`itoa' undeclared (first use this function)

have a look at
http://www.cplusplus.com/ref/cstdlib/itoa.html
This function is not ANSI C and thus only supported by some compilers. Could it be replaced with sprintf?

itoa() is not supported on all UNix platforms natively. Example above by rstaveley is good to do this function,.

I always use the following -


#include <iostream>
#include <sstream>

static inline string IntTypeToStr(int x){
            std::ostringstream o;
            if (!(o << x))
                  printf("Error in conversion from int to string \n");
            return o.str();
      }

int main()
{
     int i = 10;
     std::cout << "The number is "+IntTypeToStr(i)+"\n";
}

I do not want to print it out. Instead I want to convert the integer into char* .
I want to copy each character into another array of char.

Yup, it works.

Notice that character arrays and IOStreams/STL always look a bit clumsy?

> I want to copy each character into another array of char

It sounds like you are working with code in the C mindset rather than C++ mindset. Under those circumstances, I'd go for SteH's suggested sprintf.

        i = 1234;
        char buf[1024]
        sprintf(buf,"%d",i);

However, you should be feeling some sort of draw towards using std::string rather than those evil old character arrays and pointers :-)