Question

not using the C standard library
do this in C++ ?

1. Convert string to char*
2. Covert int to char*

If i had to convert string to int in c++ use something like this

#include<iostream>
#include<string>
#include<sstream>
using namespace std;
int main()
{
    int num;
    string str="2020";
    (stringstream)"2020">>num;
    cout<<num+2;
    return 0;
}

Answer 1

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

int main (int argc, char* argv[])
{
    std::string str ("123");
    const char* c_str = str.c_str();

    char* so_bad = const_cast<char*>(c_str);

    std::stringstream ss;
    ss << so_bad;

    int int_value;
    ss >> int_value;

    std::cout << int_value;

    return 0;
}