How this code is printing 4 as output?

Question

#include <stdio.h>
int func(int a, int b, int c);
int main(void) {
int x;
x=func(2,3,4);
printf("%d\n",x);
return 0;}
int func(int a, int b, int c) {
return a, b, c; }

Answer 1

The comma operator evaluates all the operands and returns his rightmost evaluation.