Conversion between the character char, string string, integer int

#include <iostream>
#include <string>
#include <sstream>

using namespace std ;


void i2s(int x, string &basic_string) {
    stringstream ss;
    ss << x;
    ss >> basic_string;
}

void s2i(string &basic_string , int &x ) {
    stringstream ss;
    ss << basic_string;
    ss >> x;
}

void c2s(char c , string & s){
	stringstream stream;
	stream << c;
	s = stream.str();
}



int main(){
	
	string str = "123";
	int  c ;
	
	s2i(str , c);
	
	cout << c ;
}