Integer types smaller than int are promoted when an operation is performed on them. If all values of the original type can be represented as an int, the value of the smaller type is converted to an int; otherwise, it is converted to an unsigned int (see INT02-C. Understand integer conversion rules). If the conversion is to a wider type, the original value is zero-extended for unsigned values or zero-extended for signed types. Arithmetic operations performed on ints yield the same values as on chars and shorts (at least in the low-order bits). However, bitwise operations may have unexpected results..
Noncompliant Code Example
This noncompliant code example demonstrates how performing bitwise operations on short types can result in unexpected behaviorinteger types smaller than int may have unexpected results.
| Code Block | ||
|---|---|---|
| ||
uint8_t port = 0x5aU; uint8_t result_8 = ( ~port ) >> 4; |
...