2022年C语言复习知识点总汇 .pdf
名师整理精华知识点关键字 就是已被 C 语言本身使用,不能作其它用途使用的字。例如关键字不能用作变量名、函数名等由 ANSI 标准定义的 C 语言关键字共 32 个:auto double int struct break else long switch case enum register typedef char extern return union const float short unsigned continue for signed void default goto sizeof volatile do if while static 根据关键字的作用,可以将关键字分为数据类型关键字和流程控制关键字两大类。1 数据类型关键字A 基本数据类型(5 个)void:声明函数无返回值或无参数,声明无类型指针,显式丢弃运算结果char:字符型类型数据,属于整型数据的一种char ch=A;int:整型数据,通常为编译器指定的机器字长float:单精度浮点型数据,属于浮点数据的一种double:双精度浮点型数据,属于浮点数据的一种B 类型修饰关键字(4 个)名师整理精华知识点short:修饰 int,短整型数据,可省略被修饰的int。long:修饰 int,长整形数据,可省略被修饰的int。signed:修饰整型数据,有符号数据类型unsigned:修饰整型数据,无符号数据类型C 复杂类型关键字(5 个)struct:结构体声明union:共用体声明enum:枚举声明typedef:声明类型别名sizeof:得到特定类型或特定类型变量的大小D 存储级别关键字(6 个)auto:指定为自动变量,由编译器自动分配及释放。通常在栈上分配static:指定为静态变量,分配在静态变量区,修饰函数时,指定函数作用域为文件内部register:指定为寄存器变量,建议编译器将变量存储到寄存器中使用,也可以修饰函数形参,建议编译器通过寄存器而不是堆栈传递参数extern:指定对应变量为外部变量,即在另外的目标文件中定义,可以认为是约定由另外文件声明的对象的一个“引用”文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6名师整理精华知识点const:与 volatile合称“cv 特性”,指定变量不可被当前线程/进程改变(但有可能被系统或其他线程/进程改变)volatile:与 const 合称“c v 特性”,指定变量的值有可能会被系统或其他进程/线程改变,强制编译器每次从内存中取得该变量的值2 流程控制关键字A 跳转结构(4 个)return:用在函数体中,返回特定值(或者是 void 值,即不返回值)void xxx()continue:结束当前循环,开始下一轮循环break:跳出当前循环或switch 结构for()外循环 break(1);for()内循环 break(3)break(2);文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6名师整理精华知识点 goto:无条件跳转语句B 分支结构(5 个)if:条件语句else:条件语句否定分支(与if连用)switch:开关语句(多重分支语句)case:开关语句中的分支标记default:开关语句中的“其他”分治,可选。C 循环结构(3 个)for:for 循环结构,for(1;2;3)4;的执行顺序为 1-2-4-3-2.循环,其中 2 为循环条件do:do 循环结构,do 1 while(2);的执行顺序是 1-2-1.循环,2 为循环条件while:while 循环结构,while(1)2;的执行顺序是 1-2-1.循环,1 为循环条件以上循环语句,当循环条件表达式为真则继续循环,为假则跳出循环。C 源程序的结构特点:1.一个 C 语言源程序可以由一个或多个源文件组成。文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6名师整理精华知识点2.每个源文件可由一个或多个函数组成。3.一个源程序不论由多少个文件组成,都有一个且只能有一个main函数,即主函数。4.源程序中可以有预处理命令(include 命令仅为其中的一种),预处理命令通常应放在源文件或源程序的最前面。5.每一个说明,每一个语句都必须以分号结尾。但预处理命令,函数头和花括号“”之后不能加分号。6.标识符,关键字之间必须至少加一个空格以示间隔。若已有明显的间隔符,也可不再加空格来间隔。C 语言的运算符和运算顺序这是学好 C 程序设计的基础,C 语言的运算非常灵活,功能十分丰富,运算种类远多于其它程序设计语言。运算符按优先级不同分类,C 程序设计运算符可分为 15 种优先级,从高到低,优先级为1 15,除第 2、3 级和第 14 级为从右至左结合外,其它都是从左至右结合,它决定同级运算符的运算顺序.结构化程序的三种基本结构1)顺序结构2)分支结构分支结构的程序设计方法的关键在于构造合适的分支条件和分析程序流程,根据不同的程序流程选择适当的分支语句。分支结构适合文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6名师整理精华知识点于带有逻辑或关系比较等条件判断的计算,设计这类程序时往往都要先绘制其程序流程图,然后根据程序流程写出源程序,这样做把程序设计分析与语言分开,使得问题简单化,易于理解。程序流程图是根据解题分析所绘制的程序执行流程图。下面介绍几种基本的分支结构。if(条件)分支体 这种分支结构中的分支体可以是一条语句,此时“”可以省略,也可以是多条语句即复合语句。它有两条分支路径可选,一是当条件为真,执行分支体,否则跳过分支体,这时分支体就不会执行。如:要计算 x 的绝对值,根据绝对值定义,我们知道,当x=0 时,其绝对值不变,而x0 时其绝对值是为 x 的反号,因此程序段为:if(x=0时,方程有两个实根,否则(b2-4ac=0)x1=(-b+sqrt(d)/2a;x2=(-b-sqrt(d)/2a;printf(“x1=%8.4f,x2=%8.4fn”,x1,x2);else r=-b/(2*a);i=sqrt(-d)/(2*a);printf(“x1=%8.4f+%8.4fin”r,i);printf(“x2=%8.4fn”r,i)嵌套分支语句:其语句格式为:if(条件 1)分支 1;else if(条件 2)分支 2 else if(条件 3)分支 3 else if(条件 n)分支 n else 分支 n+1 嵌套分支语句虽可解决多个入口和出口的问题,但超过3 重嵌套后,文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6名师整理精华知识点语句结构变得非常复杂,对于程序的阅读和理解都极为不便,建议嵌套在 3 重以内,超过 3 重可以用下面的语句。switch 开关语句:该语句也是多分支选择语句,到底执行哪一块,取决于开关设置,也就是表达式的值与常量表达式相匹配的那一路,它不同 if else 语句,它的所有分支都是并列的,程序执行时,由第一分支开始查找,如果相匹配,执行其后的块,接着执行第 2 分支,第 3 分支的块,直到遇到 break语句;如果不匹配,查找下一个分支是否匹配。这个语句在应用时要特别注意开关条件的合理设置以及break语句的合理应用。(3)循环结构:循环结构可以减少源程序重复书写的工作量,用来描述重复执行某段算法的问题,这是程序设计中最能发挥计算机特长的程序结构,C 语言中提供四种循环,即goto 循环、while 循环、do while 循环和 for循环。四种循环语句可以用来处理同一问题,一般情况下它们可以互相代替换,但一般不提倡用goto循环,因为强制改变程序的顺序经常会给程序的运行带来不可预料的错误,在学习中我们主要学习while、dowhile、for 三种循环。常用的三种循环结构学习的重点在于弄清它们相同与不同之处,以便在不同场合下使用,这就要清楚三种循环的格式和执行顺序,将每种循环的流程图理解透彻后就会明白如何替换使用,如把 while 循环的例题,用 for 语句重新编写一个程序,文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5H2C2V6文档编码:CQ9H10I4G1R7 HE9T5C4K9N2 ZN10H5