Question

So I got asked this on a skills test for an internship, and at the time it completely baffled me. I have some code now that I thought should work, but isn’t assigning the correct values to the string.

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

int main()
{
     // declarations
     int i = 0, num= 63;
     string b="";

     while (num != 0)
     {
          i = num % 10;
          b.insert(0,i + 48 + "");
          num = num/10;
     }


     cout << b << endl;

     return 0;
}

With “num” being the integer value (I just used 63 as an example)

EDIT:: I incorrectly paraphrased, I could not use any function that did an int to string conversion for me, not that I couldn’t use the string library, my mistake.

Answer 1

Change the insert line to

b.insert(0, 1, '0' + i);

This will insert the character obtained from adding i to '0' once at index 0 in the string.

---

Explanation of why your code isn’t working:

b.insert(0,i + 48 + "");

the line above is calling

basic_string::insert( size_type index, const CharT* s );

where the pointer is being determined by adding 48 + i to the address of the "" string literal, resulting in garbage.