Inserting commas using recursion

[Unregistered]

I am working on a program for class where I need to insert commas into a number using a recursive function. The program needs to take into account negative numbers. What I have so far in regards to the function is:
if(abs(n)<=999)
return n;
else
return Number(n-(n%1000)):
}
I need some direction as to how I submit a comma and if my program is flowing correctly. I tried to run it to try to get some idea as to what was going on but received "error LNK2001: unresolved external symbol_WinMain 16"

[blight2c]

i don't understand what you mean by "insert commas into a number", a number string maybe. but the unresolved external usally means the function prototype doesn't match the defination header. if you post the code maybe i could help more

[Unregistered]

This is the full code that I am using. Given a number eg. 10561. I am trying to right a recursive function that will display the number as 10,561.
#include<iostream>
#include<cstdlib>

using namespace std;

int Comma(int);//Recursive function to add commas to numbers

int main()
{
int number;//number to receive commas

cout<<"Enter a number: ";
cin>>number;
cout<<Comma(number);

return 0;
}
int Comma(int n)
{
if(abs(n)<=999)
return n;
else
return Comma(n-(n%1000));
}

[elad]

experiment with your program.

can you use % if n is negative?

what happens if n is negative and you substract n % 1000?

what happens if you put a line like:

cout << ',';

before as opposed to after this line:

return Comma(n-(n%1000));

????