Understanding post and pre increment with comma in between [duplicate]

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Category:Languages

Consider the below program

#include <stdio.h> void main(){     int p = -8;     int i = (p++, ++p);     printf("%d/n", i); } 

I am unable to get why the output is -6.

p++ would increment after the assignment statement is executed, ++p will increment before thereby making -8 to -7.

How i is assigned -6?

 


Because for a comma operator A,B then A is done first then B, and p++ increment the p, and ++p also increment the p. Operator precedence.

Or think like this

int i = (p++, ++p); 

is

p++; int i = ++p; 

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