When might you encounter a problem with integer overflow?
什么时候可能会遇到整数溢出问题？

Question

When might you encounter a problem with integer overflow? 
什么时候可能会遇到整数溢出问题？

BlackTom AI · Accepted Answer

This question asks about scenarios that cause integer overflow. We'll evaluate each option to see whether it could lead to overflow.

Option 1: 'When trying to store an integer value as a double' — This does not cause overflow of an int variable. Converting or storing an integer value into a double might widen the representation without overflow for typical ranges, since doubles have much larger range and can represent integers exactly up to a limit. The issue here is a type conversion, not overflow of an int.

Option 2: 'When trying to store an integer which is too big to be stored in an int variable' — This is the classic overflow scenario. If the integer value exceeds the maximum (or minimum) value that an int type can hold, the stored value wraps around or triggers overflow behavior depending on the language, leading to incorrect results.

Option 3: 'When trying to store a decimal number in an int variable' — A decimal (floating-point) number cannot be represented exactly in an integer type, but this typically results in truncation or rounding, not overflow. The problem here is narrowing conversion, not overflowing the storage capacity of an int.

Option 4: 'When trying to divide one integer by another using ints when the answer should be a decimal value' — This is about integer division semantics (truncation toward zero) rather than overflow. Overflow could occur in rare edge cases during division (e.g., dividing the minimum negative value by -1 in two's complement systems), but the primary and most general overflow scenario described in this context is storing a too-large integer in an int.

Option 5: 'When trying to print an int in the middle of a String' — This concerns formatting/output, not overflow. Printing does not change the value stored in the int or cause overflow.

In summary, the statement that correctly identifies overflow is Option 2, which describes attempting to store a value that exceeds the int type’s capacity. The other options involve type conversion behaviors, rounding, or formatting that do not constitute overflow of the integer storage.

(862646) AP CS A Unit 1 Exam 第一单元考试

When might you encounter a problem with integer overflow? 什么时候可能会遇到整数溢出问题？

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