Laugh if you must, but i still need help

Well...i'm supposed to write a program that uses a datafile as the input. We're supposed to create a table of salaries based on the amount of sales and commission.

The input I've created as a datafile is:
250
561
736
832
841
934
975
1069
1100
1399
1500
1739
2222
4428
5233
6175
7419
8850
-1
The output is supposed to look like this somewhat:

Ranges: Number of People:
$200-299 9
$300-399 3
$400-499 0
$500-599 1
$600-699 1
$700-799 1
$800-899 1
$900-999 1
$1,000 and over 3

I'm a newbie and have no clue on how to do arrays...initialize and use....and I still have problems with my coding...can u take a look and help with what i need to fix to straighten things out?

// Program 6 - No Extra Credit
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

void salary[data410.dat];

#include <iomainp>

using std::setw;

int main ()
{
float s[ 9 ] = { $200-299, $300-399, $400-499, $500-599, $600-699,
$700-799, $800-899, $900-999, $1,000 and over };

cout<<"Range"<<setw(14)<<"Number of People"<<endl;

for (s = 0; s < 20; s++)
cout<<setw(15)<<s[s]<<setw(15)<<s<<endl;

salary(int sales);

return 0;
}

void salary(int sales)
{
float salary;

cin>>sales;
while (salary != -1);
salary = 200 + (sales * 0.09);
}

you'll have to use file handling in your code.

read from the data from the file
if it lies between some level increase that levels number by 1

like if you read 250 then value of level $200-299 should be increased by 1 and so on

HUH?

declare an array of 9 ints called s. declare an ifstream, open it and associate it with your file. while not end of file read file data into a variable of type int called sales one at a time. As each sales figure is read in send value to function to convert sales to salary. Evaluate salary using a series of if statements incrementing appropriate counter in the array using the following as an example:

if(salary > 200 && < 300)
s[0]++;
else if(salary > 300 && < 400)
s[1]++;
etc.

prepare summary statement to print out for user.