sign unsign
时间: 2024-06-10 18:08:41 浏览: 14
signed和unsigned用于修饰整数类型,signed表示有符号,unsigned表示无符号。有符号数的最大取值要比无符号的小约一半,因为有符号数的最高一位被用来表示符号。默认的int、short、long、long long为有符号数;换言之,int等价于signed int,short等价于signed short,long等价于signed long,long long等价于signed long long。但是char本身是signed char还是unsigned char,取决于语言的实现(编译器)。
unsigned int与int运算的时候,int会被转化为unsigned int来进行运算。这个规则可能是由于unsigned int可以表示更大的正值而定的。但是有些人认为这个规则不符合直觉,因为我们一般不会将unsigned想象成一个负数。
下面是一些常见整数类型的取值范围:
- signed char :[-2^7, 2^7) 即 [-128, 128)
- unsigned char:[0, 2^8) 即 [0, 256)
- signed n位整数:[-2^(n-1), 2^(n-1))
- unsigned n位整数:[0, 2^n)
相关问题
unsigned int
An unsigned integer is a data type in computer programming that represents a non-negative whole number. It is often abbreviated as "unsigned int" or "uint" and is commonly used to store values that do not require a sign (positive or negative).
The range of an unsigned integer depends on the number of bits used to store it. For example, an unsigned 8-bit integer can store values from 0 to 255, while an unsigned 32-bit integer can store values from 0 to 4,294,967,295.
Since unsigned integers do not allow negative numbers, they can be used to store values such as counts, sizes, or indexes. They are widely used in programming languages such as C and C++.
unsigned char
Unsigned char is a data type in programming languages, which holds an integer value between 0 and 255. It is a one-byte variable that doesn't have a sign bit, meaning it only stores positive values. The use of unsigned char is common in many applications such as image processing, data compression, and cryptography. It is often used to represent pixel values in images or to store binary data.
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