数字与字符串相互转化的方法

#include<iostream>
using namespace std;
int main() {
    int n = 123;
    cout << to_string(n) << endl; 
    return 0;
}

#include <iostream>
#include <sstream>
using namespace std;
int main() {
    int n = 123;
    string s;
    stringstream stream;
    stream << n;
    stream >> s;
    cout << s << endl;
    return 0; 
} 

#include <iostream>
#include <sstream>//头文件 
using namespace std;
int main() {
    int n;
    string s;
    getline(cin, s);
    stringstream stream;
    stream << s;//将string类型存放在输入流中 
    stream >> n;//将从string类型的值赋给int类型的n 
    cout << n;
    return 0;
} 

#include <iostream>
#include <cstring> //函数的头文件 
using namespace std;
int main() {
string s = "123";
int n = stoi(s);
cout << n;
return 0;
}