c++学习笔记（cout小知识点）

 1 #include <iostream>
 2 int main()
 3 {
 4     using namespace std;
 5     int x;
 6 
 7     cout<<"The expression x=100 has the value ";
 8     cout<<(x=100)<<endl;
 9     cout<<"Now x= "<<x<<endl;
10     cout<<"The expression x<3 has the value ";
11     cout<<(x<3)<<endl;                //像x<3这样的关系表达式将被判定为bool值true和false
12     cout<<"The expression x>3 has the value ";
13     cout<<(x>3)<<endl;               //但cout将在显示bool值之前将它们转换成int
14     cout.setf(ios_base::boolalpha);//该函数调用设置了一个标记，该标记命令cout显示true和false，而不是0和1
15     cout<<"The expression x<3 has the value ";
16     cout<<(x<3)<<endl;
17     cout<<"The expression x>3 has the value ";
18     cout<<(x>3)<<endl;
19     return 0;
20 }