When this occurs, the least-significant bits of the larger integer are used to fill as many bits of the shorter integer type as possible. Integer Truncations occur when an integer is assigned or cast to an integer type with a shorter bit length.For example, the same 32-bit stream is used to represent both -1 and 4,294,967,295 - casting between signed and unsigned integers can result in a drastic change in interpreted value. Signed/Unsigned Mismatch In the Two's Compliment System, the bitstreams that represent a negative signed integer correspond to a very large unsigned integer.Integer casts can be subdivided into context-specific scenarios: The interpreted value can be significantly different than the original value. When this occurs, the bitstream of the source integer is interpreted as if it were the destination integer type. Integer Casts occur when an integer of one type is interpreted as another. When an integer underflow occurs, the interpreted value will wrap around from the minimum value to the maximum value for its integer type. Integer Underflows occur when the result of an arithmetic operation is smaller than the minimum value of the destination integer type. Integer Overflows are closely related to other conditions that occur when manipulating integers: However, this value exceeds the maximum for this integer type, so the interpreted value will “wrap around” and become -128. If a programmer stores the value 127 in such a variable and adds 1 to it, the result should be 128. When an integer overflow occurs, the interpreted value will appear to have “wrapped around” the maximum value and started again at the minimum value, similar to a clock that represents 13:00 by pointing at 1:00.įor example, an 8-bit signed integer on most common computer architectures has a maximum value of 127 and a minimum value of -128. An Integer Overflow is the condition that occurs when the result of an arithmetic operation, such as multiplication or addition, exceeds the maximum size of the integer type used to store it.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |