How to convert int to string?

Question

how to convert the value of int to string?
I already convert the string to int to make a calculation.
After the calculation how to change the answer back to string?

Here is the coding that i already write to convert the string to int.

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

int main()
{
string x,z;
int y,a,sum;
cout<<"input the number x"<<endl;
cin>>x;
cout<<"input the number z"<<endl;
cin>>z;
a = stoi(z);
y = stoi(x);

cout<<"the number of y : "<<y<<endl;
cout<<"the number of z : "<<z<<endl;
sum=y+a;
cout<<"sum = "<<sum<<endl;

return 0;
}

now i need the solution to convert the (int sum) to string?

Answer 1

#include <sstream>

int main()
{
std::stringstream obj;
std::string str;
int value = 3939;

obj << 3939;
obj >> str;
}

Answer 2

In C++11 and later, you may even use 'to_string()' for the same.

Eg - string res = to_string(2);

Answer 3

Thank you very much!!