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+21 votes
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What will be the output of the following C program segment?

 char inChar = 'A';
    switch ( inChar ) {
       case 'A' : printf ("Choice A \n");
       case 'B' :
       case 'C' : printf ("Choice B");
       case 'D' :
       case 'E' :
       default : printf ("No Choice"); 
    }
  1. No Choice
  2. Choice A
  3. Choice A
    Choice B No Choice
  4. Program gives no output as it is erroneous
asked in Programming by Boss (16.1k points)
edited by | 2k views

3 Answers

+30 votes
Best answer

There is a `space` in between the `\` and `n`.  (see-Q-no.-3)

case 'A' : printf ("Choice A\ n");                            ^

So, output of the given program is:

Choice A nChoice BNo Choice 

Which includes:

'n'

And there is no new line or spaces between outputs. Hence, there is no option matching.

http://stackoverflow.com/questions/33694700/im-missing-something

answered by Veteran (413k points)
edited by
+7
But in GATE mark was given for all.
+1
@Mithilesh Good eye :) (y)
+1
I believe output should be
Choice A

NO Choice

since inChar, 'A' is not equal to case constant, 'C' present in switch expression , "Choice B" wouldn't get printed

 

Pls clarify

Note : Marks were given for all in answer key of Gate exam
0
0

Arjun sir WHAT WE DO IN GATE EXAM IF THERE IS NO OPTION MATCHED.....????? 

0
@Arjun Suresh Sir, If there were no space between / and n, then will option C be correct answer?
0
yes.
0

@srestha..... no,even if If there were no space between / and n, then also option c would not be correct answer.

@Arjun sir.. pls.verify this

correct ans would have been

Choice A

Choice B

i have taken this pic from dennis ritchie

+5
That statement is correct -- default will execute if no other case matches. But it does not say that default won't be executed if some other case matches.

Actually when some case matches all statements which follows are executed ignoring any labels. We have to explicitly use "break" to avoid this.
0
ok sir....now i got it...default case is for the situation when case does not matches...but it can be executed even if any case matches.
+2
Why '\' after A is not in the output in case of correct output ?
0
@Arjun sir pls correct question ,there is no space between this progam
0

Why '\' after A is not in the output in case of correct output ?

??

0

@jatin khachane 1 "\" followed by something are predefined.

\ is a non printable character. If you want to print it, you have to do "\\".

Here "\ " has no meaning.

+11 votes
There is no break statement in  any case . If a case doesn’t contain break, then all the subsequent cases are executed until a break statement is found. That is why everything inside the switch is printed.

so ans is C
answered by Active (3.7k points)
+1 vote

Answer: Option C

There is no break statement after case A, if there is no break statement then it will execute all the subsequent cases. So it will execute all those print statements. Hence option C. 

To know more about Switch statement refer this: https://www.geeksforgeeks.org/interesting-facts-about-switch-statement-in-c/ it will clear all the doubts.

 

answered by (457 points)
Answer:

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