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

问题描述

我已经看到了这个无符号无类型类型中使用了几次，但从来没有见过它的解释。我想有一个对应的签署键入。这里有一个例子：

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;
}

我迄今已收集：

- 我的系统上，的sizeof（无符号）= 4 （在32位无符号整型提示）

- 它可能被用作速记铸造另一类型的无符号版本

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\n", (unsigned)i);

这是ANSI C，或者只是一个编译器扩展？

Is this ANSI C, or just a compiler extension?

推荐答案

无符号真的是 unsigned int类型的简写，因此，在标准C定义。

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

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