[英]Initializing only one member in a C struct for an array of struct elements
I have the following code with an intention to initialize member b. 我有以下代码旨在初始化成员b。 This should happen for all the MAX_SIZE structs.
所有MAX_SIZE结构都应该发生这种情况。
enum { MAX_SIZE = 10 };
struct some
{
int a, b;
}
many[MAX_SIZE] = { {.b = 5} };
int main()
{
int i;
for (i = 0; i < MAX_SIZE; i++)
{
printf("%d, %d\n", many[i].a, many[i].b);
}
}
I need the output to look like: 我需要输出看起来像:
0, 5
0, 5
0, 5
... (10 times)
But, the actual output is: 但是,实际输出为:
0, 5
0, 0
0, 0
... (10 times)
How to get the required output without requiring an explicit for loop for assigning the values? 如何在不需要显式for循环来分配值的情况下获得所需的输出? I know in C++, this is accomplished by providing a constructor for the struct initializing b only.
我知道在C ++中,这是通过仅为初始化b的结构提供构造函数来实现的。
It's not C Standard, but with this gcc extension you can do this : 它不是C Standard,但是通过gcc扩展,您可以执行以下操作:
struct some many[10] = { [0 ... 9].b = 5 };
It works with clang >= 5
too. 它也适用于
clang >= 5
。
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