Code-golf: Output multiplication table to the Console

Answer 1

MATLAB - 10 characters

a=1:9;a'*a

... or 33 characters for stricter output format

a=1:9;disp(num2str(a'*a,'%.2d '))

Answer 2

Ruby - 42 Chars (including one linebreak, interactive command line only)

This method is two lines of input and only works in irb (because irb gives us _), but shortens the previous method by a scant 2 charcters.

1..9
_.map{|y|puts"%02d "*9%_.map{|x|x*y}}

Ruby - 44 Chars (tied with perl)

(a=1..9).map{|y|puts"%02d "*9%a.map{|x|x*y}}

Ruby - 46 Chars

9.times{|y|puts"%02d "*9%(1..9).map{|x|x*y+x}}

Ruby - 47 Chars

And back to a double loop

(1..9).map{|y|puts"%02d "*9%(1..9).map{|x|x*y}}

Ruby - 54 chars!

Using a single loop saves a couple of chars!

(9..89).map{|n|print"%02d "%(n/9*(x=n%9+1))+"\n"*(x/9)}

Ruby - 56 chars

9.times{|x|puts (1..9).map{|y|"%.2d"%(y+x*y)}.join(" ")}

Answer 3

C - 66 Chars

This resolves the complaint about the second parameter of main :)

main(x){for(x=8;x++<89;)printf("%.2d%c",x/9*(x%9+1),x%9<8?32:10);}

C - 77 chars

Based on dreamlax's 97 char answer. His current answer somewhat resembles this one now :)

Compiles ok with gcc, and main(x,y) is fair game for golf i reckon

#define f(i){for(i=0;i++<9;)
main(x,y)f(x)f(y)printf("%.2d ",x*y);puts("");}}

Answer 4

cat - 252 characters

01 02 03 04 05 06 07 08 09

02 04 06 08 10 12 14 16 18

03 06 09 12 15 18 21 24 27

04 08 12 16 20 24 28 32 36

05 10 15 20 25 30 35 40 45

06 12 18 24 30 36 42 48 54

07 14 21 28 35 42 49 56 63

08 16 24 32 40 48 56 64 72

09 18 27 36 45 54 63 72 81

Assuming that a trailing newline is wanted; otherwise, 251 chars.

* runs *

Answer 5

C - 97 79 characters

#define f(i){int i=0;while(i++<9)
main()f(x)f(y)printf("%.2d ",x*y);puts("");}}

Answer 6

Another attempt using C#/Linq with GroupJoin:

Console.Write(
    String.Join(
        Environment.NewLine,
        Enumerable.Range(1, 9)
            .GroupJoin(Enumerable.Range(1, 9), y => 0, x => 0, (y, xx) => String.Join(" ", xx.Select(x => x * y)))
            .ToArray()));