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2

I often forget what I wanted to say when the teacher calls on me to speak. Can you make me a tool to solve this?

Requirements:

  • The program must loop as follows:
    • First, take in input
    • If the input is empty, print the last stored question.
    • Otherwise, store the input as a question.

Notes:

  • The input will never be empty if there are no questions stored.

Remember, this is , so the code with the smallest number of bytes wins.

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10 Answers 10

up vote 9 down vote

Perl, 13 17 +1 = 18 bytes

$/eq$_?$;=$_:say$

+1 for the -n flag (saved 1 byte thanks to @Dada)

As long as the input is not equal to the carriage return, it stores the input in $;. If it is equal to the carriage return, it prints what's already in $;.

This assumes that all input can be characterized as questions, even if grammatically, they are not such.

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You probably wanted to write ne instead of eq (right now this doesn't work). – Dada 4 hours ago
1  
You can save three byte by doing /./ instead of $/ne$_ ;-) – Dada 4 hours ago
up vote 6 down vote

05AB1E, 12 11 10 bytes

Thanks @daHugLenny and @Adnan for 1 byte!
Thanks @Emigna for 1 byte!

[IDõQiX,ëU
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1  
I can't test now, but I think you can remove the last character. – daHugLenny 12 hours ago
1  
Yes, you can remove the last bracket (it will be auto-completed). – Adnan 5 hours ago
2  
If you replace ® and © with X and U, you don't need the backslash. – Emigna 35 mins ago
up vote 4 down vote

Haskell, 49 bytes

g s=getLine>>=(#s)
""#s=putStr s>>g s
l#s=g l
g""

How it works: start with g "". The parameter s of function g is the question in store. g reads the next line from stdin and passes it (and also s) to #. If the line is empty, # prints the store and calls g again. If the line is not empty, g is called with the line as the new store.

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up vote 2 down vote

JavaScript, 36 34 31 bytes

for(;;b?a=b:alert(a))b=prompt()

An infinite loop keeps asking for input and stores it in b. It the input is not empty it's then stored in a, otherwise the value of a is printed.

Saved 2 bytes thanks to @ETHproductions

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Nice answer. You can save a byte by removing the 1, and another by moving b?a=b:alert(a) into the last section within the for-loop (i.e. for(a=0;;b?a=b:alert(a))b=prompt()) – ETHproductions 10 hours ago
    
In fact a=0 is not necessary neither. Since the input can only be empty if there are questions stored, a won't be referenced if it hasn't been assigned. – Oriol 10 hours ago
up vote 1 down vote

reticular, 12 bytes

id""E[$dp]~*

Try it online!

Explanation

id""E[$dp]~*
i             take a line of input     [input]
 d""E         push equality with ""    [input, input == ""]
     [$dp]    push that func           [input, input == "", [$p]]
         ~*   execute it iff equal
              on equal:
      $       drop empty input
       dp     duplicate then print the TOS
              this wraps around to the beginning, taking another line of input
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up vote 1 down vote

Python3 - 49 bytes

s=""
while 1:
 b=input()
 if b:s=b
 else:print(s)
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1  
NameError: name 'b' is not defined – shooqie 3 hours ago
    
@shooqie Ah, I typed this with my phone so I accidentally left out b=input(). Thanks! – TuukkaX 2 hours ago
up vote 0 down vote

Pyke, 6 bytes

z=z~zr

Try it here!

     r - while 1:
z      -   input() or z.contents
 =z    -  z.contents = ^
   ~z  -  z.contents
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up vote 0 down vote

Python 3, 34 bytes

s=""
while[print(s)]:s=input()or s
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up vote 0 down vote

Mathematica, 44 bytes

If[(b=InputString[])=="",Print@a,a=b]~Do~∞

Full program. The Unicode character is U+221E INFINITY for \[Infinity].

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up vote 0 down vote

CMD, 37 bytes

set/p a=
if %a%.=. echo b
set a=%b%
c

in a file names c.cmd or 

set/p a=
if %a%.=. echo b
set a=%b%
%0

in any file

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