int j = 40
int k = !j

k == 0 // this is true

My question handles the opposite. What does !0 become? 1? 

int l = 0
int m = !l

m == ? // what is m?
boolean c
5 Answers

!x will be expand to (x==0) so:

  • if x=0 -> !x take value from (0==0) = TRUE (value 1)
  • if x!=0 -> !x take value from (x==0) = FALSE (value 0)
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