C语言程序设计教材答案

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1、第1章 C语言概述一、选择题123456DCACAC二、填空题1一个主函数 多个2main()3 c obj exe三、程序填空题main()printf四、运行结果 $ AAAAAAAAA SSSSSSSSSSSSSS五、编程题void main()printf(*n);printf(* 请完成以下功能 *n);printf(* 1、进入程序 2、切换用户 *n);printf(* 3、更新程序 4、删除程序 *n);printf(* 请选择（1-4）： *n);printf(*n);第2章 数据类型、运算符、表达式与基本输入输出一、选择题123456789101112131415BDDBA

2、CCACCBCDBAAACA221二、填空题13,12不定值314051，0，0，06-2647888，8，1091三、运行结果题1n=12n=3,a=2,b=3332767,3276847.000000 6 3.000000 2 6.000000 0.00000030.000000 0 0 2 10 5第3章 顺序程序设计一、选择题12345678910DABAADA没有正确选项CCD二、填空题1dec:-1,oct:37777777777,hex:ffffffff,unsigned:42949672952dec:1,oct:1,hex:1,unsigned:13dec:65,oct:41,

3、AXCII:A43.141593,3.14253.500000,3.5631.415920,3.141592e+0017c=K8a=1,b= ,c=29a=12,b=34510c=A三、编程题1 #includevoid main() float r,h,v; scanf(%f%f,&r,&h); v=3.14*r*r*h; printf(v=%fn,v);2 #includevoid main() int n,s=0; scanf(%d,&n); s=(n+1)*(n+2)*n/3; printf(1*2+2*3+.+n(n+1)=%dn,s);3#includevoid main() in

4、t a,b,n=0; scamf(%d%d,&a,&b); n=a/2+b/4; printf(n=%dn,n);4#includevoid main() printf( On); printf(OOOOOOOOOOO000n); printf(O O 0n); printf(O O 0n); printf(OOOOOOOOOOO000n); printf( On);第4章 分支结构程序设计习题解一、选择题12345BDABD二、填空题1缺省 时，else总是与上面最近的、没有匹配过的 if 匹配。2if(a=b) x=1; printf(“ # # # # x=%dn”,x);else y=

5、2; printf(“ * * * * y=%dn”,y); 3根据条件判定值，从两种选择对象中，选取一个作为整个运算的结果4（1）整个条件表达式的结果就取自运算分量b的结果（2）整个条件表达式的结果就取自运算分量c的结果三、程序填空题char grade;gradedefault四、运行结果题11,0,12x=6332334*&五、编程题1#include #include void main( ) float a,b,c,s,s1;printf(Please enter 3 reals:n);scanf(%f%f%f,&a,&b,&c);if(a+b)c&(a+c)b&(b+c)a) s=

6、(a+b+c)*0.5; s1=s*(s-a)*(s-b)*(s-c); s=sqrt(s1); printf(nArea of the triangle is %fn,s);else printf(It is not triangle!n);2#include #define PI 3.14159void main( )int k;float r,c,a;printf(input r,kn);scanf(%f%d,&r,&k);switch(k)case 1: a=PI*r*r; printf(area=%fn,a);break;case 2: c=2*PI*r;printf(circle=

7、%fn,c);break;case 3: a=PI*r*r;c=2*PI*r;printf(area=%f circle=%fn,a,c);break;3#include void main()int year;scanf(%d,&year); if(year%400=0|year%4=0&year%100!=0)printf(%d is a leap yearn,year);else printf(%d is not a leap yearn ,year);4#includevoid main()float score; scanf(%f,&score);if(score=90) print

8、f(A);else if(score=80) printf(B);else if(score=70) printf(C);else if(score=60) printf(D);else printf(E);5#includevoid main( )int num,a,b,c,d,p;scanf(%d,&num);if(num999) p=4;else if(num99) p=3;else if(num9) p=2;else if(num0) p=1;printf(位数是：%dn,p);a=num/1000;b=num/100-a*10;c=num/10-a*100-b*10;d=num%10

9、;switch(p)case 4:printf(%d %d %d %dn,d,c,b,a);break;case 3:printf(%d %d %d n,d,c,b);break;case 2:printf(%d %dn,d,c);break;case 1:printf(%d n,d);第5章 循环结构程序设计习题解一、选择题12345ACCBB二、填空题1 (1)while (2)do-while (3)for2 do-while语句3 for语句4（1）先判断条件是否成立（为真），若成立（为真）再执行循环语句 （2）先执行循环语句，再判断条件是否成立（为真），若成立则继续执行循环，若不成立

10、，则结束循环。do-while至少执行一次循环语句5表达式1； while（表达式2） 表达式3；6（1）结束本次循环，后进行循环的条件判定，即不终止整个循环的执行过程 （2）终止整个循环的执行，不再进行条件判定7一个循环体内包括另一个完整的循环结构8死循环，不能确定次数三、程序填空题118或192c=getchar( )四、运行结果题10 1 1 1 2 22x=8五、编程题1#includevoid main() int i, s=0; for(i=1;i=101;i+=2)if(i-1)%4=0) s+=i; else s-=i;printf(“%d”,s); 2#include #in

