c语言程序设计习题集答案

1、.第12章 C语言概述、算法、数据类型、运算符与表达式一、选择题ACDBB CCDCB D 二、填空题1、n=202、a=66,b=E第3章 顺序程序设计一、选择题BAAD二、程序阅读1、12 24 0 122、2,3,2,2 3、0 三、编程1#include <stdio.h>#include <math.h>void main()int a,b,c;float s,area;scanf("%d,%d,%d",&a,&b,&c);s=(a+b+c)/2.0;area=sqrt(s*(s-a)*(s-b)*(s-c);pri

2、ntf("a=%f,b=%f,c=%f,s=%f,area=%f",a,b,c,s*2,area);2#include <stdio.h>#include <math.h>void main()float a,b,c,del,x1,x2;scanf("%f,%f,%f",&a,&b,&c);del=b*b-4*a*c;if (del>=0)x1=(-b+sqrt(del)/(2*a);x2=(-b-sqrt(del)/(2*a);printf("x1=%f,x2=%f",x1,x2

3、);elseprintf("没有 实根");3#include <stdio.h>void main()int c,f;printf(“input c:n”); scanf(“%d”,&c);f=9.0/5.0*c+32;printf("%d的华氏温度是%d",c,f);3.2 选择结构程序设计一、选择题DBBCD C二、程序阅读1、 |a|+|b|=612、 PQ3、 -14、 606960Error!5、 0,16、 a+b+c=15三、编程1#include <stdio.h>void main()int a,b,c

4、,min;scanf("%d,%d,%d",&a,&b,&c);min=a;if (min>b) min=b;if (min>c) min=c;printf(“%d,”,min);2#include <stdio.h>void main()int a;scanf("%d",&a);if(a%3=0 && a%5=0 && a%7=0)printf("yes");elseprintf("no");3#include <std

5、io.h>#include <math.h>void main()float x,y;scanf("%f",&x);if (x<0)y=fabs(x);else if(x>=0 && x<=2)y=sqrt(x+1);else if (x>=2 && x<4)y=pow(x+2,3);elsey=2*x+5;printf("x=%f,y=%f",x,y);4#include <stdio.h>void main()float rate,tax,salary

6、;scanf("%f",salary);if(salary<=850)rate=0;else if(salary>1350 && salary<=2850)rate=0.1;else if(salary>2850 && salary<5850)rate=0.15;elserate=0.2;tax=rate*(salary-850);printf("salary=%f,rate=%f,tax=%f",salary,rate,tax);3.3 循环控制一、 填空题：1.22 2.23 3. 46

7、4.117二、 选择题：CDBBB CCCBD三、 程序阅读：1、 输出：332、 输出：243、 2#4#7#11#16#4、 3#2#0#0#1#5、 BADC6、 DABC7、 BCAD8、 ADBC9、 CCA10、 BDA11、 ADC四、编程1#include <stdio.h>#include <math.h>void main() int x; printf("x sqrt(x)n"); for(x=5;x<=1000;x+) printf("%d %fn", x, sqrt(x);2#include<

8、stdio.h>#include<math.h>main()int i,flag;double pi,item;i=1;flag=1;pi=0;item=1.0;while(fabs(item)>=0.00001)item=flag*1.0/i;pi=pi+item;flag=-flag;i=i+2;pi=pi*4;printf("pi=%f",pi);3教材126页例6.84#include<stdio.h>main() int i,a,b,c; a=1;b=1; printf("%d %d ",a,b); for(

9、i=3;i<=10;i+) c=a+b; printf("%d ",c); a=b; b=c; 第4章 数组一、 选择题：DDADC CDBDB DDDAB 二、 程序填空：ABBDCDABBBDCACDCA1#2#3#1#1#3298三、 编程：1、#include <stdio.h>void main( )int mark, a, p, f;a = p = f = 0; printf("Enter scores:");scanf ("%d", &mark); while (mark >0) if(m

