C++小tip之字符串与数字互转

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

// 数字转字符串
void toString(string &s, int &num){
    stringstream ss;
    ss << num;
    ss >> s;
}

// 字符串转数字
void toInt(string &s, int &num){
    stringstream ss;
    ss << s;
    ss >> num;
}

int main(){
    string s;
    int num = 10;

    toString(s, num);
    cout << s << endl;
    
    s = "999";
    toInt(s, num)
    cout << num << endl;
    
    return 0;
}