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24秋国开电大春四川广播电视大学C语言程序设计形考任务2形考任务2参考答案_1

来源：百年教育职业培训中心　更新时间：2024-09-16 04:14:36

形考任务2_形考任务20形考任务2_形考任务20试卷总分:100得分:76一、选择题（共20分，每小题2分）1.当处理特定问题时的循环次数已知时，通常采用的语句是（???）。A.forB.whileC

形考任务2_形考任务20

试卷总分:100 得分:76

一、选择题（共20分，每小题2分）

1. 当处理特定问题时的循环次数已知时，通常采用的语句是（??? ）。

A. for

B. while

C. do-while

D. switch

答案:

2.在switch语句的每个case块中，假定都是以break语句结束的，则此switch语句容易被改写成的语句是（??? ）。

A. for

B. if

C. do

D. while

答案:

3.for语句能够被改写成的语句是（??? ）。

A. 复合国家开放大学作业答案

B. if

C. switch

D. while

答案:

4.下面循环语句执行结束后输出的i值为（??? ）。

for(int i=0; i<n; i++) if(i>n/2) {cout<<i<<endl; break;}

A. n/2

B. n/2+1

C. n/2-1

D. n-1

答案:

5.在下面循环语句中，内层循环体S语句的执行总次数为（??? ）。

for(int i=0; i<n; i++)

??????????? for(int j=i; j<n; j++) S;

A. n 2

B. (n+1)/2

C. n(n-1)/2

D. n(n+1)/2

答案:

6.在下面的do循环语句中，其循环体被执行的次数为（??? ）。

int i=0; do i++; while(i*i<10);

A. 4

B. 3

C. 5

D. 2

答案:

7.在下面的一维数组定义中，有语法错误的选项是（??? ）。

A. int a[]={1,2,3};

B. int a[10]={0};

C. int a[];

D. int a[5];

答案:

8.在下面的二维数组定义中，语法正确的选项是（??? ）。

A. int a[5][];

B. int a[][5];

C. int a[][3]={{1,3,5},{2}};

D. int a[](10);

答案:

9.假定一个二维数组的定义语句为“int a[3][4]={{3,4},{2,8,6}};”，则元素a[1][1]的值为（??? ）。

A. 2

B. 4

C. 6

D. 8

答案:

10.假定一个二维数组的定义语句为“int a[3][4]={{3,4},{2,8,6}};”，则元素a[2][1]的值为（??? ）。

A. 0

B. 4

C. 8

D. 6

答案:

二、判断题（共20分，每小题1分。叙述正确则回答“是”，否则回答“否”）

11.在执行“typedef int DataType;”语句后，标识符DataType与保留字int具有完全相同的含义和作用。

答案:

12.在switch语句中，每个case和冒号之间的表达式只能是常量。

答案:

13.为了结束本层循环类语句或switch语句的执行过程，在语句体中需要使用break语句。

答案:

14.在程序中执行到break语句时，将结束所在函数的执行过程，返回到调用该函数的位置。

答案:

15.在程序执行完成任一个函数调用后，将结束整个程序的执行过程，返回到操作系统或C语言集成开发环境界面窗口。

答案:

16.假定一维数组的定义为“char* a[8];”，则该数组所含元素的个数大于8。

答案:

17.假定二维数组的定义为“int a[3][5];”，则该数组所占存储空间的字节数为60。

答案:

18.假定二维数组的定义为“char a[M][N];”，则该数组所含元素的个数为M+N。

答案:

19.假定二维数组的定义为“double a[M][N];”，则每个数组元素的行下标取值范围在0~M-1之间。

答案:

20.假定二维数组的定义为“double a[M][N];”，则每个数组元素的列下标取值范围在0~N之间。

答案:

21.存储一个空字符串需要占用0个字节的存储空间。

答案:

22.使用“typedef char BB[10][50];”语句定义标识符BB为含有10行50列的二维字符数组类型。

答案:

23.存储字符'a'需要占用1个字节的存储空间。

答案:

