Triangle made with numbers from 1 to 9

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Join Date: Dec 2008
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dr.eu dr.eu is offline Offline
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Triangle made with numbers from 1 to 9

 
0
  #1
Dec 4th, 2008
Hi!

I have to write program, who print Triangle made with numbers from 1 to 9,like this:

1
21
321
4321
54321
654321
7654321
87654321
987654321

I wrote code:
C++ Syntax (Toggle Plain Text) 
  1.  #include <iostream.h>
  2. #include <stdlib.h>
  3.  
  4. int main()
  5. {
  6.  int first, last;
  7.  
  8.  cout << endl;
  9.  
  10.  for (first = 1 ; first <= 9 ; first++)
  11.  {
  12.     cout << " ";
  13.     for (last = 1 ; last <= first; last++)
  14.     {
  15.        cout <<last;
  16.     }
  17.  cout<< endl;
  18.  }
  19.  
  20.  cout << endl << endl << endl;
  21.  system("PAUSE");
  22.  return 0;
  23. }

which put on the screen Triangle in form:
1
12
123
1234
12345
123456
1234567
12345678
123456789

I think, that I need to use if statment to invert numbers, but i dont know how. Any ideas?
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Laiq Ahmed Laiq Ahmed is offline Offline
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Re: Triangle made with numbers from 1 to 9

 
0
  #2
Dec 4th, 2008
Simple replace

cpp Syntax (Toggle Plain Text) 
  1. for (last = 1 ; last <= first; last++)
with
cpp Syntax (Toggle Plain Text) 
  1. for (last = first ; last >=1; --last)

replace the above line and every thing is fine.
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Re: Triangle made with numbers from 1 to 9

 
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  #3
Dec 4th, 2008
YES!!!
IT works!
Thank you Laiq Ahmed!!
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