boolalpha用法

1. 以下三条输出语句分别输出什么？[C易]
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; // 输出什么？false

cout << boolalpha << ( str3==str4 ) << endl; // 输出什么？false
cout << boolalpha << ( str5==str6 ) << endl; // 输出什么？true

头文件:
  #include  <iostream>
   using namespace std;

功能:
    把bool值显示为true或false