Thread: operator precedence related question

here 2 programs

program 1

code:

#include<stdio.h>  int main()  {  int b=5;  int c= (b++)+(++b);  printf("%d",c);  }

the output of above

code:

12.

program 2

code:

#include<stdio.h>  int main()  {  int b=5;  int c= (b++) + (++b) + (++b) + (++b);   printf("%d",c);  }

the output of program 2

code:

27.

i took program 2 here logic has been explained not give output 29 on machine output 27.

same logic output of program 1 12.
seems correct.
want understand why in program2 output 27 , not 29.

i suspect running 'undefined behavior' territory.

code:

warning: operation on `b` may undefined [-wsequence-point]

read sequence points figure out what's going on here.

specifically, plus operator not sequence point, of (b++) or (++b) in statement can evaluated in order.

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