Differerent outputs in VSCode vs Prutor

Asked Apr 16 '21 at 14:08

Active Apr 16 '21 at 17:30

Viewed 22 times

I tried using the following C code:

int a=1,b=3;
printf("a : %d \n b : %d\ncond : %d\na : %d\nb : %d",a, b, ((a=b++)==0),a,b);
return 0;

I get different outputs in VSCode and Prutor(which is used in my college)

VSCode Output:

a : 3
b : 4
cond : 0
a : 3
b : 4

Prutor Output:

a : 1
b : 3
cond : 0
a : 3
b : 4

PS I feel that Prutor output is correct

edited Apr 16 '21 at 17:30

rioV8

asked Apr 16 '21 at 14:08

Curious_To_Know

1

Two words: sequence point – anastaciu Apr 16 '21 at 14:11
Lack thereof I mean. – anastaciu Apr 16 '21 at 14:12
Why can't *both* be correct? – Scott Hunter Apr 16 '21 at 14:13
1

In addition to the lack of sequence point, the order of evaluation of the parameters is not specified. – Eugene Sh. Apr 16 '21 at 14:14
1

@ScottHunter Or both be incorrect? Or neither, as "correct" and "incorrect" is undefined here – Eugene Sh. Apr 16 '21 at 14:15
I don't know Prutor, but VSCode is no compiler at all. Comparing the result is not very useful. – Gerhardh Apr 16 '21 at 15:18
1

Does this answer your question? [Why are these constructs using pre and post-increment undefined behavior?](https://stackoverflow.com/questions/949433/why-are-these-constructs-using-pre-and-post-increment-undefined-behavior) – Gerhardh Apr 16 '21 at 15:19

0 Answers0