1. cin.get() 获取一个字符
int ch = cin.get();
cout << char(ch);
2. getline(,cin,char*)
string s;
getline(cin,s);
cout <<s ;
3. cin.peek()
cin.peeek()查看下一个
4. cout详解
#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
#include<iomanip>
using namespace std;
int main()
{
    float a = 3.1415;
    //1.设置精度为4
    cout.precision(3);
    cout << "总精度："<<a <<endl;
    //2.设置小数点后面精度
    cout.precision(1);
    cout << "小数点后面精度："<<fixed << a<< endl;
    //右对齐
    cout.width(10);
    cout<<"右对齐："<<right<<a<<endl;
    //输出各个进制
    cout<<"十六进制："<<hex<<10 << endl;
    cout<<"八进制："<<oct<<10 << endl;
    cout<<"十进制" << dec << 10 << endl;
    //
    //显示+号
    cout<<showpos<<3.32<<endl; 
    //cout<<showbase<<10.1<<endl; 
}