C++中将int转变成string和string转变成int

#include<iostream>
#include<string>
using namespace std;
int main()
{
string s;
char c[100];
int m=199;
itoa(m,c,10);
s=c;
s.insert(0,"zhang");
cout<<s<<endl;
return 0;

}

#include<iostream>
#include<string>
using namespace std;
int main()
{
string s="56sd";
int a=atoi(s.c_str());
cout<<a<<endl;
return 0;
}

#include<iostream>
#include<sstream>
#include<string>
using namespace std;
int main()
{
stringstream s;
string ss="234";
s<<ss;
s<<"abcd";

string s0;
int n;
s>>n;
s>>s0;

cout<<n<<"  "<<s0<<endl;

return 0;
}