Class int Quiz

1. Which of the following example strings are valid integer literals?

1. 123
2. 123,456
3. 123.456
4. 0x4a5h
5. -123
6. 0b123
7. 0x123

Examples 1 and 7 are valid integer literals.
Example 2 is not valid because of the embedded comma.
Example 3 is not valid because of the embedded full-stop (but it is a valid real literal).
Example 4 is not valid because 'h' is not a valid hex digit.
Example 5 is not an integer literal, but can be parsed as the integer literal 123 preceded by the unary-minus operator.
Example 6 is not valid because 2 and 3 are not valid binary digits.

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2. In Perfect, what are (respectively) the values of (-10)/3 and (-10)%3 ?

1. -3 and -1
2. -3 and 1
3. -3 and 2
4. -4 and -1
5. -4 and 1
6. -4 and 2

Answer 6 is correct.
Evaluating -10/3 yields -4 because integer division rounds down towards minus infinity.
Evaluating -10%3 must give a result between 0 and (3 - 1); the actual answer is 2 because that is what is left over from -10 when you subtract 3 * -4.

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