C++ std::string to int

Slaxx · 10-30-2004, 09:40 PM

Is there a simple std::string member function that I can use to quickly convert to an int? In other words, I want to know if there's a FUNC such that:

std::string s = new std::string("1234");
int i = s->FUNC;

and i evaluates to 1234. If not, I can easily write my own; I'm just lazy, that's all. :^)

Thanks!

crabboy · 10-30-2004, 10:03 PM

You can use either atoi or the STLs stringstream. I'd suggest using the stringstream since you're already using the STLs string class.

Code:

#include<string>
#include<iostream>
#include<sstream>

void UsingATOI()
{
  std::string strIntString("1234");
  int iConvertToMe;

  iConvertToMe = atoi( strIntString.c_str());

  printf("Int is: %d\n", iConvertToMe );

}

// Using the STL
void STLConvert()
{
  std::string strIntString("1234");
  int iConvertToMe;

  std::stringstream strStream(strIntString);

  strStream >> iConvertToMe;

  std::cout << iConvertToMe << std::endl;

}


main()
{
  UsingATOI();
  STLConvert();
}