2022年C语言基础知识归纳2 .pdf

.1/9 C 语言基础知识1.每个 C 程序有且只有一个主函数main()，且程序必须从main()函数开始执行，并在main()函数中结束。2.在 C 语言中，用e 来表示科学计数法时，规定在e 的前面必须有数字，后面必须为整数。3.用单引号括起来的一个字符常量只能存放一个字符；C 语言中没有字符串变量，只能用字符数组来存储字符串。4.外部变量在编译时由系统分配永久的内存空间，所以外部变量的类型不是自动存储类别。5.在一个函数内的复合语句中定义的变量，只能在这个复合语句范围内有效。6.用 sizeof(int)计算 int 类型数据的字节数。7.C 语言运行时，首先系统检查语法的正误，再运行程序的语法；语言中，可以在一个函数中嵌套一个函数，但是不能在一个函数中定义一个函数；只有在函数外部定义的函数才是外部函数；语言的子程序有过程和函数两种。8.预处理命令行的位置没有规定，只是习惯放在前面；在源文件中的可以有多条预处理命令，但一行只能写一条；宏名的大写只是习惯性的表示；宏替换不仅不占用运行时间还不分配内存空间。9.函数的作用是检查文件是否结束，当结束时返回的值为非零，否则为零。.2/9 10.当定义了数组后，在给其赋值时，不能直接把字符串赋给数组名。11.在赋值表达式中，赋值运算符“”右侧不能为表达式；在求余运算符中的两侧都必须为整型；在强制类型转换时，类型名应用括号括起来。12.静态局部变量，只有当程序结束后，其值才释放。13.当调用函数时，实参是一个数组名，则向函数传送的是数组每一个元素的地址。14.算法的特点为有零个或多个输入，有一个或多个输出，当相同的输入时，其结果相同；算法正确的程序最终一定会结束。15.在 C 语言中，预处理命令行都以“#”开头；当需要时才用#include;预处理的作用就是实现宏定义和条件编译。16.当数组元素的下标超出了定义的下标范围时，系统不给出“下标越界”的字样，而是得出错误的答案，因此在编程时务必检查下标是否越界。17.共用体变量不能作为函数的参数，也不能使函数带回共用体变量。18.指向函数的指针变量的定义形式为：数据类型（*指针变量）（）；，因此其为指向函数的指针变量。19.用 C 语言编写的代码程序是源程序，只有通过编译、连接才能进行。20.在说明为 static 时，其生存期得到延长，而其作用域并没有改文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3 .3/9 变，在定义后系统会自动帮它赋值为0，static 为关键字不能被用作它用。21.频繁地使用空语句会降低程序的可读性和运算速度。22.运算符%两边都应是整数，赋值语句左边应该是变量，而非表达式，强制转换语句强制类型应加括号。23.在逻辑运算符中，其两侧的运算符对象为任意合法的表达式即可。24.函数 fread（&Iarray，2,16，fp）的功能是，从fp 所指的数据文件中读取 16 次 2 字节的数据存储到数组Iarray 中。25.整个流式文件也可以随机存取数据，C 语言文件中有好多函数可以达到写入数据时，未经输入数据，达到不覆盖的目的，在进行写操作时，系统会自动关闭文件。26.使用 putchar、getchat、puts、gets、printf、scanf 函数时，必须在程序的开头出现包含头文件#include”stdio.h”的命令行，而使用字符串处理函数时，必须在程序的开头出现包含头文件#include”string.h”命令行，而使用数学函数时，必须在程序的开头出现包含头文件#include”math.h”的命令行。27.一个斜杠与小于等于127 任意数字按一个字符计算，一个斜杠与任意一个字符按一个字符计算。28.一个 C 程序可以有一个或多个程序文件，也可以有一个或多个函数，所以一个C 语言程序可以实现多种算法。29.根据 C 语言规定，注释语句可以换行写，并且一个“/*”和文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3 .4/9 其后紧跟的第一个“*/”中间的部分是注释内容，且注释内容不参与程序的运行。例如：b=0;/*b=20;给 b 赋值*/则 b=0；。30.sizeof 是求字节数的运算符，包括0，而 strlen 是求字符串的实际长度的函数，不包括0，以 0作为结束。31.在函数声明时，其中的形参变量、个数、函数的类型必须一致。32.C 语言源程序经编译后生成后缀为.obj 的目标程序；C 程序经过编译、连接步骤之后才能形成一个真正可执行的二进制机器指令文件；用C 语言编写的程序称为源程序，它以ASCII代码形式存放在一个文本文件中。并不是源程序中的所有行都参加编译。在条件编译形式下，相关内容只在满足一定条件时才进行编译。33.switch 括号后的表达式可以使任何表达式；case 后的表达式必须是常量表达式，常量表达式中不能出现变量，且类型必须是整数、字符型或枚举型。