Problem:
Rectangle

Write a program which calculates the area and perimeter of a given rectangle.

Input

The length a and breadth b of the rectangle are given in a line separated by a single space.

Output

Print the area and perimeter of the rectangle in a line. The two integers should be separated by a single space.

Constraints

1 ≤ a, b ≤ 100

Sample Input 1

3 5

Sample Output 1

15 16

Solution in JavaScript (judge verdict: Accepted)

"use strict"
function KP(callback) {
    this.data = [];
    this.reader = require('readline').createInterface({
        input: process.stdin,
        output: process.stdout
    });
    this.id = 0;
    this.start = function(callback) {
        self.reader.on('line', function(line) {
            var dt = line.split(" ");
            for (var i = 0; i < dt.length; ++i) {
                self.data.push(dt[i]);
            }
        });
        self.reader.on('close', function() {
            callback(self);
        });
    }
    this.input = function() {
        var id = self.id++;
        if (id >= self.data.length) {
            self.error("reached eof");
        }
        return self.data[id];
    }
    this.output = function(data) {
        if (arguments.length > 1) {
            data = [];
            for (var i = 0; i < arguments.length; ++i) {
                data[i] = arguments[i];
            }
        }
        else if (typeof data !== "object") {
            data = [data];
        }
        console.log(data.join(" "));
    }
    this.error = function(err) {
        console.error(err);
        console.abort();
    }
    var self = this;
};

new KP().start(function(kp) {
    var a = +kp.input();
    var b = +kp.input();
    kp.output([a*b, (a+b)*2]);
    process.exit(0);
});