A few things...

Ok so just a few code tidbits needed - a function to add all the odd integers from 1 to n, a function that adds all the integers up from 1 to a number equalling that number such as 1 + 2 + 3 + 4 if they enter 10, and a function that adds the digits of a negative number such as 3 if the number is -12 or 5 if the number is -23.

Thanks please :)

Hi,

Have you tried to do this by yourself yet? If so please post your code and say what you are having a problem with and then we'll be able to help you.

They aren't all that hard to do.

Took me 30 minutes this morning to cobble some things together...

I got the first two but for the next question, which is really just finding the sums of a NONnegative number, I jotted down the stuff below then got too confused:

public class test{
int i = 0;
public static int lube(int n){
while (i < n){
i = (n / 100) + (n / 10 % 10) + (n % 10);}
return i;}}

Is it something like that?

Can you please elaborate on your last assignment?

-petter

Quote:

---

Originally Posted by Frankmms

I got the first two but for the next question, which is really just finding the sums of a NONnegative number, I jotted down the stuff below then got too confused:

public class test{
int i = 0;
public static int lube(int n){
while (i < n){
i = (n / 100) + (n / 10 % 10) + (n % 10);}
return i;}}

Is it something like that?

---

Have a look at this:

Code:

---

int addDigits(int num)
  {
      int sum = 0;

      while(num > 0)
      {
        sum += (num % 10); // gets the last digit and adds it to the sum

        num = num / 10; //relies on integer division to move the number down.
      }

      return sum;
  }

---

You could also convert the number to a String, strip of the minus sign, convert all the characters back to integers and then add them.

Code:

---

public int addDigits(int num){
        String s = String.valueOf(num);
        String[] chars = s.split("");
       
        int sum = 0;
        for(int i = 0; i < chars.length; i++){
                try{
                        sum += Integer.parseInt(chars[i]);
                }catch(NumberFormatException nfe){
                        //Catch block will catch the
                        //Exception that gets thrown when
                        //trying to convert the minus sign
                        //to an int and will ignore it
                }
        }
       
        return sum;
}

---

Taking the sum and dividing it by 10 each time the loop runs then modding to get the last number looks like the easiest way to do it :) Thanks all.

Haha back again...One day this thread will be hundreds of pages long :O

Ok so I'm supposed to create a triangle out of ***s, given a number of rows, so if you put in 3, it makes the triangle 3 rows tall, 4 is 4 rows tall, etc, looking like:

3 spaces *
2 spaces ***
1 space *****
0space*******

I have no idea how to go about even starting this :(

A new problem should start a new thread...

Think about how you would do it if you had to use a typewriter and paper (i.e. line by line). Then translate those steps into code.

Give me a fish and I eat for a day. Teach me to fish and I eat for a lifetime...
Chinese proverb

Ok so I'm thinking

public int makeTriangle(int rows){
for (i=1; i > rows; i++){
System.out.println("Okay now I get lost");}}

Quote:

---

Originally Posted by Frankmms

Ok so just a few code tidbits needed - a function to add all the odd integers from 1 to n, a function that adds all the integers up from 1 to a number equalling that number such as 1 + 2 + 3 + 4 if they enter 10, and a function that adds the digits of a negative number such as 3 if the number is -12 or 5 if the number is -23.

Thanks please :)

---

Well, to become a programmer you need to know basic math. The one builds on the other, stupid.

It's not math I have trouble with, it's converting math into Java, stupid.

Quote:

---

Originally Posted by Frankmms

It's not math I have trouble with, it's converting math into Java, stupid.

---

So what's the problem then, smartie?

It's not math I have trouble with, it's converting math into Java, stupid.

I also don't get the adding spaces in front of the ***s to make it a centered triangle, maybe another loop, but that's the problems I'm having.

Ah that triangle program again! I've seen it so many times. You could pretty much search the java forum here @ codeguru and find the same problem WITH supporting source code. There are several ways to go about doing this. Just take it step by step. I can guarantee you that your algorithm will be totally different from someone elses. Of course, you will probably embed this in some kind of loop. First, I suggest you write the loop the best way you know how, then read each statement within the loop as if YOU were the compiler. Helps a bunch in the long run. Really, it is just basic math though. No tricky java syntax. The most complex java thing that you will probably use is the for-loop. If you understand what a for loop is, then you should be fine =)

Code:

---

public int makeTriangle(int rows){
for (i=1; i > rows; i++){
System.out.println("Okay now I get lost");}}

---

Ok, so have you run this code. If so what happens?

Quote:

---

Originally Posted by _uj

Well, to become a programmer you need to know basic math. The one builds on the other, stupid.

---

Steady on _uj, there's no need to insult the guy.