10、ark >= 85) a+; else if (mark >= 60) p+; else f+; scanf ("%d", &mark); printf(">=85:%dn", a);printf("60-84:%dn", p);printf("<60:%dn", f);2、#include <stdio.h>void main( )int a10,count=0,i;float average,sum=0;for(i=0;i<10;i+)scanf("%

11、d",&ai);sum=sum+ai;average=sum/10;for(i=0;i<10;i+) if(ai>average) count=count+1;printf("平均值为%f 大于平均值的数有%d个",average,count);3#include<stdio.h>main( ) int a10; int i,j,t,n;printf(“请输入一个正整数n（1<n10）：”);scanf(“%d”,&n); for (i=0; i<n; i+) scanf("%d",&

12、ai); printf("n"); for (j=0; j<n-1; j+) /*确定基准位置 */ for(i=j+1; i<n; i+) if (aj>ai) t=aj;aj=ai;ai=t; printf("The sorted numbers: n");for (i=0; i<n; i+) printf("%d",ai); 4#include <stdio.h>void main()int a66,n,i,j,x,y,max; printf(“请输入一个正整数n（1n6）：”);scanf(

13、“%d”,&n);printf(“请输入一个n行n列的矩阵：n”); for (i=0;i<n;i+) for (j=0;j<n;j+)scanf(“%d”,&aij);max=a00; x=0;y=0;for (i=0;i<n;i+) for (j=0;j<n;j+) if (fabs(aij)>max) max=aij;x=i;y=j;printf(“绝对值最大的元素为：%d,下标分别为：%d,%dn”,max,x,y);第5章 函数一、 选择题ABCBDC7) BDAC8) DCBA9)DBB10) CCBB二、 程序阅读题（1） 3，5（2

14、） 4（3） s=10（4） 5，257,15三、 程序设计1# include<stdio.h># include<math.h>int isprime(int m) int k, n, res; if(m = 1) return 0; res = 1; n = (int)sqrt(m); for(k = 2; k <= n; k+) if(m%k = 0) res=0; break; return res; void main( )int m,n;int sum=0;int i;doprintf("Input m,n m<n like:3,10

15、n");scanf("%d,%d",&m,&n);while(m<0 | n<0 | m>n);for(i=m;i<=n;i+)if(isprime(i)sum+=i;printf("The all primes' sum is:%dn",sum);2int max_value(int arr4)int i,j,max;max=arr00;for(i=0;i<2;i+)for(j=0;j<4;j+)if(max<aij)max=aij;return max;3# include&

16、lt;stdio.h># include<math.h>int isTheFineNumber(int n)int flag=0;int a,b,c;if(int)sqrt(n)=sqrt(n)/Íêȫƽ·½Êýa=n%10;b=(n/10)%10;c=n/100;if(a=b|b=c|c=a)flag=1;return flag;void main()int n;int i;scanf("%d",&n);for(i=101;i<n;i+)

17、if(isTheFineNumber(i)printf("%dn",i);第7章预处理命令CBBBD DDBC第8章 指针一、选择题：1、 D2、 A3、 D4、 A5、 D6、 B7、 C8、 D9、 B10、 D11、 D二、程序阅读题：1、 C2、 A3、 B4、 C5、 A三、程序设计题：1#include<stdio.h>void main() void swap(int *pointer1,int *pointer2);int *p1,*p2;int a=1,b=2;p1=&a; p2=&b; swap(p1,p2); printf(

18、"%dn%d",a,b); void swap(int *p1,int *p2)int temp; temp=*p1; *p1=*p2;*p2=temp;2#include<stdio.h>void main() int a10,*p1,i,j,temp; p1=a;for(i=0;i<10;i+)scanf("%d",p1+i);for(i=0;i<10;i+)p1=a;for(j=0;j<10-i;j+,p1+)if(*p1>*(p1+1)temp=*p1;*p1=*(p1+1);*(p1+1)=temp;p1=a

