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本日我想要分享给人人的是C语言法式设计第一章——根基内容类型的数据。本日的主要数据有四部门,分别是常量与变量,简洁的屏幕输出,内容类型和如何较量变量或内容类型所占空间的巨细。Today I want to share with you the first chapter of C programming - the content of basic data types. Today, there are four parts, namely constant and variable, simple screen output, data type and how to calculate the space occupied by variables or data types.
No.1 常量与变量
1.界说变量的一般形式:类型关键字 变量名;
2.关键字(Keyword):C语言预先划定的、具有特殊意义的单词
1. Define the general form of variable: type keyword variable name;
2. Keyword: a word with special meaning that is pre-defined by C language
3.一个C 法式必需且只能有一个用main作为名字的函数,这个函数成为主函数;main后面圆括号内的void透露它没有函数参数;main前面的int透露3.函数执行后会返回操纵体系一个整数型,在main函数的函数体中的最后一条语句使用return语句返回了这个值,平日返回0透露法式正常竣事。
4.C语言允许在界说变量的同时对变量初始化(为其赋初值)
3. A C program must and can only have one function with the name of main, which becomes the main function; Void in parentheses after main means that it has no function parameters; After the function is executed, it will return an integer type of the operating system. The last statement in the body of the main function returns this value with a return statement. Usually, it returns 0, which indicates the normal end of the program.
4. C language allows variables to be initialized (initial value assigned) while defining variables
No.2简洁的屏幕输出
No.3内容类型
5.法式第一行以#开首而未以分号结尾的不是C语句,而是C的编译预处理下令;尖括号内的文件称为头文件,h为head之意,std为standard之意,i为input之意,o为output之意;编译预处理下令#include可使头文件在法式中生效,它的作用是:将写在尖括号内的输入/输出函数的头文件stdio.h包括到用户源文件中。
6.字符串:用一对双引号括起来的几多字符。
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