2基本算法语句[定.pdf

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1、基本算法语句一、基本概念（一）输入语句、输出语句、赋值语句：1.输入语句：在某些算法中，变量的初始值要根据情况经常地改变，一般我们把程序和初始数据分开，在每次算题时，即使初始数据改变，也不必改变程序部分，只要每次程序运行时，输入相应的数据即可.这个过程在程序语言中，用“输入语句”来控制.格式：INPUT“提示内容”；变量例如：INPUT“x=”；x 说明：（1）输入语句的功能是实现算法的输入变量信息.（2）输入语句要求输入的是具体的常量.（公式，运算都不行）（3）对于输入语句的格式：INPUT“提示内容”；变量.其中“提示内容”与变量之间必须用分号“；”隔开，“提示内容”的主要作用是能够让程序

2、运行者更清楚地在计算机屏幕上看到程序指令，以便更方便、精确的输入相应变量值.例如：INPUT“X=”;Y INPUT“Y=”;X Z=2X PRINT“Z=”;Z 结果应为第二次输入的数的2 倍，即提示内容中的文字是给人看的，而不是给计算机看的.（4）输入语句可以给多个变量赋值.正确：INPUT“提示内容1，提示内容2，提示内容3，,”；变量 1，变量 2，变量 3，,例如：INPUT“x,y,z=”;x,y,z 错误：INPUT“A=”;A,“B=”;B（5）变量是指在运行时其值是可以变化的量，QB不支持中文提示.2.输出语句：任何求解问题的算法，都要求把求解的结果“输出”.由此可知任何程序

3、语言也必须由“输出语句”来控制输出，不同的程序语言都有自己的输出语句和表现形式，但功能都时一样的，就是以某种形式把求解结果“输出”出来.格式：PRINT“提示内容”；表达式例如：PRINT“S=”;S说明：（1）输出语句的作用式实现算法的输出结果功能.（2）表达式式指程序要输出的数据.（3）上述两种语句“提示内容”也可以不写，即格式为：PRINT x(4)如同输入语句一样，输出语句也可以一次完成输出多个表达的功能正确：PRINT“提示内容1，提示内容2，提示内容3，,”；变量 1，变量 2，变量 3，,PRINT“提示内容1”；变量 1，“提示内容2”；变量 2，“提示内容3”；变量 3，,例

4、如：PRINT“x,y,z=”;x,y,z PRINT“A=”;A,“B=”;B 注意：用分号隔开的部分也可以用逗号隔开，区别是：用逗号时，后一个表达式的值和前一个表达式之间的间隔大一些；当两个表达式之间的分隔符用分号时，后一个表达式的值紧跟在迁移个输出项之后输出（5）输出语句可以输出常量、变量、表达式的值以及字符,输出语句兼有计算和显示的双重功能.也可以没有任何输出项，起到换行或输出一个空行的作用.例如：PRINT 3+5 PRINT 8 PRINT A PRINT“YES”3.赋值语句：在表述一个算法是，经常引入变量，并赋给该变量一个值.用来表明赋给某一个变量具体的确定的值的语句叫赋值语句

5、.格式：变量=表达式例如：a=3,a=a+1,y=3x+2 说明：（1）变量：是指在运行期间可以改变的量，它在每一个时刻有一个确定的值.（2）每个变量都有变量名，其命名规则是：由以英文字母开头，后面可以跟英文字母、数字和小数点，不能含空格.例如：A,C,MP4，都是正确的，而像68，3AB，1B1，M+，等都是非法的.（3）变量名大小写通用，即A 和 a 代表的是同一变量.（4）命名原则应该是“常用从简，专用从繁，见名知义”，以便于编程和交流.一般变量名应与物理，数学的形式相同.比如用 NAME 代表姓名，SUM 代表求和，AVER代表平均值.（5）对简单变量来说，程序中每出现一个简单变量名，

