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Logic problem

Tarun Oohri
Ranch Hand

Joined: Feb 20, 2013
Posts: 172
Hi everyone
I am not able to understand this program, It counts the repeated characters in the given string.
Can you tell me how it is doing so, what is the logic behind this.
What 65,91,97,123 denotes here ?
Thanks in advance!!!
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14074
    
  16

Those numbers are character codes (ASCII). It only counts characters in the range 65 to 91 and 97 to 123 (inclusive), which are letters A to Z and a to z, and the characters [ and {. The fact that it includes [ and { is probably a bug. It should have been < 91 and < 123.

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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38031
    
  22
Where did you find that code? It would have been far better to use a method like this than those error‑prone <= operators.
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11161
    
  16

those are what's called "magic numbers", because you have to have some magic to know what they mean. They should be avoided at all cost.


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Randall Twede
Ranch Hand

Joined: Oct 21, 2000
Posts: 4340
    
    2

awesome Campbell! thanks for sharing that for when i might need it!


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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38031
    
  22
You're welcome
 
It is sorta covered in the JavaRanch Style Guide.
 
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