UGC NET CSE | June 2009 | Part 2 | Question: 15

Question

What is the value of $‘b’$ after the execution of the following code statements :

$C=10;$

$B=++c + ++c;$

• A. $20$                 
• B. $22$       
• C. $23$                 
• D. None

Comments

none. Undefined behavior

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Ans is 24

Answer 1

It will give compilation error .

Answer 2

23 is the answer

Case 1:

c=10;

b= ++c + ++c;

Then, b=11 + ++c (as ++c means 1st increment and then assignment, so c+1=10+1=11)

Then b= 11 + 12 (same as above)

So, b=23

Case 2:

c=10;

b= ++c++ +c;

Then, ++c means c value(10) at 1st increment then assignment , so 11 (++c) will get added to the value of c after c++ operation

Again c++ means 1st assignment then increment

After increment(i.e., c++), c =12

Now b=11+12 =23

Comments

you are wrong...it will give error or undefined behavior

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Why the case 2 is wrong? Please explain