6、系统就会自动给它分配相应的存储单元，用以存放变量的值.变量被赋值后，在存储单元中一直保留到对它的重新赋值为止.例如：x=1 x=x+1 x=x*x PRINT x结果应为4（6）赋值号左右不能对换.赋值语句是将赋值号右面的表达式的值赋值给赋值号左面的变量.例如：x=1 y=2 x=y(y=x)PRINT x,y 2 2(1 1)（7）赋值号左面只能是单个变量，不能是表达式，例如：A+1=A(错)（8）在一个赋值语句中只能给一个变量赋值，不能出现两个或多个赋值的“=”（9）注意理解输入语句与赋值语句的区别.输入语句是在编完程序后，在运行的过程中输入变量的值，可以不必修改程序而进行多组数的计算；赋

7、值语句是在编程的过程中输入的变量值，无法灵活改变，需修改程序.（10）同一行写多个语句式要用冒号将语句分开.常见形式：（1）赋予变量常数值：x=1 (2)赋予变量其它变量或表达式的值：a=b（3）将含有变量自身的表达式赋予变量：i=i+1 程序语句中的符号变化：（，*）（，/）(取商，)(53=1)(,=)(,)等文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1

8、I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档

9、编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1

10、I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档

11、编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1

12、I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档

13、编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3（二）条件语句：人们对计算机的要求不仅仅是一

14、些简单的代数运算，而是经常需要计算机按照条件进行分析、比较、判断，并按照判断后的不同情况进行不同的操作和处理.如“判断一个数的正负”，“比较两数大小关系”等.要解决这些问题计算机就需要用到条件语句.条件语句就是处理条件分支逻辑结构的算法语句.（1）IF-THEN格式（一个分支的条件结构）格式：IF 条件 THEN 语句体END IF 例如：找出三个数中的最大数Input“a1,a2,a3=”;a1,a2,a3 max=a1 if a2max then max=a2 end if if a3max then max=a3 end if print“the max number is:”;max

15、说明：条件表示判断的条件，步骤A 表示满足条件时执行的操作内容，条件不满足时，结束条件语句，转而执行其它语句，end if表示条件语句的结束.（2）IF-THEN-ELSE格式（两个分支的条件结构）格式：IF 条件 THEN 语句体 1 ELSE 语句体 2 END IF 例如：求一元二次方程20(0)axbxca的实根(有根前提下)input“please input a,(a0):”;a input“please input b:”;b input“please input c:”;c det=b2-4*a*c p=-b/(2*a)q=sqr(abs(det)/（2*a）if det=0

16、then print“x1=x2=”;p else print“x1=”;p+q,“x2=”;p-q end if 说明：计算机执行这种形式的条件语句时，首先对IF 后的条件进行判断，如果（IF）条件符合，那么（THEN）步骤 A，否则（else）执行步骤B.思考：如何用两种语句编写程序求x 的绝对值的程序？满足条件？步骤A是否满足条件？步骤A步骤 B是否文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文

17、档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E

18、1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文

19、档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E

20、1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文

21、档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E

22、1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3（

23、3）条件语句的嵌套（多个分支）格式：IF 条件 1 THEN 语句体 1 IF条件 2 THEN 语句体 2 ELSE 语句体 3 END IF ELSE 语句体 4 END IF 例如：已知函数2221,0()21,024,0 xxfxxxxx，试编写程序，输入x 的值，输出y 的值.input x if x0 then y=2*x2-1 else if x=0 then y=2*x+1 else y=-2*x2+4 end if end if print y end 说明：在编写条件语句的嵌套中的“条件”时，要注意“IF”与“END IF”的配对，有时可以利用文字的缩进来表示嵌套的层次.（

24、三）循环语句：在程序处理中，经常需要对一条或一组语句重复执行多次，以最终完成某项任务，这就是循环的概念.（1）直到型（UNTIL型）循环语句格式：DO 循环体LOOP UNTIL 条件说明：计算机执行UNTIL 语句时，先执行DO和 LOOP UNTIL 之间的循环体，然后判断条件是否成立，如果不成立，执行循环体.这个过程反复执行，直到某一次符合条件为止，这时不再执行循环体，跳出循环体执行LOOP UNTIL后面的语句.满足条件 2语句体 2语句体 3是否满足条件 1？是否语句体 1语句体 4满足条件？是否循环体 A文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L

