How Do I Read a File to a Program?

I tried to search Google, and found absolutely nothing simple that could help. Basically, what I need to do is make filter options for a program. I have no idea how to do this at all. The program I have is this:

Code:

---

#include <ctime>
#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
int arrayname[10], q = 0;
while (q < 10) //assign each element of arrayname[] to a random integer from 1 to 10
{
arrayname[q] = rand()%10;
q++;
}
q = 0;
while (q < 10) //cout every element of arrayname on its own line
{
cout << arrayname[q]
q++
}

---

What I want to be able to do is make it so that, from an external file, you can set numbers that cannot be chosen. So, you can go into a separate file, and choose that you don't want the random generator to ever get the numbers 4 or 7, or something like that. I just need to be able to filter it using an external file. How do I do it? Can someone tell me, or just link me to a tutorial?

Sorry for wasting your time. =[

You can look here on how to open and read from a file
For example, if you have two numbers in a line like "4 7" separated by space, you can read this line and then parse the string and separate "4" and "7".
To convert a string to an actual integer to use in your code take a look at this for example

You can make your own Rand() function and after reading the file and parsing the excluded integers do something like:

Code:

---

FUNCTION Rand : integer
VARIABLES
    random : integer
    i : integer
BEGIN

LOOP
    random <- rand()
    FOR i FROM 1 TO sizeof(exclusionArray)
        IF random = exclusionArray[i]
            BREAK FOR
        END IF
    NEXT i
WHILE i < sizeof(exclusionArray)
Rand <- random

END

---

Disclaimer: I don't know if this pseudocode is working or even if I made up some of the names, use at your own risk! :tongue:

Quote:

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Originally Posted by C_ntua

You can look here on how to open and read from a file
For example, if you have two numbers in a line like "4 7" separated by space, you can read this line and then parse the string and separate "4" and "7".
To convert a string to an actual integer to use in your code take a look at this for example

---

Thanks, I'll check it out.

Quote:

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Originally Posted by GReaper

You can make your own Rand() function and after reading the file and parsing the excluded integers do something like:
Disclaimer: I don't know if this pseudocode is working or even if I made up some of the names, use at your own risk! :tongue:

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I'll try that out, and see if I can get it to work, but either way I would need to be able to read from a file before I can make use of it. =P

Apparently, the board no longer wants me to edit my other post, since it won't let me, so I guess I have no choice but to double post.

I can comfortably read from files with the use of ifstream, and that is exactly what I needed to do, so thank you. However, what if I need to read data from two different files? It doesn't seem to want me to use ifstream twice.