Objective-C入门:从C++程序员的角度

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"从C++到Objective-C的中文版教程,旨在帮助已有C++基础的开发者理解和学习Objective-C,尤其强调通过对比C++来探讨Objective-C的高级特性,如类的实现。该教程并非全面手册,而是作为入门指引,介绍Objective-C 2.0的核心概念,并指出Objective-C与Smalltalk的渊源,以及它与C++的区别。Objective-C是Apple平台的主要开发语言,而Cocoa是其在MacOSX开发中的类库框架,与C++和Qt、Java和Spring的关系相似。" 这篇教程的目的是帮助那些已经熟悉C++的程序员更快地掌握Objective-C,利用他们已有的编程经验来理解Objective-C的独特之处。Objective-C是在C语言基础上添加了面向对象特性的语言,受到Smalltalk的影响,具有动态机制。与C++相比,Objective-C更注重动态性,而C++则更强调静态类型检查和性能优化。 Objective-C 2.0是该语言的一个重要版本,本教程以此为基础进行讲解。Smalltalk是Objective-C的灵感来源,是第一个纯面向对象的语言,其影响力体现在Objective-C的语法和设计哲学上。Objective-C的面向对象特性包括消息传递、协议、类别等,这些特性使得它在Apple的生态系统中,尤其是在iOS和macOS的开发中占据了核心地位。 Cocoa是Objective-C用于MacOSX开发的重要框架,它提供了大量的类和接口,使得开发者可以构建强大的应用程序。Cocoa与Objective-C的结合,类似于其他语言与其对应库的组合,如C++与Qt,Java与Spring,都是为了提供一套完整的开发环境和工具集。 教程中提到,虽然不会涵盖所有Objective-C的基础语法,但它将通过与C++的对比,深入讲解一些高级主题,如对象的创建、继承、多态等。这对于已经了解C++的开发者来说,是一个快速进入Objective-C世界的有效途径。通过这个系列的学习,开发者将更好地理解Objective-C的动态特性,并能更有效地利用Objective-C进行实际开发,为进一步深入研究Cocoa和Apple平台的开发打下坚实的基础。
2023-07-22 上传

Create a class called Rational for performing arithmetic with fractions. Use integer variables to represent the private data of the class – the numerator and the denominator. Provide a constructor that enables an object of this class to be initialized when it’s declared. The constructor should store the fraction in reduced form. For example, the fraction 2/4 would be stored in the object as 1 in the numerator and 2 in the denominator. In order to compute the reduced form, you need to write a reduction function which uses the Euclidean algorithm to get the greatest common divisor (GCD) of the numerator and denominator first and then divides GCD to get the reduced numerator and denominator. Provide public member functions that perform each of the following tasks: (a) Subtract a Rational number from the other Rational number. The result should be stored in reduced form. (b) Divide a Rational number by the other Rational number. The result should be stored in reduced form. (c) Print Rational numbers in the form a/b, where a is the numerator and b is the denominator. (d)Compare two Rational numbers to make sure which one is smaller or they are equal. (1 for the first number, 2 for the second number and 0 if they are equal) Please also write a main function to prompt the user to input two Rational numbers . Subtract one number from the other from these two numbers using (a) and then print the result using (c). Divide one number from the other from these two numbers using (b) and then print the result using (c). Compare these two Rational numbers using (d) and indicate which one is smaller or they are equal. 用c++5.11寫出,且使用using namespace std;

2023-06-02 上传