19、; for(i=0;i<10;i+,p1+)printf("%d ",*p1);3#include<stdio.h>void main()int upper=0,lower=0,digit=0,space=0,other=0,i=0;char *p,s20;printf("input string:");while(si=getchar()!='n') i+;p=&s0;while(*p!='n')if('A'<=*p)&&(*p<='Z'

20、;)+upper; else if ('a'<=*p)&&(*p<='z')+lower;else if (*p=' ')+space;else if ('0'<=*p)&&(*p<='9')+digit;else +other;p+;printf("upper case is:%d lower case:%d",upper,lower);printf("space: %d digit:%d other:%d",spac

21、e,digit,other);4strmcpy(char s,char t,int m) char *p1,*p2,i; p1=s; p2=t+m; while(*p2!='0') *p1=*p2;p1+;p2+; 5#include<stdio.h>void main()int s44=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16; int *p,i,j,t;p=&s00; for(i=0;i<4;i+)for(j=i;j<4;j+)t=*(p+4*i+j); *(p+4*i+j)=*(p+4*j+i); *(p

22、+4*j+i)=t;第9章 结构体共用体一、选择题：1. D、D、D、D、C2. D3. A4. BC(选项B改为(*p).pk，结果为C)5. D二、选择填空题：1. B2. C三、编程题：1#include<stdio.h>struct int year;int month;int day;date;void main() int days; printf("input year,month,day:n"); scanf("%d%d%d",&date.year,&date.month,&date.day);swit

23、ch (date.month)case 1:days=date.day;break;case 2:days=date.day+31;break;case 3:days=date.day+59;break;case 4:days=date.day+90;break;case 5:days=date.day+120;break;case 6:days=date.day+151;break;case 7:days=date.day+181;break;case 8:days=date.day+212;break;case 9:days=date.day+243;break;case 10:days=

24、date.day+273;break;case 11:days=date.day+304;break;case 12:days=date.day+334;break; if(date.year%4=0&&date.year%100!=0|date.year%400=0) &&date.month>=3)days+=1;printf("%d/%d is the %dth day in %dn",date.month,date.day,days,date.year);2#include<stdio.h>struct int ho

25、ur;int min;int sec;time1,time2,time3;void main() printf("input the first time hour,min,sec:n"); scanf("%d%d%d",&time1.hour,&time1.min,&time1.sec);printf("input the second time hour,min,sec:n"); scanf("%d%d%d",&time2.hour,&time2.min,&tim

26、e2.sec);time3.sec=time2.sec-time1.sec; if(time3.sec<0) time3.sec+=60;time2.sec-; time3.min=time2.min-time1.min; if(time3.min<0) time3.min+=60;time2.min-; time3.hour=time2.hour-time1.hour; printf("timelag is hour:%d min:%d sec:%d ",time3.hour,time3.min,time3.sec);3#include<stdio.h&

27、gt;#define N 5struct studentchar num6;char name6;int score4;stuN;void main() void print(struct student stu6);int i,j;for(i=0;i<N;i+)printf("ninput score of student %d:n",i+1);printf("No.: ");scanf("%s",stui.num);printf("name: ");scanf("%s",stui.na

28、me);for(j=0;j<3;j+)printf("score %d: ",j+1);scanf("%d",&stui.scorej);printf("n");print(stu);void print(struct student stu6)int i,j;printf("n No. name score1 score2score3n");for(i=0;i<N;i+)printf("%5s%10s",stui.num,);for(j=0;j<3;

29、j+)printf("%9d",stui.scorej);printf("n");第10章 文件一、选择题C C B B AC C D D CD D D二、编程1.#include <stdio.h>#include <string.h>void main()FILE *fp;char str80;if(fp=fopen("test.txt","r")=NULL)printf("errorn");while(!feof(fp)fscanf(fp,"%sn",str);if(strstr(str,"for")!=NULL)printf("%sn",str);fclose(fp);2.#include <std