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#!/usr/bin/gawk
# Challenge 002
#
# Challenge #2
# Write a script that can convert integers to and from a base35
# representation, using the characters 0-9 and A-Y. Dave Jacoby came up
# with nice description about base35, in case you needed some background.
function format_number(n, base, negative, output, d) {
if (n < 0) {
negative = 1;
n = -n
}
else {
negative = 0;
}
output = ""
do {
d = n % base;
n = int(n / base);
output = substr(digits, d+1, 1) output;
} while (n > 0)
if (negative)
output = "-" output;
return output;
}
function scan_number(str, base, n, negative, ch, d) {
n = 0;
if (sub(/^-/, "", str))
negative = 1;
else
negative = 0;
while (str != "") {
ch = toupper(substr(str, 1, 1));
str = substr(str, 2);
d = index(digits, ch) - 1;
if (d < 0 || d >= base) {
print "cannot parse '" str "'";
exit(1);
}
n = base * n + d;
}
if (negative)
n = -n;
return n;
}
BEGIN {
BASE = 35;
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
if (ARGV[1] == "-r")
print scan_number(ARGV[2], 35);
else
print format_number(ARGV[1], 35);
exit 0
}
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