c++ 字符串

using namespace std;
#include <iostream>
int main(){

char * boolalpha = "hello:";
char str1[]       = "abc";
char str2[]       = "abc";
const char str3[] = "abc";
const char str4[] = "abc";
const char* str5  = "abc";
const char* str6  = "abc";
cout << boolalpha << ( str1==str2 ) << endl; // .....
cout << boolalpha << ( str3==str4 ) << endl; // .....
cout << boolalpha << ( str5==str6 ) << endl; // .....

cout << sizeof(str1) << endl;           // 4
cout << sizeof(str1[0]) << endl;      //  1
cout << sizeof(str5) << endl;          //  4

}