f2c.js

args = message.getContent().split(" ");
if (args.length != 2) {
    channel.message("No argument");
} else {
    var f = args[1];
    try {
        f = new Number(f);
    } catch (e) {
        channel.message("Invalid number");
    }
    var c = (f - 32) / 1.8;
    channel.message("" + c);
}