数组名、指针和地址

首先看这个：

#include <stdio.h>
#include <iostream>
using namespace std;

int main() {
    int a[2] = {1, 2};
    cout << "The address of int_array: " << endl;
    cout << a << " " << &a << endl << endl;
    
    double b[2] = {1.2, 1.3};
    cout << "The address of double_array: " << endl;
    cout << b << " " << &b << endl << endl;
    
    char c[2] = {'a', 'b'};
    cout << "The address of char_array: " << endl;
    cout << c << " " << &c << endl << endl;
    
    int d[5] = {1, 2, 3, 4, 5};
    int dd[5] = {6, 7, 8, 9, 0};
    int j = 2, k = 1, i = 3;
    cout << d[i] << " " << i[d] << endl << endl;
    //this code is so strange, but in fact, d[i] = *(d + i) = *(i + d) = i[d].
    return 0;
}

#include <stdio.h>
int main() {
    int a[5] = {1, 2, 3, 4, 5};
    printf("a = %p\n", a);
    printf("&a = %p\n", &a);
    printf("a + 1 = %p\n", a + 1);
    printf("&a + 1 = %p\n", &a + 1);
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int a[5] = {305210130, 1164203589, 2023197048, 4, 5};//前三个数字在十六进制中表示分别是12312312、45645645、78978978，这样写主要为了测试方便
    int *ptr1 = (int *)(&a + 1);
    int *ptr2 = (int *)((int)a + 1);
    
    for (int i = 0; i < 20; i++) {//01
        cout << hex << *(int *)((int)a + i) << dec << ' ';
    }
    cout << endl << endl;
    
    
    cout << "&a + 1 : " << &a + 1 << endl;//02
    cout << "*(&a + 1) : " << *(&a + 1) << endl;//03
    cout << "**(&a + 1) : " << **(&a + 1) << endl;//04
    cout << "*(a + 5) : " << *(a + 5) << endl;//05
    cout << "(int *)(&a + 1) : " << (int *)(&a + 1) << endl;//06
    cout << "*((int *)(&a + 1)) : " << *((int *)(&a + 1))<< endl;//07
    cout << "*ptr1 : " << *ptr1 << endl;//08
    cout << "ptr1 : " << ptr1 << endl;//09
    cout << "ptr1[-1] : " << ptr1[-1] << endl;//10
    cout << "ptr1[-5] : " << ptr1[-5] << endl;//11
    cout << "(int)a : " << (int)a << endl;//12
    cout << "(int)a + 1 : " << (int)a + 1 << endl;//13
    cout << "(int *)((int)a + 1) : " << (int *)((int)a + 1) << endl;//14
    cout << "the address of a's first element : " << a << endl;//15
    cout << "*ptr2 : " << *ptr2 << endl;//16
    cout << "ptr2 : " << ptr2 << endl;//17
    cout << "the hex of *ptr2(*ptr2 = (int *)((int)a + 1)) : " << hex << *ptr2 << dec << endl;//18
    ptr2 = (int *)((int)a + 3);//19
    cout << "the hex of *ptr2(*ptr2 = (int *)((int)a + 3)) : " << hex << *ptr2 << dec << endl;//20
    
    return 0;
}