Multiplication tables
Produce a formatted multiplication table of the kind memorised by rote when in primary school.
Only print the top half triangle of products.
Multiplication tables
You are encouraged to solve this task according to the task description, using any language you may know.
You are encouraged to solve this task according to the task description, using any language you may know.
ALGOL 68
<lang Algol>main:(
INT max = 12; STRING empty cell = " "; FORMAT fmt = $zz-d$;
print(" x"); FOR col TO max DO printf((fmt, col)) OD; print (new line);
FOR row TO max DO printf((fmt,row)); FOR col FROM 1 TO row-1 DO print(empty cell) OD; [row:max]INT product; FOR col FROM row TO max DO product[col]:=row*col OD; printf((fmt, product, $l$)) OD
)</lang> Output:
x 1 2 3 4 5 6 7 8 9 10 11 12 1 1 2 3 4 5 6 7 8 9 10 11 12 2 4 6 8 10 12 14 16 18 20 22 24 3 9 12 15 18 21 24 27 30 33 36 4 16 20 24 28 32 36 40 44 48 5 25 30 35 40 45 50 55 60 6 36 42 48 54 60 66 72 7 49 56 63 70 77 84 8 64 72 80 88 96 9 81 90 99 108 10 100 110 120 11 121 132 12 144