C++ Overloading < > == for use with char * or string

I am trying to figure out how to overload <, >, and == to use with char * or string datatypes.

I am trying to take set of data and put into a data structure by value of the string, so I need a way to calculate:

dog > cat because D comes after C in the alphabet, and so on.

Please help - I'm really new to overloaded operators.
Thanks.

well if you are using a char * then you can just use strcmp.
If you are using std::string then it already has built in comparisons

strcmp(a,b) returns >1 if a > b, < 1 if a < b, or 0 if a==b.
Generally i only write two comparison operators and then use those two for the other four

Code:

---

bool operator == (const char *a, const char *b)
{
  return strcmp(a,b) == 0;
}

bool operator > (const char *a, const char *b)
{
  return strcmp(a,b) > 1;
}

bool operator >= (const char *a, const char *b)
{
  return (a==b) || (a>b);
}

---

Warning: I have not compiled or tested the above code and am not 100% sure it is correct, or if you can even overload the comparison between to char * in such a manner.

Err... I don't believe you can overload operations on built in data types.
You could make a thin structure over them and then add your operators. You could also use std::string in <string> as it already has those operators.