House of cards (version 1)

Question

Version 2 here.

Simple challenge: given an integer, draw a house of cards with the given number of stories. If the number is negative, draw the house upside-down. Examples:

Input: 2
Output:

 /\
 --
/\/\

Input: 5
Output:

    /\
    --
   /\/\
   ----
  /\/\/\
  ------
 /\/\/\/\
 --------
/\/\/\/\/\

Input: 0
Output: <empty, whitespace or newline>

Input: -3
Output:

\/\/\/
 ----
 \/\/
  --
  \/

Input can be numeric or a string. Output must be exactly as shown, with leading and/or trailing spaces and newlines allowed.

This is code-golf, so may the shortest program/function for each language win!

Answer 1

Python 2, 97 95 94 92 bytes

^{-2 bytes thanks to Luka
This version produces an exception on n=0,but without printing anything}

n=input()*2
m=abs(n)
for i in range(2,m+1)[::n/m]:print(i/2*'/-\-'[i%2::2][::n/m]).center(m)

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Non-error version, Python 2, 94 bytes

n=input()*2
x=n>0 or-1
for i in range(2,x*n+1)[::x]:print(i/2*'/-\-'[i%2::2][::x]).center(n*x)

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Answer 2

05AB1E, 30 29 24 bytes

ÄF„--Nׄ/\N>×}).C∊2ä¹0‹è

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Explanation

ÄF                         # for N in [0 ... abs(input-1)] do:
  „--N×                    # push the string "--" repeated N times
       „/\N>×              # push the string "/\" repeated N+1 times
             }             # end loop
              )            # wrap stack in a list
               .C          # pad strings on both sides to equal length
                 ∊         # vertically mirror the resulting string
                  2ä       # split in 2 parts
                    ¹0‹    # push input < 0
                       è   # index into the the list with the result of the comparison

Answer 3

PHP, 125 bytes

input negative leading newline

input positive trailing newline

for($s=str_pad;++$i<$b=2*abs($argn);)$t.=$s($s("",2*ceil($i/2),["-","/\\"][1&$i]),$b," ",2)."
";echo$argn>0?$t:$t=strrev($t);

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PHP, 130 bytes

for(;++$i<$b=2*abs($a=$argn);)echo($s=str_pad)($s("",2*abs(($a<0?$a:$i&1)+($i/2^0)),["-",["/\\","\/"][0>$a]][1&$i]),$b," ",2)."
";

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Answer 4

MATL, 39 bytes

|:"G|@-:~'/\'G0<?P]@E:)htg45*c]xXhG0<?P

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Explanation

|         % Implicitly input, N. Absolute value
:"        % For k from 1 to that
  G|      %   Push absolute value of N again
  @-      %   Subtract k
  :       %   Range [1 2 ... N-k]
  ~       %   Convert to vector of N-k zeros
  '/\'    %   Push this string
  G0<     %   Is input negative?
  ?       %   If so
    P     %     Reverse that string (gives '\/')
  ]       %   End
  @E      %   Push 2*k
  :       %   Range [1 2 ... 2*k]
  )       %   Index (modularly) into the string: gives '/\/\...' or '\/\/...'
  h       %   Horizontally concatenate the vector of zeros and the string. Zeros
          %   are implicitly converted to char, and will be shown as spaces
  t       %   Duplicate
  g       %   Convert to logical: zeros remain as 0, nonzeros become 1
  45*c    %   Multiply by 45 (ASCII for '=') and convert to char
]         % End
x         % Delete (unwanted last string containing '=')
Xh        % Concatenate into a cell array
G0<       % Is input negative?
?         % If so
  P       %   Reverse that cell array
          % Implicit end. Implicit display

Answer 5

Charcoal, 31 28 27 bytes

ＦＩ⊟⪪θ-«←ι↓→/…\/ι↙»‖Ｍ¿‹Ｎ⁰‖Ｔ↓

Try it online! Link is to verbose version of code. I had about 4 different 32 byte answers then found this. Edit: Saved 3 4 bytes by performing the abs using string manipulation. Explanation:

