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C# Help

2009-04-23, 3:47 PM #1

BombayZeus

NDNmojo.

Posts: 1,203

I have to generate the following output using only nested for-loops.

Quote:

6
5 6
4 5 6
3 4 5 6
2 3 4 5 6
1 2 3 4 5 6

This shouldn't be this hard. Anybody wanna help me out? :smith:

2009-04-23, 3:54 PM #2

Pommy

Lommy Dommy

Posts: 5,773

I don't know C# so I will write in a Java-ish pseudocode

Code:

String output = "";

for (int i=6; i>0; i--) {
  output = output.splice(((Integer)i).toString(), 0); //Add the next lowest number to the beginning of the string

  --OR--
 output = ((Integer)(i)).toString() + output; //append the existing string to the end of the current number

  print output;
}

(Again, this would not compile in Java or another language, it's just to show logic)

一个大西瓜

2009-04-23, 3:55 PM #3

Emon

Imon, umon...everymon!

Posts: 19,022

Code:

for (int i = 6; i >= 1; i--)
{
    for (int k = i; k <= 6; k++)
    {
        Console.Write(k + " ");
    }
    Console.WriteLine();
}

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2009-04-23, 4:01 PM #4

Pommy

Lommy Dommy

Posts: 5,773

Oh, you're not allowed to use variables. Doh.

一个大西瓜

2009-04-23, 4:05 PM #5

Emon

Imon, umon...everymon!

Posts: 19,022

What? No, you can, but regardless your code does not work at all.

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2009-04-23, 4:20 PM #6

Pommy

Lommy Dommy

Posts: 5,773

Err yes it does. Besides the fact that it's not written in C# or any real programming language, why wouldn't it?

Init:
output is ""

For loop:
i = 6
output = ""
output becomes 6
print 6

i = 5
output = 6
output becomes 56
print 56

i = 4
output = 56
output becomes 456
print 456

etc

一个大西瓜

2009-04-23, 4:25 PM #7

Emon

Imon, umon...everymon!

Posts: 19,022

Oh sorry, I thought your print was outside the loop.

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2009-04-23, 4:27 PM #8

BombayZeus

NDNmojo.

Posts: 1,203

Thanks a bunch Emon.

I just need help on one more:

Quote:

0 0 0 0 0 1
0 0 0 0 2 1
0 0 0 0 2 1
0 0 0 3 2 1
0 0 4 3 2 1
0 5 4 3 2 1
6 5 4 3 2 1

2009-04-23, 5:01 PM #9

Jedi Legend

Doesn't Sleep Welll

Posts: 1,380

Code:

for (i = 1; i <= 6; i++) {
   for (k = i; i < 6; i++) 
      print(0+" ");
  print(i);
}

2009-04-23, 5:09 PM #10

Emon

Imon, umon...everymon!

Posts: 19,022

JL, your code just prints "0 0 0 0 0 6"

Because I'm bored:

Code:

for (int i = 1; i <= 6; i++)
{
    for (int j = 6; j > i; j--)
    {
        Console.Write("0 ");
    }
    for (int k = 1; k <= i; k++)
    {
        Console.Write(k + " ");
    }
    Console.WriteLine();
}

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2009-04-23, 5:21 PM #11

Couchman

Idaho Potato

Posts: 2,282

it is the same as Db, if that helps at all

2009-04-23, 5:24 PM #12

TimeWolfOfThePast

Why not?

Posts: 5,785

Did everyone just do your homework?

twitter | flickr | last.fm | facebook |

2009-04-23, 5:56 PM #13

Detty

Britlandish

Posts: 5,649

Code:

def foo(count=1,limit=6):
	if count <= limit:
		foo(count=count+1,limit=limit)
		print " ".join([str(x) for x in range(limit,count-1,-1)])
foo()

def bar(count=1,limit=6):
	if count <= limit:
		bar(count=count+1,limit=limit)
		print " ".join(['0' for x in range(1,count)] + [str(x) for x in range((limit+1)-count,0,-1)])
bar()

I forgot to use C#

Detty. Professional Expert.
Flickr Twitter

2009-04-23, 6:25 PM #14

dalf

Everyone's favorite alcoholic administrator!

Posts: 8,683

Originally posted by TimeWolfOfThePast:

Did everyone just do your homework?

Pretty much.

Code to the left of him, code to the right of him, code in front of him compil'd and thundered. Programm'd at with shot and $SHELL. Boldly he typed and well. Into the jaws of C. Into the mouth of PERL. Debug'd the 0x258.

2009-04-23, 6:49 PM #15

BombayZeus

NDNmojo.

