Comma operator in c -


this question has answer here:

#include<stdio.h>  int main(void) {    int a=(1, 2), 3;     printf("%d", a);    return 0; }

output: 2
can 1 explain how output 2?

can 1 explain how output 2?

in statement 

a = (1, 2), 3;

, used comma operator. due higher operator precedence of = operator of , operator, expression operand (1, 2) bind = 

(a = (1, 2)), 3;

in case of comma operator, the left operand of comma operator evaluated void expression, right operand evaluated , result has value , type of right operand.

there 2 comma operators here. first comma operator in expression (1, 2), 1 evaluated void expression , 2 evaluated , assigned a.
side effect a has been taken place , therefore right operand of second comma operator 3 evaluated , value of expression (a = (1, 2)), 3 3.


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