11、cludevoid main()long int i,x,y,z;for(i=1;i100000;i+)x=sqrt(i+100); /*x为加上100后开方后的结果*/y=sqrt(i+268); /*y为再加上268后开方后的结果*/if(x*x=i+100&y*y=i+268)printf(n%ldn,i);3#includevoid main() int n,i;printf(nplease input a number:n); scanf(%d,&n); printf(%d=,n);for(i=2;i=n;i+)while(n!=i)if(n%i=0)printf(%d*,i);n=

12、n/i;else break; printf(%d,n); 4#includevoid main()char c;int letters=0,space=0,digit=0,others=0;printf(please input some charactersn);while(c=getchar()!=n)if(c=a&c=A&c=0&c=9) digit+;else others+; printf(all in all:char=%d space=%d digit=%d others=%dn,letters, space,digit,others); 5#include #include

13、void main() int i,n,j,k,m,l=0; for(i=4;i=2000;i+=2) for(n=2;ni;n+) for(j=2,k=1;j=(int)sqrt(n);j+)/*判断n是否素数*/ if(n%j=0) k=0; if(k) /*若n是素数，则继续判断i-n是否素数*/ for(j=2,m=1;j=(int)sqrt(i-n);j+)/*判断i-n是否素数*/ if(i-n)%j=0) m=0; if(m) printf(%d=%d+%d ,i,n,i-n); l+;if (l%5=0)printf (n); break; if(n=i) printf(err

14、or %dn,i);/*n等于i，i不遵循哥德巴赫猜想*/ 6#includevoid main() int day,x1,x2; day=9;x2=1; while(day0)x1=(x2+1)*2;/*第一天的桃子数是第2天桃子数加1后的2倍*/x2=x1;day-; printf(the total is %dn,x1); 7#includevoid main() int i,j,k;for(i=0;i=3;i+)for(j=0;j=2-i;j+) printf( );for(k=0;k=2*i;k+) printf(*);printf(n);for(i=0;i=2;i+)for(j=0

15、;j=i;j+) printf( );for(k=0;k=4-2*i;k+) printf(*);printf(n); 8 #includevoid main()double p=1,t=1,v;int i;for(i=1;i=j;i si+1=si;!=0i+2(ch=sti)ch= word=0n+四、编程题1.#include #define NUM 10void main()int i,count=0;float aNUM,sum=0,aver;for(i=0;iNUM;i+)scanf(%f,&ai);sum+=ai;aver=sum/NUM;printf(The average i

16、s : %.2fn,aver);for(i=0;iaver)count+;printf(the number that is over average is : %dn,count);2.#include #define NUM 10void main()int i;float aNUM,max,min;scanf(%f,&a0);max=a0;min=a0;for(i=1;imax)max=ai;elseif(aimin)min=ai;printf(max=%dnmin=%dn,max,min);3.#include#define NUM 20void main()int aNUM,i;fo

17、r(i=0;iNUM;i+)scanf(%d,&ai);printf(the result is:n);for(i=0;iNUM;i+)if(i%2=0&ai%2=0)printf(%dn,ai);4.#includevoid main()int i,j,sum1=0,sum2=0,sum3=0;float aver;for(i=0;i3;i+)for(j=0;j3;j+)scanf(%d,&ai);for(i=0;i3;i+)for(j=0;j3;j+)printf(%6d,aij);printf(n);for(i=0;i3;i+)sum1+=aij+a2-ii;printf(输出主对角线与

18、次对角线元素的和是:%dn,sum1);for(i=0;i3;i+)sum2+=a1i;printf(输出第二行元素的和是:%dn,sum2);for(i=0;i3;i+)sum3+=ai2;aver=(float)sum3/3;printf(输出第三列元素的平均值是:%.2fn,aver);5#includevoid main()int i,co1=0,co2=0,co3=0,co4=0;char s1000,c;gets(s);for(i=0;(c=ai)!=0;i+)if(c=a&c=A&c=0&c=9)co3+;else co4+;printf(统计字符串中英文字母、空格符、数字字符及

19、其它字符的个数分别是：%d,%d,%d,%dn,co1,co2,co3,co4);6.#include #define N 10void main()int aNN,i,j;for(i=0;iN;i+)ai0=1;aii=1;for(i=2;iN;i+)for(j=1;ji;j+)aij=ai-1j+ai-1j-1;for(i=0;iN;i+)for(j=0;j=i;j+)printf(%6d,aij);printf(n);7.#include void main()int i,j;for(i=0;i5;i+)for(j=0;ji;j+)printf( );for(j=0;j5;j+)prin

20、tf(* );printf(n);第7章 函数与变量一、选择题123456789101112DCBBDADDDAAA二、填空题142double avg(double a,double b)32 114i+1 1三、编程题1#include double cylinder (double r, double h)double result;result =3.1415926 * r * r * h; return result; void main( ) double height, radius, volume;double cylinder (double r, double h); pr

