How to achive this task

Question

So heres a string:-
string x = "1hello";

And I want to convert the first char to a int:-

//Using stoi()
int y = stoi(x.at(0),nullptr);

And the compiler summoned a pokemon (Error)

So yeah , How to do that?
How to basically convert the char to a int?

Answer 1

In this snippet, I subtracting the ASCII value of '0' from the first character of the string, which effectively converts it to its integer value.

See this code⤵️
https://sololearn.com/compiler-playground/cYGdjvnDLcQw/?ref=app