Interview Hack#56 Answer

 What would be the output of the code? *

0

1

2

Can’t be determined

Correct answer

Can’t be determined

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Explanation:
It’s all about integer promotion. Data types like ‘char’, ‘short int’ are automatically promoted to ‘int’ when a calculation is performed on them. But even so, the expression (sizeof(b) == sizeof(a+b)) compare sizes not types and according to C standard, it’s guarantee that the size of ‘short int’ can’t be greater than size of ‘int’. Thus we can’t assure about what will ‘sizeof(a+b)’ will return therefore correct answer is ‘Can’t be determined’.
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Integer Promotion