Posts: 1,203

No actually there's a whole bunch of em and I've just been struggling with these two. But thanks a lot guys. Much appreciated

2009-04-23, 7:20 PM #16

The MAZZTer

⌐_⌐

¬_¬

Posts: 6,095

Code:

                                  #include\
                                  <stdio.h>
                     #include                <stdlib.h>
                     #include                <string.h>

                    #define w "Hk~HdA=Jk|Jk~LSyL[{M[wMcxNksNss:"
                   #define r"Ht@H|@=HdJHtJHdYHtY:HtFHtF=JDBIl"\
                  "DJTEJDFIlMIlM:HdMHdM=I|KIlMJTOJDOIlWITY:8Y"
                 #define S"IT@I\\@=HdHHtGH|KILJJDIJDH:H|KID"\
                "K=HdQHtPH|TIDRJDRJDQ:JC?JK?=JDRJLRI|UItU:8T"
               #define _(i,j)L[i=2*T[j,O[i=O[j-R[j,T[i=2*\
              R[j-5*T[j+4*O[j-L[j,R[i=3*T[j-R[j-3*O[j+L[j,
             #define t"IS?I\\@=HdGHtGIDJILIJDIItHJTFJDF:8J"

    #define y                  yy(4),yy(5),                yy(6),yy(7)
  #define yy(              i)R[i]=T,T            =O,O=L 
#define Y _(0          ], 4] )_ (1 ], 5] )_ (2      ], 6] )_ (3 ], 7] )_=1
#define v(i)(      (( R[ i ] * _ + T [ i ]) * _ + O [ i ]) * _ + L [ i ]) *2
double b = 32  ,l ,k ,o ,B ,_ ; int Q , s , V , R [8 ], T[ 8] ,O [8 ], L[ 8] ;
#define q( Q,R ) R= *X ++ % 64 *8 ,R |= *X /8 &7 ,Q=*X++%8,Q=Q*64+*X++%64-256,
# define  p      "G\\QG\\P=GLPGTPGdMGdNGtOGlOG"   "dSGdRGDPGLPG\\LG\\LHtGHtH:"
#  define W         "Hs?H{?=HdGH|FI\\II\\GJlHJ"    "lFL\\DLTCMlAM\\@Ns}Nk|:8G"
# define   U           "EDGEDH=EtCElDH{~H|AJk}"       "Jk?LSzL[|M[wMcxNksNst:"
#  define u                  "Hs?H|@=HdFHtEI"             "\\HI\\FJLHJTD:8H"
char  *   x                   ,*X , ( * i )[               640],z[3]="4_",
*Z = "4,8O4.8O4G" r U "4M"u S"4R"u t"4S8CHdDH|E=HtAIDAIt@IlAJTCJDCIlKI\\K:8K"U
 "4TDdWDdW=D\\UD\\VF\\FFdHGtCGtEIDBIDDIlBIdDJT@JLC:8D"t"4UGDNG\\L=GDJGLKHL\
FHLGHtEHtE:"p"4ZFDTFLT=G|EGlHITBH|DIlDIdE:HtMH|M=JDBJLDKLAKDALDFKtFKdMK\
\\LJTOJ\\NJTMJTM:8M4aGtFGlG=G|HG|H:G\\IG\\J=G|IG|I:GdKGlL=G|JG|J:4b"W
S"4d"W t t"4g"r w"4iGlIGlK=G|JG|J:4kHl@Ht@=HdDHtCHdPH|P:HdDHdD=It\
BIlDJTEJDFIdNI\\N:8N"w"4lID@IL@=HlIH|FHlPH|NHt^H|^:H|MH|N=J\\D\
J\\GK\\OKTOKDXJtXItZI|YIlWI|V:8^4mHLGH\\G=HLVH\\V:4n" u t t
"4p"W"IT@I\\@=HdHHtGIDKILIJLGJLG:JK?JK?=JDGJLGI|MJDL:8M4\
rHt@H|@=HtDH|BJdLJTH:ITEI\\E=ILPILNNtCNlB:8N4t"W t"4u"
p"4zI[?Il@=HlHH|HIDLILIJDII|HKDAJ|A:JtCJtC=JdLJtJL\
THLdFNk|Nc|\
:8K"; main (
int C,char**        A) {for(x=A[1],i=calloc(strlen(x)+2,163840);
C-1;C<3?Q=_=       0,(z[1]=*x++)?((*x++==104?z[1]^=32:--x), X =
strstr(Z,z))      &&(X+=C++):(printf("P2 %d 320 4 ",V=b/2+32),
V*=2,s=Q=0,C     =4):C<4?Q-->0?i[(int)((l+=o)+b)][(int)(k+=B)
]=1:_?_-=.5/    256,o=(v(2)-(l=v(0)))/(Q=16),B=(v(3)-(k=v(1)
))/Q:*X>60?y   ,q(L[4],L[5])q(L[6],L[7])*X-61||(++X,y,y,y),
Y:*X>57?++X,  y,Y:*X >54?++X,b+=*X++%64*4:--C:printf("%d "
,i[Q][s]+i[Q ][s+1]+i[Q+1][s]+i[Q+1][s+1])&&(Q+=2)<V||(Q=
0,s+=2)<640
||(C=1));}

This program takes a string and writes a PGM image of the text in elvish.

