C++ char* 与 int*

char* 和 int* 有什么区别？

例如，当我运行此代码时：

#include<iostream>
using namespace std;


int main(){
  int a[3] = {10, 20, 30};
  int *ptr2a = &a[0];
  int i;
  char line[] = "Hello";
  char *ptr2line =  &line[0];

  for(i=0; i<3; i++){
    cout<<"Value of a["<<i<<"] is: "<<a[i]<<" same as "<<*(ptr2a+i);
    cout<<" Address is: "<<ptr2a+i<<" , same as "<<&a[i]<<endl;
  }

  for(i=0; i<strlen(line); i++){
    cout<<"Value of line["<<i<<"] is: "<<line[i]<<" same as "<<*(ptr2line+i);
    cout<<" Address is: "<<ptr2line+i<<" , same as "<<&line[i]<<endl;
  }

return 0;
}

我得到以下输出：

Value of a[0] is: 10 same as 10 Address is: 0x7fff5bf29b1c , same as 0x7fff5bf29b1c
Value of a[1] is: 20 same as 20 Address is: 0x7fff5bf29b20 , same as 0x7fff5bf29b20
Value of a[2] is: 30 same as 30 Address is: 0x7fff5bf29b24 , same as 0x7fff5bf29b24
Value of line[0] is: H same as H Address is: Hello , same as Hello
Value of line[1] is: e same as e Address is: ello , same as ello
Value of line[2] is: l same as l Address is: llo , same as llo
Value of line[3] is: l same as l Address is: lo , same as lo
Value of line[4] is: o same as o Address is: o , same as o

当我改变这一行时：

cout<<" Address is: "<<ptr2line+i<<" , same as "<<&line[i]<<endl;

至：

cout<<" Address is: "<<&ptr2line+i<<" , same as "<<&line[i]<<endl;

我得到了这个输出：

Value of line[0] is: H same as H Address is: 0x7fff5054bad0 , same as Hello
Value of line[1] is: e same as e Address is: 0x7fff5054bad8 , same as ello
Value of line[2] is: l same as l Address is: 0x7fff5054bae0 , same as llo
Value of line[3] is: l same as l Address is: 0x7fff5054bae8 , same as lo
Value of line[4] is: o same as o Address is: 0x7fff5054baf0 , same as o

在这种情况下，地址 0x7fff5054bad0 对应于 'Hello' 的值，0x7fff5054bad8 对应于 'ello' 等等。

创建存储字符串每个字符地址的指针的正确方法是什么？

解析度

可视化指针的一种方法是使用 printf 代替

printf("Value of line[%d] is: %c same as %c, Address is: %p, same as %p\n", i, line[i], *(ptr2line+i),ptr2line+i,&line[i]);

给出所需的输出

Value of line[0] is: H same as H, Address is: 0x7fff54ce6ade, same as 0x7fff54ce6ade
Value of line[1] is: e same as e, Address is: 0x7fff54ce6adf, same as 0x7fff54ce6adf
Value of line[2] is: l same as l, Address is: 0x7fff54ce6ae0, same as 0x7fff54ce6ae0
Value of line[3] is: l same as l, Address is: 0x7fff54ce6ae1, same as 0x7fff54ce6ae1
Value of line[4] is: o same as o, Address is: 0x7fff54ce6ae2, same as 0x7fff54ce6ae2

下面的@Daniel Jour 概述了另一种解决方案。