c- structure initialization

最新推荐文章于 2025-10-12 13:38:53 发布

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本文探讨了如何在一个头文件中定义数据结构，并在另一个头文件中进行初始化。通过使用预处理器指令，实现高效的数据组织与操作。示例代码展示了如何在源文件中声明并实例化已定义的数据结构。

can define the data structure in one header, initialize in another one

can include header files like this or include both headers in source file without including test_define.h in test_ini.h. but extern instance in source file in required since you have defined it during initialization

// test_define.h

#include <stdint.h>
                         
typedef struct a_s     
{
    uint8_t num1;
    uint16_t num2;
}a_t;

//  test_init.h

#include "test_define.h"
                         
a_t a1 = {
    .num1 = 2,
    .num2 = 3
};

// test.c

#include <stdio.h>
#include "test_init.h"

extern a_t a1;

int main() {
    printf("a1.num1 = %d, num2 = %d\n", a1.num1, a1.num2);
    return 0;
}  // main end