34.C 程序必须由一个或一个以上的函数组成；函数调用可以作为一个独立的语句存在；若函数有返回值，必须通过return语句返回。35.在 C 语言中，数据只能从实参单向传递给形参，称为“按值”传递。【在实参传递到形参时，是数值传递，而不是地址传递，形参中值的改变不会影响实参中的值。】36.可以用 typedef 声明新的类型名来代替已有的类型名，而不能文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3 .5/9 增加新的类型。37.在没有限制输出宽度时，一般浮点数的小数位数是6 位，不管输出格式是%f 或 lf%均如此。38.C 语言中，函数的隐含存储类别是无存储类别。39.当实参传递到形参时，地址传递时形参的改变影响实参。40.串的长度指的是串中的字符的个数，且其字符个数可以为零。41.C 语言中数据类型有整型、实型、字符型等，实行数据分为单精度型和双精度型两种。42.整型数组只能一个一个地输入或输出，而在字符型数组中可以对字符串整体地输入与输出。43.C 语言中，文件型指针变量的定义形式为：FILE*文件型指针名；。C 语言中对二进制文件的访问速度比文本文件快；C语言中，随机文件以二进制代码形式存储数据；C 语言中的文本文件以 ASCII 码形式存储数据。44.因为#define 是宏定义的标志，而不是C 语句，而 printf 是输出函数，因此其是C 语句。45.在实参传递给形参时，地址传递时能够改变，而数值传递时则不变。46.在 scanf函数中，必须含有输入项，并且需含有与之一一对应的转换说明符，在 scanf 函数的格式字符前可以加入一个正整数指定输入数据的宽度，但不可以实数指定小数位的宽度，输入项是地址表达式。文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3 .6/9 47.switch 语句使用注意事项：（1）switch 语句与 if 语句不同，仅能判断一种关系：是否恒等；（2）switch 语句中 case子句的常量可以使整型常量、字符型常量、枚举型数据，或是整型常量表达式，不允许变量；（3）在同一个switch 中，case子句的常量不能相同，在嵌套的switch 语句中，不同层次的switch 之间，可有相同的常量；（4）default 子句可以省略。例如：default：printf（“En”）；（5）case和 default 子句只能在switch 语句中使用，且case和 default 只起标号作用，可出现在 switch 中的任何位置；（6）case和 default 子句后面的语句序列允许由多个可执行语句组成，且不必用“”括起来，也可以为空语句；（7）switch 语句中可省略break语句，但省略后会改变流程。48.break 语句是限定转向语句，它使流程跳出所在的结构，把流程转向所在结构之后。continue 语句被称为继续语句。该语句的功能是使本次循环提前结束，即跳过循环体中continue 语句后面尚未执行的循环体语句，继续进行下一次循环的条件判别。49.在 C 语言中，一个程序必须有一个main（）函数，但是其文件就不一定，因为其可以通过链接来实现多个子函数放到这个主函数中，主函数的位置是不固定的，可以根据自己的爱好和习惯来使用，在C 语言中任何函数都不能调用主函数，且与函数的位置有关。在 C 程序的函数中不能定义另一个函文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3 .7/9 数。50.在用 fprintf 输入时，要将其转换为二进制数形式放到文件中。51.由 C 语言构成的指令序列称为C 源程序，源程序文件的后缀为“.c”。而目标程序为“.obj”，可执行程序为“.exe”。52.在 C 语言中，合法的标识符可以由字母、数字和下划线组成，且第一个字符必须为字母或下划线。53.C 语言规定必须以main 作为主函数名。程序要从 main（）函数开始执行，最后在main（）函数中结束。54.赋值运算符左侧的操作数必须是一个变量。55.在 C 语言中，函数的实参单元与形参单元在内存中分配不同的存储单元。56.在一个 C 语言源程序文件中所定义的全局变量，其作用域为：由具体定义位置和extern 说明来决定范围。【全局变量是在函数外部任意位置上定义的变量，它的作用域是从变量定义的位置开始，到整个源文件结束止。当全局变量定义在后，引用它的函数在前时，应该在引用它的函数中用extern 对此全局变量进行说明，以便通知编译程序该变量是一个已在外部定义了的全局变量，这时全局变量的作用域从extern 说明处起，延伸到该函数末尾。】57.C 语言中，凡是以“#”号开头的行，都成为“编译预处理”。对 C 原程序进行编译前，由编译预处理程序对这些变异预处理命令进行处理。文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4O1 ZM6Z4T10A8N3文档编码:CG4T8H9S9C6 HN2J1N1C4