21、intf (Enter radius and height: );scanf (%lf%lf, &radius, &height);volume = cylinder (radius, height ); printf (Volume = %.3fn, volume);return 0;2#include char* fun(char* s, char c)char* t = s;char* f = s;for(;*f;f+)if(*f=c)continue;*t = *f;t+;*t = 0;return s;void main()char input1000;char c;printf(请

22、输入一个字符串: );gets(input);printf(请输入一个字符: );scanf(%c,&c);printf(结果: );puts(fun(input,c);3#include long fun(int g)switch(g)case 0: return 0; case 1: case 2: return 1; return (fun(g-1)+fun(g-2);void main() long fib; int n; printf(Input n:);scanf(%d,&n);printf(n=%dn,n); fib=fun(n); printf(fib=%dnn,fib); 4

23、#include #include int fun (int x)if (x 100)printf(data error !n);exit(0); y=fun(x); if (y) printf(%d YESn,x); else printf(%d NO!n,x);5#include #include float fun (float h)long num; h=h+0.005; h=h*100; num=h; h=num; h=h/100; return h;void main()float a; clrscr(); printf(Enter a:);scanf(%f,&a); printf

24、(The original data is:); printf(%f nn,a); printf(The result: %fn,fun(a);6#include #include #define N 81void fun (char *s)int i,length;char tmp;length=strlen(s);if(length=0)return; tmp=s0; for(i=0;ilength-1;i+) si=si+1; slength-1=tmp;void main( ) char aN; clrscr( );printf(Enter a string:); gets(a);pr

25、intf(The original string is: ); puts(a); fun(a); printf(The string after modified: ); puts(a);第8章 编译与预处理一、选择题1234567DBA无答案（5）ADB二、填空题1c2937041000 1059911三、运行结果题1 a=62 a=3a=33 x= 934 a=14,b=15c=05 错误四、编程题1#include#include #define BICIR(a,b,c) sqrt(a+b+c)/2)*(a+b+c)/2-a)*(a+b+c)/2-b)*(a+b+c)/2-c)void

26、main() float a,b,c; scanf(%f%f%f,&a,&b,&c); printf(%f,BICIR(a,b,c);2#include#include #define min(a,b,c) ab?(bc?c:b):(ac?c:a)void main() float a,b,c; scanf(%f%f%f,&a,&b,&c); printf(%f,min(a,b,c);3#include#define sum(n) (1+(n)*(n)/2void main() int n,sum; printf(enter your number:n); scanf(%d,&n); sum=

27、sum(n); printf(the sum is %dn,sum); 第9章 结构体与其他数据类型一、选择题1234567CDDABCC二、填空题1emoclew 213431三、编程题1.#include #include #define N 16typedef structchar num10; int s;STREC;STREC fun(STREC *a,char *b)STREC k; int i,flag=0;for(i=0;iN;i+)if(strcmp(ai.num,b)=0)k=ai;flag=1;if(flag=1)return k;elsestrcpy(k.num,);k

28、.s=-1;return k;void main() STREC sN=GA05,85,GA03,76,GA02,69,GA04,85,GA01,91,GA07,72,GA08,64,GA06,87,GA015,85,GA013,91,GA012,64,GA014,91,GA011,91,GA017,64,GA018,64,GA016,72;STREC h;char m10; int i;FILE *out;printf(The original data:n);for(i=0;iN;i+) if(i)%4=0)printf(n); printf(%s %3d,si.num,si.s);pri

29、ntf(nnEnter the number: );gets(m);h=fun(s,m);printf(The data: );printf(n%s %4dn,h.num,h.s);printf(n);out=fopen(out17.dat,w);h=fun(s,GA013);fprintf(out,%s %4dn,h.num,h.s);fclose(out);2.#include #include #define N 8struct slist double s; struct slist *next;typedef struct slist STREC;double fun(STREC *

30、h)STREC *c;double max;c=h-next;max=c-s; while(c-next!=0)c=c-next;if(maxs) max=c-s; return max;STREC *creat(double *s) STREC *h,*p,*q;int i=0;h=p=(STREC*)malloc(sizeof(STREC);p-s=0;while(is=si;i+;p-next=q;p=q;p-next=0;return h;outlist(STREC *h) STREC *p;p=h-next; printf(head);do printf(-%2.0f,p-s);p=

31、p-next;while(p!=0);printf(nn);void main() double sN=85,76,69,85,91,72,64,87,max; STREC *h; h=creat(s); outlist(h); max=fun(h); printf(max=%6.1fn,max);第10章 文件一、选择题12345678910DBBDACCBCA111213141516ACAAAD二、填空题1.二进制文件、文本文件2.n,n3.1,04. 一个指针，存放输入数据的首地址 从fp所指的文件中，每次读size个字节(一个实数)送入实数组fa中，连续读count次，到buffer中5.”file2.txt”,fclose(fp)三、读程序题1输入文件名，输入字符到输入#结束，把这些字符写入文件，最后写入字符数。2向test文件写入new world，又向test文件覆盖写入hello3”abc.txt”,”r”Break;fclose(fp)