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# addcomma - put commas in numbers
# input: a number per line
# output: the input number followed by
# the number with commas and two decimal places
{ printf("%-12s %20s\n", $0, addcomma($0)) }
function addcomma(x, num) {
if (x < 0)
return "-" addcomma(-x)
num = sprintf("%.2f", x) # num is dddddd.dd
while (num ~ /[0-9][0-9][0-9][0-9]/)
sub(/[0-9][0-9][0-9][,.]/, ",&", num)
return num
}
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