请问下这是什么语法？

yylogo

C89 能通过?
真的吗? 我怎么记得这是C99的新东西?

vbs100

gcc --std=c89 是可以通过的 但这个功能好像真是c99才引进的

下面引自 c - in a nushell
8.3.2. Initializing Specific Elements
C99 has introduced element designators to allow you to associate initializers with specific elements . To specify a certain element to initialize, place its index in square brackets. In other words, the general form of an element designator for array elements is:
[constant_expression]

The index must be an integer constant expression. In the following example, the element designator is [A_SIZE/2]:
#define A_SIZE 20
int a[A_SIZE] = { 1, 2, [A_SIZE/2] = 1, 2 };

This array definition initializes the elements a[0] and a[10] with the value 1, and the elements a[1] and a[11] with the value 2. All other elements of the array will be given the initial value 0. As this example illustrates, initializers without an element designator are associated with the element following the last one initialized.
If you define an array without specifying its length, the index in an element designator can have any non-negative integer value. As a result, the following definition creates an array of 1,001 elements:
int a[ ] = { [1000] = -1 };

yylogo

为什么可以通过我不知道, 但是刚刚查了一下, 确实是C99的新功能`

yylogo

学习了, 还可以int a[] = {[1000] = -1};

Kallawa

动手试试不就知道了嘛～～ 呵呵

int main()
{
    int a[] = {
       [0] = 10,
       [1] = 1,
       [9] = 0
    };

    int i;
    for(i=0; i < 10; i++)
       printf("%d -- %d\n",i,a);

   return 0;
}

OwnWaterloo

原帖由 vbs100 于 2009-8-27 16:47 发表
gcc --std=c89 是可以通过的 但这个功能好像真是c99才引进的

gcc -std=c89 -pedantic

btw：
不小心点了2楼koolcoy一个臭蛋……  sorry啊

vbs100

原来如此啊 呵呵  多谢指点

koolcoy

还了你一个

OwnWaterloo

应该谢谢楼上这位报复心很强同学~~~
我也是从他的回帖子中看到这个选项的。

to koolcoy：
早知道不告诉你

koolcoy

原帖由 OwnWaterloo 于 2009-8-28 12:27 发表

to koolcoy：
早知道不告诉你

但是你已经告诉我了