Win a copy of Pragmatic AI this week in the Artificial Intelligence forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Jeanne Boyarsky
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
Sheriffs:
  • Paul Clapham
  • Junilu Lacar
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Ganesh Patekar
  • Tim Moores
  • Pete Letkeman
  • Stephan van Hulst
Bartenders:
  • Carey Brown
  • Tim Holloway
  • Joe Ess

Nested For Loops - understanding them  RSS feed

 
Ranch Hand
Posts: 126
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I've been trying to understand just how nested for loops work , so I thought i'd devise a simple one of my own, as in the code below:-

The thing is, I think the comments i've inserted next to the loops are indicative of their function , but, for example, how can I change this code, so that the word 'two', appears twice, i.e., like
one
one
two
two
I suppose this all stems from my misunderstanding of the whole concept, right?
(Marilyn added code tags to preserve formatting)
[ December 01, 2002: Message edited by: Marilyn de Queiroz ]
 
Sheriff
Posts: 9087
12
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Code to print
one
one
two
two
would look like:

[ December 01, 2002: Message edited by: Marilyn de Queiroz ]
 
author
Sheriff
Posts: 8978
19
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Notice that Marilyn 'unnested' the inner-most for loop to get 'two' to print twice in a row. Think of the nested loops as wheels on an odometer. The outer loop is the most significant number (leftmost), and the inner-most loop is the least significant (in this case the tenths of a mile). The farther right the digit, the more often it spins before the leftmost (outer) loops will increment.
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!