There are a few things that is worth pointing out from strictly the C++ point of view.
The code you have written, while still being valid C++, seems structured kind of in a C-fashioned way; there are a lot of C++ specific features that may be used to improve it.
C Headers
In C++ including stdio.h should be avoided. The C++ standard library provides the iostream header for IO operations. For example, the two following snippets are equivalent:
// C-fashion
#include <stdio.h>
void print_sum(int a, int b) {
printf("%i\n", a + b);
}
// C++ fashion
#include <iostream>
void print_sum(int a, int b) {
std::cout << a + b << std::endl;
}
I'm not sure whether the inclusion of C headers is still possible in C++, if it's just a compiler extension, or if it's just intended for backwards compatibility.
Allocation
Avoid using C dynamic allocation in C++ (malloc, calloc... etc stdlib.h functions). C++ introduces the new keyword. Refer to this SO question.
Headers
In the rare occasions where you really need a C header included. C++ has its own bindings for that.
#include <cstdio> // C's stdio.h
#include <cstdlib> // C's stdlib.h
Take a look at this.
Naming convention
This is just a suggestion, you are free to use whatever naming convention you feel comfortable with as long as your code is not supposed to be part of a pre-existing project. Consistency is the first thing.
I would rather use lowercase_with_underscores names for local variables and functions.
I'd suggest you to take a look at Google C++ Style Format.
Apart from this there's the define thing of mindoverflow's answer