int array[10] =
{
[0 ... 9] = 0,
[8] = 8,
[2 ... 2] = 2,
[5 ... 7] = 5
};
int main()
{
int i = 0;
for (i = 0; i < 10; i++)
printf("%d/n", array[i]);
return 0;
}
Output:
0
0
2
0
0
5
5
5
8
0
再来个例子:
#include <stdio.h> struct StObErrorStringMap { const char *jdbc_state; const char *odbc_state; }; struct StObErrorStringMap arr[10] = { [0 ...9] = {(const char*)"HY000", (const char*)"S1000"}, [1] = { (const char*)"HY001", (const char*)"S1000" }, }; int main() { int i = 0; for (i = 0; i < 10; i++) printf("%s\n", arr[i].jdbc_state); return 0; }
可见,
1. gcc的数组初始化中,任意元素都能够被重复初始化,并且以最后一次初始化值为准。
2. 初始化单个元素的方法有两种 [index] = value, [index ... index] = value.
3. 实验表明,如果index超出了数组最大下标,编译器报错。
另外,c++中并不支持这个特性。替代方法:http://stackoverflow.com/questions/8167086/initializing-enum-indexed-array