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Pascals Triangle

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Pascals Triangle, Coding
jdjprabhu
12 Jun, 2008 - 09:54 PM
Post #1

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CODE

class sal
{
    public static void main(String [] args)
    {
        int a,b,c,n=1;
        for(a=5;a>=1;a--)
        {
            for (c=1;c<a;c++)
            System.out.print(" ");
            for (b=1;b<=n;b++)
            System.out.print(n);
            n=n+2;
            System.out.println();
        }
    }
}

I am getting the answer as below
1
333
55555
7777777
999999999
like a triangle.

But I am not able to get the answer as below
1
222
33333
4444444
lik a triangle shape
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AmitTheInfinity
RE: Pascals Triangle
12 Jun, 2008 - 10:27 PM
Post #2

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I wrote this code on the fly [don't have java IDE to see it running.] so please check for syntax errors. But I think it should work for you.

java

int a,b,c,d,n=1;
    b= (5/2)+1;  //as you are doing this for 5 numbers. but try to keep that 5 as macro or some constant.
    d=1;
        for(a=5;a>=1;a--,b--)
        {
            for (c=0;c<=b;c++)
              System.out.print(" ");
            for (c=1;c<=d;c++)
              System.out.print(n);
            n++;    
            d+=2;        
            System.out.println("");
        }



I hope this will help you. smile.gif
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neotrumatrix
RE: Pascals Triangle
12 Jun, 2008 - 10:49 PM
Post #3

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QUOTE(jdjprabhu @ 12 Jun, 2008 - 10:54 PM) *

CODE


            System.out.print(n);
            n=n+2;
            System.out.println();



Simple mistake just should have checked again change the above code to this
CODE
System.out.print(n);
n++;
System.out.println();
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AmitTheInfinity
RE: Pascals Triangle
12 Jun, 2008 - 10:55 PM
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QUOTE(neotrumatrix @ 13 Jun, 2008 - 12:19 PM) *

QUOTE(jdjprabhu @ 12 Jun, 2008 - 10:54 PM) *

CODE


            System.out.print(n);
            n=n+2;
            System.out.println();



Simple mistake just should have checked again change the above code to this
CODE
System.out.print(n);
n++;
System.out.println();



won't work. as it's second for loop is dependent on n variable, it won't come up with proper triangle.
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gl3thr0
RE: Pascals Triangle
12 Jun, 2008 - 10:55 PM
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your problem is in this line here
for (b=1;b<=n;b++)

your using the variable tht you print to control the loop, which is a problem because if you want to change the value thats printed then you have to change the whole loop structure.

my advice would be to simply create another variable that is exactly the same as what n is now and use it to control your loop. that way your free to change n

This post has been edited by gl3thr0: 12 Jun, 2008 - 11:01 PM
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neotrumatrix
RE: Pascals Triangle
12 Jun, 2008 - 11:06 PM
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QUOTE(AmitTheInfinity @ 12 Jun, 2008 - 11:55 PM) *

QUOTE(neotrumatrix @ 13 Jun, 2008 - 12:19 PM) *

QUOTE(jdjprabhu @ 12 Jun, 2008 - 10:54 PM) *

CODE


            System.out.print(n);
            n=n+2;
            System.out.println();



Simple mistake just should have checked again change the above code to this
CODE
System.out.print(n);
n++;
System.out.println();



won't work. as it's second for loop is dependent on n variable, it won't come up with proper triangle.

The Second for loop is dependant on n variable but the n is changing after the looping !!!!! After the second for loop runs n value is changed ....

Just run the file and check out for yourself smile.gif

P.S Except when a = 10 the code works well .... Reason being obvious as 10 has 2 digits the triangle isnt proper !

This post has been edited by neotrumatrix: 12 Jun, 2008 - 11:07 PM
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AmitTheInfinity
RE: Pascals Triangle
12 Jun, 2008 - 11:30 PM
Post #7

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checked it sir!!!

and this was your modification's output
CODE

    1
   22
  333
4444
55555
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mensahero
RE: Pascals Triangle
12 Jun, 2008 - 11:35 PM
Post #8

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hello guys.. just a question.. isn't pascal triangle looks like this..

CODE

                  1
                121
                  12321
                    1234321
              123454321


correct me if i'm wrong.. blink.gif I know it's not a triangle.. but believe me it's hard to allign.. lmao.. blink.gif

Hmm.. that made me think or maybe like this..

CODE


nah probably the first one.. lmao.. :blink:  
      1
    232
  34543
4567654


This post has been edited by mensahero: 12 Jun, 2008 - 11:39 PM
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AmitTheInfinity
RE: Pascals Triangle
12 Jun, 2008 - 11:49 PM
Post #9

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You are absolutely right mensahero the pascal's triagle is way different than the one he shown here. But I just ignored what name he is using for his triangle as he is SHOWING what he wants. so I was ok even if he could have written prabhu's triangle... lol. biggrin.gif
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jdjprabhu
RE: Pascals Triangle
12 Jun, 2008 - 11:59 PM
Post #10

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Yes It was Useful.

And when I tried to print as below
1
22
333
4444
55555

like a triangle I am not able to get.Please help me.
CODE

class sal1
{
    public static void main(String []args)
    {
        for (int i=1;i<=5;i++)
        {
        for(int j=1;j<=i;j++)
        {
           System.out.print(i);
         }
         System.out.println();
     }
    }
}
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neotrumatrix
RE: Pascals Triangle
13 Jun, 2008 - 12:04 AM
Post #11

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QUOTE(AmitTheInfinity @ 13 Jun, 2008 - 12:30 AM) *

checked it sir!!!

and this was your modification's output
CODE

    1
   22
  333
4444
55555



Suprising ... I got a proper triangle when i ran the code !!

And yes that is not the pascal's triangle just went along with him tongue.gif
CODE

                                                 1
                                             1     1
                                          1     2     1
                                       1     3     3     1
                                    1     4     6     4     1
                                 1     5    10    10     5     1
                              1     6    15    20    15     6     1
                           1     7    21    35    35    21     7     1
                        1     8    28    56    70    56    28     8     1
                     1     9    36    84    126   126   84    36     9     1
                  1    10    45    120   210   252   210   120   45    10     1

This being a 10 row pascal triangle to be exact smile.gif
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mensahero
RE: Pascals Triangle
13 Jun, 2008 - 12:07 AM
Post #12

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Hmm.. you've discover prabhu triangle.. your a genius... lmao.. blink.gif .. that's way better than pascal..
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