数字字符串和数字互转

#include<iostream>
#include<string>
#include<sstream>
#include<vector>
using namespace std;
int main()
{
int s;
//数字转字符串
vector<int> v = { 1, 2, 3 };
stringstream ss;
for (int i = 0; i < v.size(); i++)
{
ss << v[i];
}
string sss;
sss = ss.str();
//字符串转数字
int num;
stringstream s1(sss);
s1 >> num;
cout << num;
return 0;
}