【CPP】数组名与指针

#include 
#include 

int main(int, char **)
{
    // 定义一个整形数组与指向数组的指针
    int arr[20];
    int *p = arr;

    // 打印数组名与指向数组的指针的地址
    printf("arr = %p\n", arr);
    printf("p   = %p\n", p);

    // 打印数组的长度与指向数组的指针的长度
    printf("sizeof(arr) = %lu\n", sizeof(arr));
    printf("sizeof(p)   = %lu\n", sizeof(p));

    // 数组名与指向数组的指针加一
    auto p1 = arr + 1;
    auto p2 = p   + 1;
    printf("p1 = %p\n", p1);
    printf("p2 = %p\n", p2);

    // 数组名与数组的地址
    auto p3 = arr;
    auto p4 = &arr;
    printf("p3 = %p\n", p3);
    printf("p4 = %p\n", p4);

    // 数组名与数组地址加一
    auto p5 = arr + 1;
    auto p6 = &arr + 1;
    printf("p5 = %p\n", p5);
    printf("p6 = %p\n", p6);

    // 数组与数组地址的类型
    printf("type name of  arr = %s\n", typeid(p5).name());
    printf("type name of &arr = %s\n", typeid(p6).name());

    // arr = 0x7ffe6a7c7860
    // p   = 0x7ffe6a7c7860
    
    // sizeof(arr) = 80
    // sizeof(p)   = 8
    
    // p1 = 0x7ffe6a7c7864
    // p2 = 0x7ffe6a7c7864
    
    // p3 = 0x7ffe6a7c7860
    // p4 = 0x7ffe6a7c7860
    
    // p5 = 0x7ffe6a7c7864
    // p6 = 0x7ffe6a7c78b0
    
    // type name of  arr = Pi
    // type name of &arr = PA20_i

    return EXIT_SUCCESS;
}
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