C++: Dividing double from string index gives incorrect answer

Question

I am trying to divide a digit in a string which is selected by its index by 10. But instead of giving me 0.x, it provides me a different answer.

Here is an example to reproduce the error:

#include <iostream>

using namespace std;

int main()
{
    string y = "2";
    double x = y[0];
    cout << x/10.0 << endl;
}

In addition to what @Evg said: [Convert char to int in C and C++](https://stackoverflow.com/questions/5029840/convert-char-to-int-in-c-and-c) which explains the meaning of `y[0] - '0'` — t.niese, Sep 14 '21 at 07:36
`... / 10.0` will do such a conversion for you. `x` could be of type `int`. — Evg, Sep 14 '21 at 07:45

score -1 · Answer 1 · answered Sep 14 '21 at 07:30

-1

You can't divide strings, you need to convert it to an integer.

answered Sep 14 '21 at 07:30

Benjamonster

OP doesn't divide strings. They divides `double`s. – Evg Sep 14 '21 at 07:31
@Evg OP divides a value originally of type `char`, and read in as a character, by a `double`, so @Benjamonster is not completely wrong – codeling Sep 14 '21 at 08:17
@codeling `x` has type `double`. `x / 10.0` is a division of two `double`s. – Evg Sep 14 '21 at 08:46

1 Answers1