Why this code give result 14 ?

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This code gives me result 14. But I hope that result will be 12. so Why did this program give me this result?

What I have tried:

#include <stdio.h>

int main()
{
int i = 5;
int a = ++i + ++i;
printf("%d",a);

return 0;
}

Posted 23-Feb-22 20:33pm

Fardin Khan_451

Updated 23-Feb-22 21:49pm

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3 solutions

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OriginalGriff · Accepted Answer · 2022-02-23T21:49:00

Solution 3

See here: Why Does x = ++x + x++ Give Me the Wrong Answer?[^]

Posted 23-Feb-22 21:49pm

OriginalGriff

_Asif_ · Accepted Answer · 2022-02-23T21:05:00

Solution 2

You can find more elaboration from c - Why are these constructs using pre and post-increment undefined behavior? - Stack Overflow[^]

Posted 23-Feb-22 21:05pm

_Asif_

Patrice T · Accepted Answer · 2022-02-23T20:57:00

Quote:
This code gives me result 14. But I hope that result will be 12.

This code:

C++

int a = ++i + ++i;

is in a gray zone, this means that the result is unpredictable and will depend on how it is handled by compiler. Result can be 12, 13 or 14.
Advice: Never do multiple increment/decrement on same variable in a formula.