   ⪪θ-                          Split the input (θ = first input) on -
  ⊟                             Take the (last) element
 Ｉ                              Convert it to a number i.e. abs(θ)
Ｆ     «                         Repeat that many times
       ←ι                       Print half of the -s
         ↓                      Position for the /\s
          →/                    Print the first /
            …\/ι                Print half of any remaining \/s
                ↙               Position for the next row of -s
                 »              End of the loop
                  ‖Ｍ            Mirror everything horizontally
                    ¿‹Ｎ⁰        If the input was negative
                        ‖Ｔ↓     Reflect everything vertically

Answer 6

C (gcc), 169 171 173 160 164 bytes

#define F(A,B,C)for(i=A;B--;)printf(C);
#define P puts("");F(y,i," ")F(abs(n)-y
s,i,x,y;f(n){x=n<0;for(s=x?1-n:n;s--;){y=x?-n-s:s;P,i,x?"\\/":"/\\")y+=x;P,s>x&&i,"--")}}

+13 bytes for negative case bug.

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Ungolfed (207 bytes after removing all spaces and newline):

s, i, x, y;
f(n) {
  x = n < 0;
  for (s = x ? 1 - n : n; s--;) {
    y = x ? - n - s : s;
    puts("");
    for (i = y; i--;) printf(" ");
    for (i = abs(n) - y; i--;) printf(x ? "\\/" : "/\\");;
    y += x;
    puts("");
    for (i = y; i--;) printf(" ");
    for (i = abs(n) - y; s > x && i--;) printf("--");;
  }
}

Answer 7

Gaia, 21 bytes

:┅“/\\“--”צ¦_€|ḣ¤ọ×ṣ

Explanation

:                      Push 2 copies of the input
 ┅                     Get the range to the input. If positive: [1 .. n]. If negative: 
                       [-1 .. n]. If zero: [0].
  “/\\“--”             Push ["/\", "--"]
          צ¦          Repeat both of those strings by each number in the range. Strings go
                       in reverse order when repeated a negative number of times.
             _         Flatten the list
              €|       Centre-align the rows of the list
                ḣ      Remove the last row (the "--"s on the bottom)
                 ¤     Swap (bring input back to the top)
                  ọ    Sign: -1 for negative, 0 for 0, 1 for positive
                   ×   Repeat the list that many times; (-1 × list) reverses it
                    ṣ  Join with newlines and implicitly output

Answer 8

Japt, 40 38 bytes

-2 bytes thanks to @Shaggy

o½½@aXc)ç +"--/\\\\/"ò gYv *Ug)pXc a÷

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Explanation

o½½@aXc)ç +"--/\\\\/"ò gYv *Ug)pXc a÷              // implicit: U = input integer
o.5,.5,XYZ{UaXc)ç +"--/\\\\/"ò gYv *Ug)pXc a} qR    // ungolfed
o.5,.5,                                             // array [.5,U] with step size .5
       XYZ{                                 }       // mapped by the function: (X = value, Y = index)
           UaXc)                                    //   absolute diff between U and ceil(X)
                ç                                   //   " " times that value
                  +"--/\\\\/"ò g      )             //   plus ["--","/\","\/"].get(...
                                Yv                  //     if Y is even, 1, else 0
                                   *Ug              //     times sign(U)
                                       pXc a        //   repeated abs(ceil(X)) times
                                              qR    // all that joined with newlines

Answer 9

Mathematica, 140 bytes

(T=Table;z=Column;B[a_]:=""<>"/\\"~T~a;If[#>0,m=0,m=Pi];z[Join[z/@T[{B@i,""<>"--"~T~i},{i,Abs@#-1}],{B@Abs@#}],Alignment->Center]~Rotate~m)&

Answer 10

Retina, 116 111 105 bytes

this got way too long :/

\d+
$*
+`^~?( *1*)1
 $1¶$&¶_$&
.*$

+`(_.*)1
$1--
1
/\
Ts`/\\`\\/`.*~.*
+`(.*)¶((.*¶)*)(~.*)
$2$4¶$1
~|_

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negative input is denoted as ~n

Answer 11

Perl 5, 100 + 1 (-n) = 101 bytes

$/=$_>0?'/\\':'\\/';push@r,$_=$"x--$q.$/x$_,y|/\\|-|r for 1..($q=abs);pop@r;say for$_<0?reverse@r:@r

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