Stupid Programmer at work!

Code:

---

public class Test {
        char[] array = {'a', 'b', 'c', 'd'};
               
        public void run() {
                for (int a=0; a<array.length; ++a) {
                        for (int b=0; b<array.length; ++b) {
                                for (int c=0; c<array.length; ++c) {
                                        for (int d=0; d<array.length; ++d) {
                                                System.out.println(array[a] + ""
                                        + array[b] + "" + array[c] + "" + array[d]);
                                        }
                                }
                        }
                }
        }
       
    public static void main(String[] args) {
            Test test = new Test();
            test.run();
    }
}

---

Stupid programmer, that's me. I am coding a program to print out a 8 char password program, containing uppercase, lowercase alphabets, digits and special chars like @#!$%^. I have coded a prototype to test out my idea, it seems to work, but at this rate i will be coding 8 stupid for loops to get the job done. Is there any other way to optimize/simplify how it can be done?

:p

Just use one for loop and change the output based on an array, but first make sure your application makes logical sense.

Quote:

---

Originally posted here by chsh
Just use one for loop and change the output based on an array, but first make sure your application makes logical sense.

---

I have testout... it seems that my codes doesn't really work well if i am using 8 char password. Something is wrong with the codes.

Is your program to randomly generate passwords containing the characters you specified? If it is, I would simply have the one for loop with a pseudo random number generator in it like so:

Code:

---

public class test
{
        public static void main(String [] args)
        {
                char[] pwd = new char[8];

                for(int x=0; x<8; x++)
                {
                        do
                        {
                                int tmp = (System.random()*254)+1;
                        }
                        while(/*put in code to check that tmp is in correct range*/);

                        pwd[x] = (char)tmp;
                }

                System.out.println(tmp);
        }
}

---

For the arguments to the while loop, look at an ascii table (http://www.asciitable.com I think) and find out the decimal ranges that you need to make sure that only certain characters are chosen. Hope I didn't spoil your fun or something, and I hope that's what you were wanting.

[edit]If you need to have a certain mix of characters, all you need to do is add in some simple checking code to either rerun the above code till it gets the mix (not very clever) or to keep a tally of what has been chosen so far (not so random) and attempt to "fix" the selection[/edit]

ac

Quote:

---

Originally posted here by gothic_type
Is your program to randomly generate passwords containing the characters you specified? If it is, I would simply have the one for loop with a pseudo random number generator in it like so:

Code:

---

public class test
{
        public static void main(String [] args)
        {
                char[] pwd = new char[8];

                for(int x=0; x<8; x++)
                {
                        do
                        {
                                int tmp = (System.random()*254)+1;
                        }
                        while(/*put in code to check that tmp is in correct range*/);

                        pwd[x] = (char)tmp;
                }

                System.out.println(tmp);
        }
}

---

For the arguments to the while loop, look at an ascii table (http://www.asciitable.com I think) and find out the decimal ranges that you need to make sure that only certain characters are chosen. Hope I didn't spoil your fun or something, and I hope that's what you were wanting.

[edit]If you need to have a certain mix of characters, all you need to do is add in some simple checking code to either rerun the above code till it gets the mix (not very clever) or to keep a tally of what has been chosen so far (not so random) and attempt to "fix" the selection[/edit]

ac

---

well it is to generate all possible combinations of a 8 char password. So i believe there's a algorithm or something to follow, rather than 8 nested for loops to do the job

You want to print out every possible combination of an 8 char password using which characters exactly?

Thanks,
jag

Quote:

---

Originally posted here by ;TT
You want to print out every possible combination of an 8 char password using which characters exactly?

Thanks,
jag

---

Yup. What i did was creating a char array to hold all the characters including alphabets(uppercase/lowercase), numeric digits, and punctuation.

My way of doing it was creating 8 nested for loop to run through the array. I am thinking is there any better solution to the problem :D

I'm bored right now so I'll take a quick stab at it, can you write down EXACTLY what characters?

well, i am looking for an algorithm.... :p

Mmmhmmm.. I'm leaning towards what gothic said, you have to give a specifc range from which a character can be chosen using the ASCII table... from there you can have it create a list of every possible 8 character password there is. I don't know of any other way to get every possible 8 char possible password other than that.

