掌握基本的输入和输出
1.#include <iostream>
2.输出
　　　2.1 cout +<<
　　　2.2 endl
3.输入
   3.1 cin >>

#include <iostream>
#include <cstdio>
int main() 
{
    //1.输出 C++支持C语言的转义字符，目前不需要考虑C++的，
    //也不需要考虑数据的精度(流控制字符)
    printf("ILoveyou\n");
    std::cout << "ILoveyou\n" ;   //没有省略命名空间，std::
    using namespace std;
    cout << "ILoveyou\n";   
    printf("%d%s\n", 1, "ILoveyou");
    //2.C++输出不需要格式控制字符（%d %f %lf）
    cout << 1 << "ILoveyou" << "\n";
    //吃饱了没事干，等效下面写法
    cout << 1;
    cout << "ILoveyou";
    cout << "\n";
    cout << '\n';
    cout << "name" << "\t" <<"age"<< "\n";
    char name[20] = "张三";
    int age = 11;
    cout << name << "\t" << age << "\n";
    //换行: endl
    cout << name << "\t" <<age<< std::endl;
    //2.输入
    cout << "input name" << endl;
    cin >> name;
    cout << "input age";
    cin >> age;
    cout << name << "\t" << age << endl;
    cout << "input name,age" << endl;
    cin >> name >> age;
    cout << name << "\t"<<age << endl;
    //3.有些编译器依旧存在字符或者字符串输入跳过问题
    char userKey = 0;
    cin >> userKey;
    //while (getchar() != '\n');
    cout << userKey << endl;
    char str[20] = "";
    cin >> str;
    cout << str << endl;
    return 0;
}