24.空字符串的长度为1。

答案:

25.字符串"a:\\xxk\\数据"的长度为13。

答案:

26.为了存储一个长度为n的字符串，所使用的字符数组的长度至少为n+1。

答案:

27.strcmp函数用于进行两个字符串之间的比较。

答案:

渝粤题库

28.strcpy函数用于把一个字符串拷贝到另一个字符数组空间中。

答案:

29.一个二维字符数组a[10][20]能够最多存储9个字符串。

答案:

30.一个二维字符数组a[10][20]能够存储的每个字符串的长度不超过20。

答案:

三、填空题：写出下列每个程序运行后的输出结果（共40分，每小题4分）

31.?#include<stdio.h>

?????? void main()

?????? {

?????????? int x=5;

?????????? switch(2*x-3) {

渝粤题库，我们的目标是要做全覆盖、全正确的答案搜索服务。

???????????? case 4: printf("%d ",x);

???????????? case 7: printf("%d ",2*x+1);

???????????? case 10: printf("%d ",3*x-1); break;

???????????? default: printf("%s","default\n");

?????????? }

?????? }

答案:0

32.#include ?????? void main() { ??? ???????int i,s=0; ??? ???????for(i=1;i<=5;i++) s+=i*i; ??? ???????printf("s=%d\n",s); ?????? }

答案:s=55

33.#include ?????? void main() { ?????????? int i, s1=0, s2=0; ?????????? for(i=0;i<10;i++) ?????????????? if(i%2) s1+=i; else s2+=i; ?????????? printf("%d %d\n",s1,s2); ?????? }

答案:25 20

34.#include ?????? void main() { ?? ????????int n=6,y=1; ?????????? while(n) y*=n--; ?????????? printf("y=%d\n",y); ?????? }

答案:y=720

35.#include ?????? const int M=20; ?????? void main() ?????? { ?????????? int i,c2,c3,c5; ?????????? c2=c3=c5=0; ?????????? for(i=1; i<=M; i++) { ?????? ????????if(i%2==0) c2++; ?????????????? if(i%3==0) c3++; ?????????????? if(i%5==0) c5++; ?????????? } ?????????? printf("%d %d %d\n",c2,c3,c5); ?????? }

答案:10 6 4

36.#include ?????? void main() ?????? { ?????????? int i,s; ?????????? for(i=1,s=0;i<10;i++) { ?????????????? if(i%3==0) continue; ?????????????? s+=i; ?????????? } ?????????? printf("%d\n",s); ?????? }

答案:27

37.?#include ?????? void main() { ?????????? int a[8]={12,39,26,41,55,63,72,40}; ?????????? int i, i1=0, i2=0; ?????????? for(i=0;i<8;i++) ?????????????? if(a[i]%2==1) i1++; else i2++; ?????????? printf("%d %d\n",i1,i2); ?????? }

答案:4 4

38.#include ?????? int a[10]={4,5,6,15,20,13,12,7,8,9}; ?????? void main() ?????? { ?????????? int i,s[4]=0; ?????????? for(i=0; i<10; i++) { ?????????????? switch(a[i]%4) { ???????????????? case 0: s[0]+=a[i];break; ???????????????? case 1: s[1]+=a[i];break; ???????????????? case 2: s[2]+=a[i];break; ???????????????? default: s[3]+=a[i];break; ?????????????? } ?????????? } ?????????? for(i=0; i<4; i++) printf("%d ",s[i]); ?????? }

答案:44 27 6 22

39.#include ?????? void main() { ?????????? char a[]="abcdbfbgacd"; ?????????? int i1=0, i2=0, i=0; ?????????? while(a[i]) { ?????????????? if(a[i]=='a') i1++; ?????????????? if(a[i]=='b') i2++; ?????? ????????i++; ?????????? } ?????????? printf("%d %d %d\n",i1,i2,i); ?????? }

