#include<bits/stdc++.h>
using namespace std;

int main(){
    string s ;
    int num= 34 ;
    stringstream   ss;//内存字符串 
    ss << setw(8) << setfill('0') << num << endl;//按八位补其前导零 
    s = ss.str();//转换常规字符串 
    cout << s;

    //用法二
    int a = 12;
    int b = 20; 
    char f = 'x';
    string d = "hello" ;
    stringstream   ss1;
    ss1 << a << " " << b << " " << f << " " << d;
    cout  << ss1.str() << endl;

    //用法三：序列化
    int aa;
    int bb;
    char ff;
    string dd;
    ss1 >>  aa >> bb >> ff >> dd;
    cout << aa  << bb <<  ff << dd;
    return 0;
}

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