Program help: http://www0.us.ioccc.org/2004/anonymous.hint

Moar: http://www0.us.ioccc.org/years.html

(Don't worry I didn't make this.)

(I could have found a more suitable program from that list but I'm not THAT bored.)

2009-04-23, 7:39 PM #17

Onimusha

Yo bro!

Posts: 2,295

"They're everywhere, the little harlots."
-Martyn

2009-04-24, 12:47 AM #18

Jedi Legend

Doesn't Sleep Welll

Posts: 1,380

Originally posted by Emon:

JL, your code just prints "0 0 0 0 0 6"

D'oh! Quick algorithm development fail.

2009-04-24, 12:50 AM #19

Giraffe

Registered User

Posts: 927

Originally posted by BombayZeus:

using only nested for-loops.

HAI GUYZ. LETZ TEECH OBJECT OREE ENTED PROGRAMMXORZ WITH PROCEDURAL CONSTRUCTS LOLZ!!!!

Seriously, "only using nested for"s isn't C# programming. What an absolutely ridiculous restriction. If I ever saw any of my colleagues writing nested for-loops I would give them a slap upside the head and send them back to OO school.

(Just to be clear, I understand that's the assignment and you don't have a choice. That rant is directed at your teacher. One of the problems with the software industry today is that the vast majority of software developers writing OO code have no idea of the fundamental principles of OO, and end up writing procedural code with a "public class {}" wrapped around it.)

2009-04-24, 12:56 AM #20

Jon`C

Admiral of Awesome

Posts: 18,626

Originally posted by Giraffe:

If I ever saw any of my colleagues writing nested for-loops I would give them a slap upside the head and send them back to OO school.

...Iterating over a two-dimensional array?

2009-04-24, 1:02 AM #21

Jon`C

Admiral of Awesome

Posts: 18,626

Unless you are seriously suggesting that the teacher should be telling his students, who apparently find an assignment such as this one challenging, to construct a custom iterator object for a two-dimensional array instead of mastering a simple concept such as a nested for loop.

Also, if you really think a loop is a "procedural construct" I think the designers of Smalltalk would like to have a word with you.

2009-04-24, 1:12 AM #22

dr0id

Registered User

Posts: 62

Originally posted by Giraffe:

What an absolutely ridiculous restriction.

Not if the teacher is trying to tech a specific topic?

Originally posted by Giraffe:

If I ever saw any of my colleagues writing nested for-loops I would give them a slap upside the head and send them back to OO school.

Whats so wrong with nested loops? OO or not.

dr0id

2009-04-24, 1:38 AM #23

Freelancer

Peelancer

Posts: 15,012

Guess what's running under the hood of all that OO stuff you're advocating?

It's pretty silly to condemn nested for loops when you use abstractions powered by nested for loops, don't you think?

"it is time to get a credit card to complete my financial independance" — Tibby, Aug. 2009

2009-04-24, 1:39 AM #24

Jedi Legend

Doesn't Sleep Welll

Posts: 1,380

The method's code executes in order until it meets a return statement (or runs out of code)... that's so procedural.

2009-04-24, 1:59 AM #25

Jon`C

Admiral of Awesome

Posts: 18,626

here is my solution, I hope it's OOP enough: http://codepad.org/WNYMrt7w

2009-04-24, 5:06 AM #26

The Ego Has Landed

Posts: 5,876

Hey. That code can't iterate over floats. What sort of lousy generic programming is that?

2009-04-24, 7:45 AM #27

Darth

heh.

Posts: 2,763

He's obviously not taking full advantage of C# and .NET 3.5. He should be required to find his solution use a complex entity data model as well as a WCF service.

:colbert:

2009-04-24, 7:03 PM #28

Malus

Insert Custom Title Here

Posts: 1,180

Originally posted by Jon`C:

here is my solution, I hope it's OOP enough: http://codepad.org/WNYMrt7w

Here is my recursive OCaml version, since loops are apparently evil now:

Code:

mini[~/ocaml 166] cat table.ml 
let rec cols n m =
	if n > 0 then (
		print_int 0;
		cols (n - 1) m
	) else if m > 0 then (
		print_int m;
		cols n (m - 1)
	) else
		print_endline "";;

let rec rows n m =
	if m > 0 then cols n m;
	if n > 0 then rows (n - 1) (m + 1);;

let build_table n =
	rows n 0;;

let main =
	build_table 6;;

main;;
mini[~/ocaml 167] ocamlc table.ml 
mini[~/ocaml 168] ./a.out 
000001
000021
000321
004321
054321
654321

[This message has been edited. Deal with it.]