Threaded Mode | Linear Mode

***drdebcol*** · 02-05-2010, 11:04 PM

This is an interesting task. You need to input a number "n" that represents number of lines, like on the picture :
[Image: 38227_linesofnumberstask.jpg]

That is simple algorithm, though the biggest problem is to make a Equilateral Triangle and not Right Triangle.
I made it with 3 for loops, two inside of one, but it can be made with one too.
Here is the solution in TPW :

Code:

program lines_of_numbers;

uses wincrt;

var

i,j,n:integer;

s:string;

begin

 readln(n);

 s:='';

 for i:=1 to n-1 do

   s:=s+' ';

 for i:=1 to n do

   begin

    write(s);

     for j:=i downto 1 do

       write(j);

     if i>1 then

       for j:=2 to i do

        write(j);

     writeln;

     s:=copy(s,1,length(s)-1);

   end;

end.

And here is picture of the solution in TWP for n=9 :
[Image: 38228_linesofnumberstpwsolution.jpg]

Also code in C++ :

Code:

# include <iostream>

# include <cstdio>

# include <string>

using namespace std;

int main()

{

   int i,j,n;

   cin>>n;

   string s;

   s="";

   for (i=0;i<n;i++)

     s+=" ";

    for (i=1;i<=n;i++)

      {

         cout<<s;

         for (j=i;j>=1;j--)

           cout<<j;

         if (i>1)

           for (j=2;j<=i;j++)

             cout<<j;

         cout<<endl;

         s=s.substr(0,s.length()-1);               

      } 

    cout<<endl;

    system("pause");

}

And how solution should look like for n=9 :
[Image: 38226_linesofnumberscppsolution.jpg]

That's all, i hope that you like this small task !!!

codecaine · (This post was last modified: 02-06-2010 12:52 PM by codecaine.)

here a python example I did I used center for formating Smile

Code:

import sys;

from string import center;

tempStr = "";

tri = int(raw_input("Enter in a number: "));

for x in xrange(1,tri+1): #loop through inputted number

    for b in xrange(x,1,-1): #loop backwards

        tempStr = tempStr + str(b);

    for f in xrange(1,x+1): #loop fowards

        tempStr = tempStr + str(f);

    print center(tempStr,tri*3); #print the result with center spacing 

    tempStr = ""; #empty string for next loop

PHP Code:

Enter in a number: 20
                             1                              
                            212                             
                           32123                            
                          4321234                           
                         543212345                          
                        65432123456                         
                       7654321234567                        
                      876543212345678                       
                     98765432123456789                      
                   109876543212345678910                    
                 1110987654321234567891011                  
               12111098765432123456789101112                
             131211109876543212345678910111213              
           1413121110987654321234567891011121314            
         15141312111098765432123456789101112131415          
       161514131211109876543212345678910111213141516        
     1716151413121110987654321234567891011121314151617      
   18171615141312111098765432123456789101112131415161718    
 191817161514131211109876543212345678910111213141516171819  
2019181716151413121110987654321234567891011121314151617181920 

***drdebcol*** · 02-06-2010, 06:08 PM

Very good code, also it is short !