asked on

string to double

i get a string from a line I'm parsing.

string notdegree= buf[2]; returns a number but its a string

string degree= notdegree.substr(0,5); returns the part of the number i want still a string

indegree = degree/60 -- i need to be able to do this -- how do I change something from a string to a number

the following is the error i get

C:\Program Files\Microsoft Visual Studio\MyProjects\parse\parse.cpp(98) : error C2676: binary '/' : 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' does not define this operator or a conversion to a type acc
eptable to the predefined operator

ASKER CERTIFIED SOLUTION

Dexstar

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

tpiazza

ASKER

tried that it errors out

C:\Program Files\Microsoft Visual Studio\MyProjects\parse\parse.cpp(100) : error C2664: 'atof' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.

tpiazza

ASKER

take that back -- it works now

indegree = atof(degree.c_str())/60.0;

.c_str() -- I dint have that -- what does it do?

tinchos

c_str method

Returns a pointer to a null-terminated array of characters representing the string's contents.

Tincho

Dexstar

It returns a const char* to the data in the string... :)

Dex*