blob: 4ec7da6595d12119553995321c29071b70546431 (
plain)
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let indent = " ";
let line = indent . replace (/ /g, "-");
let spacing = " ";
//
// Read STDIN. Split on newlines, filter out empty lines,
// split each line on white space, then call "show"
//
require ("fs")
. readFileSync (0) // Read all.
. toString () // Turn it into a string.
. split ("\n") // Split on newlines.
. filter (_ => _ . length) // Filter out empty lines.
. map (_ => _ . split (/\s+/))
. map (_ => show (_ [0], _ [1]))
;
//
// Return a number, padded with space to the required width.
// If width is less than the length of n, bad things may happen.
//
function format_n (n, width) {
return (indent + n) . substr (-width);
}
//
// Do the main work
//
function show (A, B) {
let P = A * B;
let w_A = ("" + A) . length;
let w_P = ("" + P) . length;
let tick = String . fromCodePoint (0x2713);
while (A) {
process . stdout . write (format_n (A, w_A) + spacing +
format_n (B, w_P) + " " +
(A % 2 ? tick : "") + "\n");
A = Math . floor (A / 2);
B = B * 2;
}
process . stdout . write (indent . substr (-w_A) + spacing +
line . substr (-w_P) + " +\n");
process . stdout . write (indent . substr (-w_A) + spacing +
P + "\n");
}
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