String pointer and char pointer Array

I. String pointer

A string is a special char array. A pointer to a char array is a string pointer. Like normal pointers, string pointers must be defined before use. The difference between a string and a char array is the length. The character is automatically appended with a length '\ 0' at the end, and the length of a char array is the number of characters. The string length is the number of characters plus 1. Example:

#include<iostream>using namespace std;int main(){    char str[]="hello world";    char *p=str;    cout<<str<<endl;    cout<<p<<endl;    cout<<*p<<endl;    system("pause");    }

2. Char pointer Array

The element of the pointer array is a pointer. Similar to a normal pointer, a pointer array must be assigned a value before use. Otherwise, it may point to meaningless values, which is dangerous. Take the char pointer array as an example.

int main(){    char *p[5]={"abc","def","ghi","jkl","mno"};    for(int i=0;i<5;i++)    puts(p[i]);    system("pause");    }

For int type data, see the following:

# Include <iostream> using namespace STD; int main () {int A = 1, B = 2, c = 3; int * P [] = {& A, & B, & c}; // cannot be written as int * P [] = {1, 2, 3}. This is invalid. Because p is first combined with [], it is a pointer array, and the data element of the array is int type pointer, not int type data. For (INT I = 0; I <3; I ++) cout <p [I] <Endl; // print out the address (pointer) system ("pause ");}

3. Compare the array names and addresses of int and char Arrays

#include<iostream>using namespace std;int main(){    int a[]={1,2,3};    char b[]={'a','b','c'};    cout<<a<<endl;    cout<<&a<<endl;    cout<<b<<endl;    cout<<&b<<endl;    system("pause");    }