gcc - What does if((x=0)) mean in C? -

so apparently, in gcc/c, compiler compiles when

if ((x=0)){ code } 

is used, while when

if (x=0){ code } 

is used, compiler refuses compile.

what differences between two?

as note, know difference between x==0 , x=0. exploring how c behaves when met weird codes.

there no difference, code-wise.

all that's happening saying x=0 instead of x==0 such common mistake compilers emit warning (or error, in case) when see it. set of parentheses common trick shut compiler --- equivalent of saying 'yes, meant this'.