Question

I’m constructing a line command based chess engine. When a command is given to the engine (as a string), I have a couple of regex expressions run to determine if the command is valid. If it’s valid, then the command is passed on to be parsed.

When a command such as a6a4 is given to the engine in string input;, is it valid to use a command like:

istringstream (input.at(1)) >> originalx; or:

istringstream buffer(input.at(1)); buffer >> originalx;

to convert just the part of the string with the integer into an actual int? I have been trying these methods of conversion, all using str.at(x) rather than just str and none of them seem to be working.

I know this may seem like a duplicate question because everyone wants to know how to convert an entire string to an int, but what about just a specific part of a string? I did search Google for answers as well but nothing I found was helpful.

Answer 1

I know this may seem like a duplicate question because everyone wants to know how to convert an entire string to an int, but what about just a specific part of a string?

A specific part of a string is still a string. You can just do str.substr(1, 1) and convert that whole sub-string to an int.