C++ atoi()和stoi()的区别

//myfirst.cpp--displays a message   
 
#include "stdafx.h"  
#include <iostream>  
#include <set>  
#include <string>  
using namespace std;
int main()
{
    string s1 = "2147482", s2 = "-214748";
    string s3 = "214748666666663", s4 = "-21474836488";
    cout << stoi(s1) << endl;
    cout << stoi(s2) << endl;
    cout << atoi(s3.c_str()) << endl;
    cout << atoi(s4.c_str()) << endl;
    return 0;
}