什么是无符号数据类型? [英] what is the unsigned datatype?

问题描述

我见过这种 unsigned typeless" 类型使用过几次，但从未见过对它的解释.我想有一个相应的 signed 类型.举个例子:

I've seen this unsigned "typeless" type used a couple of times, but never seen an explanation for it. I suppose there's a corresponding signed type. Here's an example:

static unsigned long next = 1;
/* RAND_MAX assumed to be 32767 */
int myrand(void) {
    next = next * 1103515245 + 12345;
    return((unsigned)(next/65536) % 32768);
}
void mysrand(unsigned seed) {
    next = seed;
}

到目前为止我收集到的信息:
- 在我的系统上，sizeof(unsigned) = 4(提示 32 位无符号整数)
- 它可能用作将另一种类型转换为未签名版本的简写:

What I have gathered so far:
- on my system, sizeof(unsigned) = 4 (hints at a 32-bit unsigned int)
- it might be used as a shorthand for casting another type to the unsigned version:

signed long int i = -42;
printf("%u
", (unsigned)i);

这是 ANSI C 还是编译器扩展?

Is this ANSI C, or just a compiler extension?

推荐答案

unsigned 实际上是 unsigned int 的简写，因此在标准 C 中定义.

unsigned really is a shorthand for unsigned int, and so defined in standard C.

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