objective-c学习 day-01(C部分)

最新推荐文章于 2025-08-14 17:54:27 发布

转载最新推荐文章于 2025-08-14 17:54:27 发布 · 85 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/binbinyelling/p/3507315.html

文章标签：

#xcode

本文介绍了C语言的基础知识，包括C语言的特点、Objective-C的特性、如何安装苹果开发者工具Xcode，以及C语言中变量声明、条件判断等基本语法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

getting start with C:

C programmers write code in the C language, and a C compiler converts the C code into machine code.
The Objective-C programming language is based on C, but it adds support for object-oriented programming.

Installing Apple's developer tools

The main application that you will need is called Xcode.

Select Application from the OS X section, then choose Command Line Tool.

4. You can see and set the different options for code completion in Xcode's preferences. Select Xcode -->Preferences and then open the Text Editing preference.

Ⅱ.How Programming Works

In a program, you create a new variable by declaring its type and name.

  float weight;

Here is an overview of the commonly used types:

    short, int, long, float, double, char, pointer, struct BOOL

if/else:

In C, it was decided that 0 would represent false, and anything that is not zero would be considered true.

if(condition){
    //Execute this code if the conditional evaluates to true
}else{
    //Execute this code if the conditional evaluates to false
}

Boolean variables

Too use BOOL in a C function, like main(), you would need to include in your program the file where this type is defined:

#include <objc/objc.h>

challenge:

int i = 20;
int j = 10;
int k = (i > j) ? 10 : 5;

===>

int i = 20;
int j = 10;
if (i>j)
{
    int k = 10;
}else{
    int k = 5;
}

转载于:https://www.cnblogs.com/binbinyelling/p/3507315.html