Chapter 3, Problem 13C

Explanation of Solution

Program code:

//include the header files

#include <iostream>

#include<string>

//use the namespace

using namespace std;

//define the recursive method convertString()

void convertString(const std::string& str, int &res, int n = 0)

{

//if the condition is true

if (n == str.size())

//return

return;

//set the value of res

res *= 10;

res += str[n] - '0';

//call the function by itself

return convertString(str, res, n + 1);

}

//define the main() method

int main()

{

//declare the required methods

int n = 0;

//...