答案:2 3 11

40.#include ?????? void main() { ?????????? int a[3][4]={{1,2,7,8},{5,6,10,6},{9,12,3,4}}; ?????????? int m=a[0][0]; ?????????? int i,j; ?????????? for(i=0; im) m=a[i][j]; ?????????? printf("%d\n",m); ?????? }

答案:12

四、简答题：根据下列每个题目要求编写程序（共20分，每小题4分）

41.编写一个函数，函数头格式为“double Mean(double a[M][N],int m,int n)”，要求返回二维数组a[m][n]中所有元素的平均值，假定在计算过程中采用变量v存放平均值。

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mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">double Mean(double a[M][N], int m,int n ){</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""> </spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">double v=0;</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""> </spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">for(int i=0;i<m;i++)</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; 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mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">/*void main()</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">{</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""> </spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">double a[2][3]={1,2,3,4,5,6};</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""> </spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"="">printf("%lf\n",Mean(a,2,3));</spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""> </spanyes';font-family:calibri;mso-fareast-font-family:宋体;><spanyes';font-family:calibri;mso-fareast-font-family:宋体; mso-bidi-font-family:'times="" new="" roman';line-height:150%;color:rgb(0,0,0);="" font-weight:bold;font-size:16.0000pt;mso-font-kerning:1.0000pt;"=""><o:p></o:p></spanyes';font-family:calibri;mso-fareast-font-family:宋体;><!--[if gte mso 9]><xml><w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="260" >

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="List" ></w:LsdException>渝粤题库，我们的目标是要做全覆盖、全正确的答案搜索服务。

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 2 Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 1 Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 1" ></w:LsdException>

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 1" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Shading Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light List Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Grid Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 1 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 2 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 1 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 2 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 1 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Dark List Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 2" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Shading Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light List Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Grid Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 1 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 2 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 1 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 2 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 1 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Dark List Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 3" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Shading Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light List Accent 4" ></w:LsdException>

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 1 Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 2 Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 1 Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Dark List Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 4" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Shading Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light List Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Grid Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 1 Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 2 Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 1 Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 2 Accent 5" ></w:LsdException>

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Dark List Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 5" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Shading Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light List Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Light Grid Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 1 Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Shading 2 Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium List 1 Accent 6" ></w:LsdException>

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<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 1 Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 2 Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Medium Grid 3 Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Dark List Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Shading Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful List Accent 6" ></w:LsdException>

<w:LsdException Locked="false" Priority="99" SemiHidden="false" Name="Colorful Grid Accent 6" ></w:LsdException>

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42.编写一个递归函数“int FF(int a[], int n)”，求出数组a中所有n个元素之积并返回。

答案:  int FF(int a[], int n)   {       if(n==1) return a[n-1];       else return a[n-1]*FF(a,n-1);   }

43.编写一个主函数，利用while循环，求出并显示满足不等式的最小n值。

答案:  #include<stdio.h>   void main()   {       int i=0; double s=0;  //或int i=1; double s=1;       while(s<5) s+=(double)1/++i;       printf("n=%d\n",i);   }

44.编写一个主函数，求出满足不等式2 2 +4 2 +...+n 2 <1000的最大n值，假定分别用i和s作为取偶数值和累加值的变量，并限定使用do循环编程。

答案:  #include<stdio.h>   void main()   {       int i=0;  //用i作为依次取值偶数的变量       int s=0;  //用s作为累加变量       do {           i+=2;           s+=i*i;       }while(s<1000);       printf("n=%d\n",i-2);   }

45.编写一个主函数，计算并输出1 2 +2 2 +...+n 2 值，其中n值由键盘输入。

答案:  #include<stdio.h>   void main()   {       int i;    //用i作为计数（循环）变量       int s=0;  //用s作为累加变量       int n;       printf("输入一个自然数: ");       scanf("%d",&n);       for(i=1; i<=n; i++) s+=i*i;       printf("s=%d\n",s);   }

24秋国开电大春四川广播电视大学C语言程序设计形考任务2形考任务2参考答案_1

来源：百年教育职业培训中心 更新时间：2024-09-16 04:14:36

来源：百年教育职业培训中心　更新时间：2024-09-16 04:14:36