Need help with a Data Structures program

[jctcis2014]

1.Create a C++ project with the program file below
2.Run the original program on the original data and see that your output is as below.
**note that the first number is the count of numbers remaining in the file
3.Make modifications to the program so that
**You find and print out all the pairs of numbers from the file that add up to zero.
**for each pair, print the two numbers, then print their their indices in order - all four values on 1 line
**do not include the count when looking for pairs
**when all pairs are found, print how many pairs there were
**you may add functions to your program
**you will almost surely add an array
**do not change anything in the main function before or after the comment lines marking the
boundaries of change

•Here is the output of the original program:
10
4
-10
5
3
29
-3
0
75
-3
10
It took 15 clock ticks to process the file

•Here is what the output should be like after modification:
-10 10 1 9
3 -3 3 5
3 -3 3 8
n pairs = 3
It took 15 clock ticks to process the file
**Note that the time will not be 15 ticks - this is just an example**

The .cpp file is as follows:
#include <iostream>
using std::cerr;
using std::cout;
using std::endl;

#include <fstream>
using std::ifstream;
#include <cstdlib> // for exit function

#include <ctime> // for timing in ticks

// This program reads values from the file 'example.dat'
// and echoes them to the display until a negative value
// is read.

int main() {
clock_t t; // for keeping time in clock ticks
// see http://www.cplusplus.com/reference/ctime/clock/
t = clock();

ifstream indata; // indata is like cin

///// code below will be changed by you /////
int num; // variable for input value
indata.open("data.txt"); // opens the file
if(!indata) { // file couldn't be opened
cerr << "Error: file could not be opened" << endl;
exit(1);
}
indata >> num;
while ( !indata.eof() ) { // keep reading until end-of-file
cout << num << endl;
indata >> num; // sets EOF flag if [b]no value found
}
///// code above will be changed by programmer /////

indata.close();
t = clock() - t;
cout << "It took " << t << " clock ticks to process the file" << endl;


return 0;
}[/b]

[MikeyBoy]

And? What are you asking?

[jctcis2014]

I'm asking for the code that will allow the checking of pairs and printing it out only if its sum is 0. At least that's what I think is being asked.