please need help .. with swith and conditional operator?

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please need help .. with swith and conditional operator?

 
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  #1
Oct 29th, 2007
hi ..

please can anyone help me with this .. i need it today

i wanna to do swith with this .. can i or not?

if ( x>y )
cout<< " x is bigger ";
else
cout<< " y is bigger ";

--
and i wanna to do conditional operator with more than 2 expressions .. can i do that?
and is that write or wrong?

grade == 'A' ? "ex" : grade == 'B' ? "v.g" : grade == 'c' ? "g" : undefined letter

thanx
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Re: please need help .. with swith and conditional operator?

 
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  #2
Oct 29th, 2007
Both should work.
Personally, I prefer to use lots of parentheses to make it obvious (both to myself and to the compiler) what exactly I mean to say:
C++ Syntax (Toggle Plain Text) 
  1. cout << (
  2.   (grade == 'A') ? "excellent" : (
  3.     (grade == 'B') ? "very good" : (
  4.       (grade == 'c') ? "good" : "not so good at all" )))
  5.   << endl;
Hope this helps.
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Re: please need help .. with swith and conditional operator?

 
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  #3
Oct 29th, 2007
switch( x>y ) { ... } ?
I blag!?
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Re: please need help .. with swith and conditional operator?

 
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  #4
Oct 29th, 2007
Duoas .. thanx alot ..

---
twomers .. i don't understand ?

please any one answer me in q1
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Re: please need help .. with swith and conditional operator?

 
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  #5
Oct 29th, 2007
Sure. Boolean is an ordinal type.
C++ Syntax (Toggle Plain Text) 
  1. switch (x < y) {
  2.   case true:
  3.     // hmm, x < y
  4.     break;
  5.   case false:
  6.     // wait, x >= y
  7.   }


[EDIT] man, too slow again...

No prob DREAMER546 :-)
Last edited by Duoas; Oct 29th, 2007 at 3:51 pm.
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Re: please need help .. with swith and conditional operator?

 
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  #6
Oct 29th, 2007
thanx aloot really .. because i read in the book the swith just take a constant integral expression i were think when we put < is wrong ..
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Re: please need help .. with swith and conditional operator?

 
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  #7
Oct 29th, 2007
All this: "I wanna do this by using that is nonsense."

As long as you use something that you understand it doesn't matter honey!
Last edited by iamthwee; Oct 29th, 2007 at 4:23 pm.
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Re: please need help .. with swith and conditional operator?

 
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  #8
Oct 29th, 2007
yeah i know that we show use what we understand .. but there's questions that request to solve it by a define way .. so that i'm asking for another way ..
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Re: please need help .. with swith and conditional operator?

 
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  #9
Oct 29th, 2007
Yoinks, iamthwee, at least she is asking to learn...

This is an expression: x > y. It evaluates to an integral (aka ordinal) value (specifically, a bool), which is what the switch statement takes. So when you say
switch (something) {
as long as something evaluates to an integral expression then the switch will work just fine.

Nobody uses switch for boolean expressions because it is faster and easier to read just to use an if. The if, btw, also takes an integral expression. If zero, it is understood as false. If non-zero, it is understood as true.

Hope this helps.
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Re: please need help .. with swith and conditional operator?

 
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  #10
Oct 29th, 2007
Duoas .. really thanks alooot .. that's help me alot
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