linux gcc 结构体对齐

#include <stdio.h>

// 定义一个结构体
struct Example {
    char a;    // 1字节
    int b;     // 4字节
    short c;   // 2字节
};

// 使用GCC属性指定对齐方式
struct ExampleAligned {
    char a;
    int b;
    short c;
} __attribute__((aligned(8)));

int main() {
    struct Example ex;
    struct ExampleAligned exAligned;

    printf("Size of Example: %zu\n", sizeof(struct Example));
    printf("Address of ex.a: %p\n", (void*)&ex.a);
    printf("Address of ex.b: %p\n", (void*)&ex.b);
    printf("Address of ex.c: %p\n", (void*)&ex.c);

    printf("Size of ExampleAligned: %zu\n", sizeof(struct ExampleAligned));
    printf("Address of exAligned.a: %p\n", (void*)&exAligned.a);
    printf("Address of exAligned.b: %p\n", (void*)&exAligned.b);
    printf("Address of exAligned.c: %p\n", (void*)&exAligned.c);

    return 0;
}