Search:

If the modifications made are correct,then the result will be correct.
If the modifications made are incorrect,then the result will be incorrect.

First make the code do what you want it to do and...

The question is not clear to me.You are allowed to modify your own code.You write it :p

I suggest you take a second look at case 91.

The performance is affected by the heaviest operation of your code.This is that you read the file and then you read it again...The ascii code does not play a role in your's code performance.
Aslo...

Can you please post the updated code? :)

Also it would be nice to use '+' for example than the ascii code.

Edit : Also at case 91 you manipulate the counter of the external loop.This is a...

You do not initialize length to zero.You should initialize it to zero.

Same story for p .I do not know with which value you want to initialize it.Probably with zero.