Reputation: 1109

convert string to long long

I'm using VS 2008 to create a C++ DLL (not managed) project and I need convert a char* to a long long type. Is there an easy way to do it?

Thanks in advance :)

Upvotes: 9

Answers (4)

Reputation: 163

Another option is using stoll() found within the string library. Takes a C++ string.

long long ll = std::stoll(mystr);

Upvotes: 7

Reputation: 46813

The easiest way is to use the std::stringstream (it's also the most typesafe...)

std::stringstream sstr(mystr);
__int64 val;
sstr >> val;

You may need to target a 64-bit application for this to work.

Upvotes: 15

Reputation: 14121

If you're using boost, lexical_cast is the way to go, in my opinion.

long long ll = boost::lexical_cast<long long>(mystr)

Upvotes: 8

Reputation: 364

Try _atoi64. This takes char* and returns __int64.

Upvotes: 6