string stl problem 1

[Tdrgabi]

hi ... i need an urgent answer to a problem ...

i have a lot of numerical values ... into strings (stl string).

i need to convert it to "int" because i want to do some math stuff with them ....
so how can i convert string ------->>> int ?

 

[ArkM]

Use old good atoi() from C/C++ library:

#include <cstdlib>
#include <string>
...
string s = "12345";
int i = atoi(s.c_str()); // c_str() string member function.

c_str() returns a pointer to C-like representation (with zero terminator) of a stl::string object...

 

[uolj]

Or stringstreams:

#include <sstream>
#include <string>
...
std::string s("12345 5.23 7");
std::istringstream istr(s);
int i, j;
double d;
istr >> i >> d >> j;