How do convert string to char?

[ChuckB]

Hi,
I have a function that requires a char. I like working with STL strings because they seem a bit friendlier to me. I would like to do something like this.

string s;
s="Hello";

// ...convert string s to char myChar here..
myChar[]= ????
myFunction(int a, int b, int c, char myChar);

I hope I have explained this well enough.


Regards,
ChuckB

[Zaei]

Use the [] operator:

string s("Hello");
char c = s[0];
// c now equals 'H'

If you mean char* (C style string), you can convert from std::string with the .c_str() member of std::string:

#include <iostream>
int myFunc(const char* c)
{
   std::cout << c << std::endl;
}

int main()
{
   string s("Hello");
   myFunc(s.c_str());
   return 0;
}

Z.

[ChuckB]

Hi Z,

Thanks!

#include <string>
#include <stdlib.h>
#include <iostream>

int myFunc(const char* c)
{
   std::cout << c << std::endl;
}

int main(int argc, char *argv[])
{
  string s("Hello");
  myFunc(s.c_str());
  system ("pause");
  return 0;
}

I modified it for Dev-C++...thanks again.

Is there a downloadable STL reference file (PDF/HTML) that shows functions with examples? A nice PC reference would be ideal.

Regards,
ChuckB

[Zaei]

http://msdn.microsoft.com/library . The Online MSDN should have all the info you need. Since the STL is standard, any documentation you find there should work correctly on any compiler.

Z.

[ChuckB]

Z,
I have VC++...duh! When digging through help .chm files on my PC. Anyway, the file named VCLANG.CHM deals with STL and C++ conventions (non-Microsoft stuff). I had the reference the whole time.

Regards,
ChuckB

[CornedBee]

And in case you ever need a non-const char*:
string str = "sdfksjdfksjdfkj";
char *sz = new char[str.size()+1];
strcpy(sz, str.c_str());

// ...

delete[] sz;

[ChuckB]

Thanks!
You guys have helped in a significant way. I have been building my first C++ OpenGL/GLUT game program. I needed to put camera coordinates on 2D HUD for reference...the above code helped perfectly.

Regards,
ChuckB