25、3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA

26、4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L

27、3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA

28、4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L

29、3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA

30、4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L

31、3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3例如：编写一个程序，计算13599的值.S=1 i=3 DO S=S*i i=i+2 LOOP UNTIL i99 PRINT S END（2）当型（WHILE型）循环语句格式：WHILE 条件循环体WEND 说明：计算机执行次程序时，遇到WHILE语句，先判断条件是否成立，如果成立，则执行WHILE和 WEND 之间的循环体，然后再判断上述条件，再次执行循环体，这个过程反复执行，直到某一次不符合条件为止，这时，不再执行循环体，将跳到

32、WEND 语句后面，执行WEND 后面的语句.例如：编写一个程序，计算13599的值.S=1 i=3 WHILE i=99 S=S*i i=i+2 WEND PRINT S END 说明：（1）当型循环先判断后执行，直到型循环先执行后判断.（2）当型循环用WHILE型语句，是当满足条件时执行循环体；直到型循环用UNTIL 语句，是不满足条件时执行循环体.（3）对同一算法来说，当型循环和直到型循环的条件互为反条件.（4）当型语句与直到型语句一般情况下可以相互转化.（3）循环语句的嵌套在一个循环体内又完整地包含了另一个循环的，成为循环的嵌套.前面介绍的两种类型的循环可以互相嵌套.我们通常把循环嵌套

33、在外层（程序执行时先执行的）循环语句叫外循环，把循环嵌套在外循环里面（程序执行时后执行的）的循环语句叫做内循环.例：编写一个程序，求1!2!10!，其中!123nn满足条件？否是循环体 A文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:C

34、Z1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7

35、T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:C

36、Z1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7

37、T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:C

38、Z1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7

39、T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3法一：利用“当循环”（利用!(1)!nnn）第一步：输入i=1,S=0,m=1 第二步：i 从 1 循环到 100，用mmi,求出 i!,用 S=S+m 表示前 i 项和；

40、第三步：循环结束，输出S 的值i=1 S=0 m=1 WHILE i=100 m=m*i S=S+m i=i+1 WEND PRINT S END 法二：利用循环嵌套sum=0 i=1 WHILE i=10 j=1 t=1 WHILE j=i t=t*j j=j+1 WEND sum=sum+t i=i+1 WEND PRINT sum END 循环嵌套的形式：（1）WHILE+WHILE 格式WHILE 条件 1 WHILE 条件 2 WEND WEND 文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2

41、ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N

42、3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2

43、ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N

44、3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2

45、ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N

46、3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2

47、ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3(2)UNTIL+UNTIL格式DO,DO,LOOP UNTIL 条件 2,LOOP UNTIL 条件 1（3）WHILE+UNTIL格式WHILE 条件 1 DO,LOOP UNTIL 条件 2,WEND(4)UNTIL+WHILE 格式DO,WHILE 条件 2,WEND,LOOP UNTIL 条件 1（4）FOR-NEXT 循环（了解）格式：FOR =TOSTEP（也有写成FOR FROMTOSTEP）NEXT 例如：求20！的值P=1 FOR i=20 TO 1 STEP-1 P=P*

48、i NEXT i PRINT“20!=”;P END 说明：（1）重复执行循环体“2113表 达 式表 达 式表 达 式”次.（2）三个表达式分别表示初值、终值和步长，步长为1 时可省略（3）FOR-NEXT 循环一般用来解决循环次数固定的问题，也就是说，通过给定的问题，如果我们能够给出循环控制变量的初值，终值和步长，可以考虑使用该循环结构.文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1

49、N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2

50、 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1N3V7K4L8 HA4E1I2F7T2 ZE2Y9O5V8L3文档编码:CZ1