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While Loop Not Reading First Integer

Collin Sampson
Greenhorn

Joined: Feb 27, 2012
Posts: 17
This is my code, I am new to java so bear with me. I have to make a program that reads in exam scores and outputs, number of A's, B's...etc. and percentages relatively. I am using a while loop but it is not reading the first score. I input 90 90 90 90 90 60 60 60 60 60 -1(sentinel value) and it outputs that there are 4 A's, and 5 D's. Help!

gimmy kaye
Greenhorn

Joined: Feb 27, 2012
Posts: 2
I miss what this question has to do with servlets.

I think there's something wrong with the logic of yor program.

try this loop:

Tim Hagberg
Greenhorn

Joined: Jan 29, 2010
Posts: 12
The first time you call nextInt() (right before your while loop), you're reading your first number in. Then before you do anything with that value, within the body of the while loop you are calling nextInt() again.
Winston Gutkowski
Bartender

Joined: Mar 17, 2011
Posts: 7807
    
  21

Chaps, please UseCodeTags.

Thanks.

Winston


Isn't it funny how there's always time and money enough to do it WRONG?
Articles by Winston can be found here
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38873
    
  23
That is an idiom you would never guess, ensuring you read the number once per loop.
Winston Gutkowski
Bartender

Joined: Mar 17, 2011
Posts: 7807
    
  21

Collin Sampson wrote:I am using a while loop but it is not reading the first score. I input 90 90 90 90 90 60 60 60 60 60 -1(sentinel value) and it outputs that there are 4 A's, and 5 D's. Help!

I think gimmy covered it, but there is a way of doing that doesn't involve repetition, viz:and, as you can see, you don't have to check for a range every time.

I did wonder what happened to the 'E's though.

Winston

[Edit] Too slow
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38873
    
  23
I added code tags to one post and you can see how much better it looks, but the other wasn’t indented.
Collin Sampson
Greenhorn

Joined: Feb 27, 2012
Posts: 17
Thank you all for your help, I really appreciate it. I see where I went wrong. Sorry im such a noob =D. This is my first loop program and we haven't really covered it yet in class.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38873
    
  23
This is slightly changed from what Winston Gutkowski wrote: . . .

Winston
I have changed that slightly, replacing the continue with an else, so as to maintain structured programming. There, everybody can disagree with me about structured programming

Winston Gutkowski wrote:[Edit] Too slow
I’ve been taking lessons from Rob!
Winston Gutkowski
Bartender

Joined: Mar 17, 2011
Posts: 7807
    
  21

Campbell Ritchie wrote:I have changed that slightly, replacing the continue with an else, so as to maintain structured programming. There, everybody can disagree with me about structured programming

Hey, I grew up with Dijkstra

Removing the continue means that count will include invalid entries, which I assumed was not Collin's intention.

Winston
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38873
    
  23
I missed the count++. Sorry. You would have to put the count++ in {} after the first else. Then it would ignore marks of 101%.
 
It is sorta covered in the JavaRanch Style Guide.
 
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