Difference between “int i=1,2,3” and “int i=(1,2,3)” - variable declaration with comma operator [duplicate]

Answer 1

It is the comma operator

i = a, b, c;            // stores a into i      ... a=5, b=2, c=3, i=5


i = (a, b, c);          // stores c into i      ... a=5, b=2, c=3, i=3

the differing behavior between the first and second lines is due to the comma operator having lower precedence than assignment.