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C语言入门指南
2022-07-06 09:20:00 【三万行先生】
系列文章目录
第二章 C语言学习框架及简单代码
前言
有了C语言学习工具本章将会给大家大脑里搭建一个C语言学习框架
一、C语言内容
C语言所包含内容简单分类如下:
1.关键字 2.操作符 3.分支和循环语句 4.函数 5.数组 6.指针
7.结构体 8.文件操作
(其中关键字和操作符会在具体的代码块中讲解)
二、简单代码
1.简单输入输出
代码如下(示例):
#include <stdio.h> int main() { printf("hallo"); return 0; }
代码块解析:
如图中1.
在C语言程序中必须包含一个主函数也就是main函数,因为C语言程序从mian函数开始,也是在main函数结束,缺少main函数程序就无法执行,所有main函数的重要性也不言而喻。
如图中2.
printf 是一个输出函数利用printf可以将双引号内的内容打印在屏幕上运行结果如下:
总结
一切程序都是从main函数开始,从main函数结束
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