Kotlin新手入门指南：从零开始学习Kotlin

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《Kotlin Apprentice》是由Irina Galata、Joe Howard、Richard Lucas和Ellen Shapiro共同编写的，这是一本专门为初学者设计的Kotlin编程入门书籍。它由知名网站raywenderlich.com提供，版权归属Razeware LLC，强调了所有内容的原创性和保护性，未经版权所有者事先书面许可，不得复制或分发任何形式的文本、图像或源代码。本书以"Kotlin Apprentice"为名，强调了在学习过程中，读者将逐步掌握这门强大的编程语言，适合那些希望步入Kotlin编程世界的新手。作者Irina Galata是一名软件开发人员，来自乌克兰的Dnipro，她的热情和专业使本书更具实践性和吸引力。书中可能包含基础概念讲解、实例操作演示以及针对Kotlin语法和特性的深入剖析，帮助读者建立起坚实的编程基础。此外，由于本书遵循“按需提供，不提供任何形式保证”的原则，这意味着它提供的软件和源代码是在“原样”基础上，没有任何种类的保证，包括但不限于适销性、特定用途适用性以及不侵犯知识产权等。因此，作者和版权所有者不对因软件使用或交易而产生的任何索赔、损失或其他责任负责。书中还提及了商标问题，明确指出所有在书中的商标和注册商标均为各自所有者的财产，体现了尊重知识产权的立场。《Kotlin Apprentice》是一本旨在通过实用教程和实例，引导读者从零开始学习Kotlin的资源，适合那些希望在IT领域发展，尤其是对移动应用开发感兴趣的学习者。对于Kotlin新手来说，这本书将是一个宝贵的指导工具，帮助他们快速上手并逐步提升技能。

About the cover

The parrot has long captured the eye and imagination of humans; from Aesop to Monty

Python, from ancient Peruvians to swashbuckling pirates, the beautiful plumage of

parrots have made them a recurring theme throughout history.

The expressiveness and mimicry of parrots is very much akin to Kotlin; Kotlin takes the

best of many languages and “mimics" those languages in a modern and expressive way.

Although Kotlin won’t whistle a tune or ride on your shoulder when you cosplay Long

John Silver, Kotlin will still be a great companion to you as you sail the seven seas of

programming!

raywenderlich.com

Representing numbers

As you know by now, numbers are a computer’s bread and butter, the fundamental basis

of everything it does. Whatever information you send to the compiler will eventually

become a number. For example, each character within a block of text is represented by a

number. You’ll learn more about this in Chapter 3, which delves into types including

strings, the computer term for a block of text.

Images are no exception. In a computer, each image is also represented by a series of

numbers. An image is split into many thousands, or even millions, of picture elements

called pixels, where each pixel is a solid color. If you look closely at your computer

screen, you may be able to make out these blocks. That is unless you have a particularly

high-resolution display where the pixels are incredibly small! Each of these solid color

pixels is usually represented by three numbers: one for the amount of red, one for the

amount of green and one for the amount of blue. For example, an entirely red pixel

would be 100% red, 0% green and 0% blue.

The numbers the CPU works with are notably different from those you are used to.

When you deal with numbers in day-to-day life, you work with them in base 10,

otherwise known as the decimal system. Having used this numerical system for so long,

you intuitively understand how it works. So that you can you can appreciate the CPU’s

point of view, consider how base 10 works.

The decimal or base 10 number 423 contains three units, two tens and four

hundreds:

In the base 10 system, each digit of a number can have a value of 0, 1, 2, 3, 4, 5, 6, 7, 8 or

9, giving a total of 10 possible values for each digit. Yep, that’s why it’s called base 10!

But the true value of each digit depends on its position within the number. Moving

from right to left, each digit gets multiplied by an increasing power of 10. So the

multiplier for the far-right position is 10 to the power of 0, which is 1. Moving to the

left, the next multiplier is 10 to the power of 1, which is 10. Moving again to the left, the

next multiplier is 10 to the power of 2, which is 100. And so on.

This means each digit has a value ten times that of the digit to its right. The number

423 is equal to the following:

(0 * 1000) + (4 * 100) + (2 * 10) + (3 * 1) = 423

Kotlin Apprentice Chapter 2: Expressions, Variables & Constants

raywenderlich.com

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