C语言部分初始化一个结构体

最新推荐文章于 2024-04-09 22:42:00 发布

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本文探讨了C语言中结构体的初始化过程，特别是在部分初始化时的行为。通过一个具体示例，展示了当仅初始化结构体的部分成员时，未被显式初始化的成员将被默认设置为零。此外，文章还提到了编译器警告选项-Wno-missing-field-initializers，用于忽略字段未初始化的警告。

https://stackoverflow.com/questions/10828294/c-and-c-partial-initialization-of-automatic-structure

In C, objects are never partially initialised - if any part of them is initialised, the entire object (and all sub-objects recursively) are initialised. If no explicit initialiser is provided then elements are initialised to "zero of the appropriate type".

CFLAGS += -Wno-missing-field-initializers

example:

#include <stdio.h>                                                                                                                                                 
struct position {
    int x;
    int y;
    int z;
};
int main() {
    struct position point = {1,2};
    printf("x=%d, y=%d, z=%d\n", point.x, point.y, point.z);
}