Code:

---

public class Test {
    private int start = 33;
    private int end = 126;

    public void generateCombo() {
        for (int a = start; a <= end; ++a) {
            for (int b = start; b <= end; ++b) {
                for (int c = start; c <= end; ++c) {
                    for (int d = start; d <= end; ++d) {
                        for (int e = start; e <= end; ++e) {
                            for (int f = start; f <= end; ++f) {
                                for (int g = start; g <= end; ++g) {
                                    for (int h = start; h <= end; ++h) {
                                        System.out.println((char) a + "" +
                                            (char) b + "" + (char) c + "" +
                                            (char) d + "" + (char) e + "" +
                                            (char) f + "" + (char) g + "" +
                                            (char) h);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    public static void main(String[] args) {
        Test test = new Test();
        test.generateCombo();
    }
}

---

Well, this is what i have coded. I heard of recursion and some other algorithms would be able to do the job as well. Hope someone can shed some light on me lol :p

Code:

---

#include <iostream>

using namespace std;

int main() {

    char pw[6];

    int MAXVAL = 126;
    int MINVAL = 33;

    // Set the string to be the first password
    for (int i = 0; i < 6; i++) {
        pw[i] = MINVAL;
    }

    int pwCount = pow(MAXVAL - MINVAL, 6);

    for (i = 0; i < pwCount; i++) {
        if (++pw[5] >= MAXVAL) {
            pw[5] = MINVAL;

            if (++pw[4] >= MAXVAL) {
                pw[4] = MINVAL;

                if (++pw[3] >= MAXVAL) {
                    pw[3] = MINVAL;

                    if (++pw[2] >= MAXVAL) {
                        pw[2] = MINVAL;

                        if (++pw[1] >= MAXVAL) {
                            pw[1] = MINVAL;
                            pw[0]++;
                        }
                    }
                }
            }
        }
    }
           
}

---

ZeroCool, and I with the help of another online friend were able to pull this from our asses... yes, yes, it's C++ but it runs a lot faster than Java so you can use the concept and convert it to Java.

Just curious, what would you use this for? In the end this comes to hundreds of gb of data...

Quote:

---

Originally posted here by ;TT

Code:

---

#include <iostream>

using namespace std;

int main() {

    char pw[6];

    int MAXVAL = 126;
    int MINVAL = 33;

    // Set the string to be the first password
    for (int i = 0; i < 6; i++) {
        pw[i] = MINVAL;
    }

    int pwCount = pow(MAXVAL - MINVAL, 6);

    for (i = 0; i < pwCount; i++) {
        if (++pw[5] >= MAXVAL) {
            pw[5] = MINVAL;

            if (++pw[4] >= MAXVAL) {
                pw[4] = MINVAL;

                if (++pw[3] >= MAXVAL) {
                    pw[3] = MINVAL;

                    if (++pw[2] >= MAXVAL) {
                        pw[2] = MINVAL;

                        if (++pw[1] >= MAXVAL) {
                            pw[1] = MINVAL;
                            pw[0]++;
                        }
                    }
                }
            }
        }
    }
           
}

---

ZeroCool, and I with the help of another online friend were able to pull this from our asses... yes, yes, it's C++ but it runs a lot faster than Java so you can use the concept and convert it to Java.

Just curious, what would you use this for? In the end this comes to hundreds of gb of data...

---

Well, this is my assignment in school haha. Just curious about ways and ways of solving a problem =p

Death_Knight type out the entire specifications for your project for school. I am looking at what everyone is giving you and wondering first what the hell. Second, I don't truly understand what your professor wants you to do.

Quote:

---

Originally posted here by whizkid2300
Death_Knight type out the entire specifications for your project for school. I am looking at what everyone is giving you and wondering first what the hell. Second, I don't truly understand what your professor wants you to do.

---

Sorry, i didn't specify my requirements properly and pardon me for my bad english. Anyway i have solved my problem. :)