Problem forking child processes

[md5fungi]

I've been working on this code for quite a long time now, and I still can't seem to find out my problem. I'm trying to split a file that contains integers into 4 pieces, have each child process sum them, and then eventually pipe them to the parent process.

I've rewritten this program many ways, but my problem is always the same; I can get the first child process to sum its numbers, but the other child processes end up printing "0" for their individual sums.

Any ideas? (Note: I understand that the if-statement logic in the child process may be somewhat convoluted to understand, but I have double-checked it, and it works for the first child process)

#include <iostream>
#include <unistd.h>
#include <fstream>
#include <sys/wait.h>
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	int i,n=0,total_numbers=0,number, status, split_numbers; 
	int previous_number[4];
	int my_number[4];
	int current_number[4] = {1,1,1,1};
	int sum[4] = {0,0,0,0};
	pid_t pid;
	ifstream myfile;
	myfile.open("test.dat");
	while (myfile >> number) { 
		total_numbers++;
	}
	split_numbers = total_numbers/4;
	myfile.close();
	pid = fork();

	for (i=0; i<4; i++) {
		if (pid == 0) {
			cout << "Child Process " << i << " " << getpid() << endl;
			myfile.open("test.dat");
			my_number[i] = split_numbers * (i+1);
			previous_number[i] = split_numbers * i + 1;
			while (myfile >> number) {
				if (my_number[i] >= current_number[i] && previous_number[i] <= current_number[i]) {
					sum[i]+=number;
					cout << current_number[i] << endl;
					current_number[i]++;
				}
			}
			cout << sum[i] << endl;
			myfile.close();
			exit(0);
		} else { 
			waitpid(pid, &status, 0);
			cout << "Parent Process " << getpid() << endl;
			pid = fork();
		}
	}
	return 0;
}

edit:

NVM, current_number[i]++ should be outside the "if" loop. SOLVED.