二级C语言程序设计教程课后习题答案高教版.docx

1、二级C语言程序设计教程课后习题答案高教版二级C语言程序设计教程课后习题答案(高教版) - 发表日期：2006年3月3日 已经有4039位读者读过此文 第一章【1-1】.exe【1-2】.c .obj .exe 【1-3】顺序，分枝（选择），循环第二章【2-1】B 【2-2】D【2-3】B【2-4】A【2-5】C【2-6】A【2-7】B【2-8】B【2-9】A【2-10】C【2-11】B【2-12】B【2-13】A【2-14】11，12【2-15】4.2，4.2【2-16】,定义说明,执行语句【2-17】关键字,用户标识符【2-18】int,float,double【2-19】float a=b

2、=1; 【2-20】存贮单元【2-21】3.5【2-22】a*b/c,a/c*b,b/c*a【2-23】把10赋予变量s【2-24】bit,0/1【2-25】8,127,01111111,-128,10000000(补码) 【2-26】32767,-32768,111111*1,1000000000000000【2-27】8,10,16【2-28-1】(错误)#include stdio.h;main() / * main function * / float r,s; /*/*r is radius*/,/* s is area of circular */*/ r=5.0; s=3.141

3、59*r*r; printf(%fn,s)【2-28-2】(正确)#include stdio.h;main() /* main function */ float r,s; /* r is radius, s is area of circular */ r=5.0; s=3.14159*r*r; printf(%fn,s); 【2-29-1】(错误)#include stdio.hmain /* main function */ float a,b,c,v; /* a,b,c are sides, v is volume of cube */ a=2.0; b=3.0; c=4.0 v=a

4、*b*c; printf(%fn,v)【2-29-2】(正确)#include main() /* main function */ float a,b,c,v; /* a,b,c are sides, v is volume of cube */ a=2.0; b=3.0; c=4.0; v=a*b*c; printf(%fn,v);第三章【3-1】C 【3-2】C 【3-3】D 【3-4】C 【3-5】D 【3-6】B 【3-7】C 【3-8】D 【3-9】A 【3-10】B 【3-11】C 【3-12】D 【3-13】D【3-14】C 【3-15】C 【3-16】C 【3-17】C 【3

5、-18】A 【3-19】C【3-20】B 【3-21】(1)-200 2500(2)i=-200, j=2500(3)i=-200/(换行)j=2500【3-22】12,0,0【3-23】一条语句,;【3-24】; 【3-25】100 25.81 1.89234,100/25.81/1.89234,100/25.81 1.89234【3-26】x=127,x= 127,x= 177,x= 7f,x= 127【3-27】x=127,x=127 ,x=$127 ,x=$000127,x=%06d【3-28】a=513.789215,a= 513.79,a= 513.78921500,a= 513.

6、78921500【3-29-1】(错误)main double a,b,c,s,v; printf(input a,b,c:n); scanf(%d %d %d,a,b,c); s=a*b; v=a*b*c; printf(%d %d %d,a,b,c); printf(s=%fn,s,v=%dn,v);【3-29-2】(正确)main() float a,b,c,s,v; printf(input a,b,c:); scanf(%f %f %f:,&a,&b,&c); s=a*b; v=a*b*c; printf(a=%f,b=%f,c=%fn,a,b,c); printf(s=%f,v=%

7、fn,s,v);【3-30】main() int h,m; h=560/60; m=560%60; printf(%dh:%dm,h,m); getch();【3-31】main() int m,n; printf(input m & n:); scanf(%d%d,&m,&n); printf(n%d,%dn,m/n,m%n); getch(); 【3-32】main() double x,y,z,s; printf(input x,y,z: ); scanf(%lf%lf%lf,&x,&y,&z); s=(x+y+z)/3.0; printf(nAverage=%6.1lfn,s); ge

8、tch();【3-33】main() int a,b,c,t; printf(Input a,b,c: ); scanf(%d%d%d,&a,&b,&c); t=c; c=b; b=a; a=t; printf(na,b,c=%d,%d,%dn,a,b,c); getch(); 第四章【4-1】A【4-2】A【4-3】A【4-4】D【4-5】C【4-6】A【4-7】B【4-8】A【4-9】D【4-10】A【4-11】非零,零【4-12】,= =,!=【4-13】!,&,| 【4-14】!,关系运算符,&,| 【4-15】! 【4-16】(A)a=b|a4【4-17】1【4-18】xm0)|(m

9、1=m0)&(d1=d0) age=y1-y0; else age=y1-y0-1; printf(nThe student age is %d,age); getch();【4-23】main() int m; printf(ninput a integer: ); scanf(%d,&m); if (m%2=0) printf(n%d is event.,m); else printf(n%d is ord.,m); getch();【4-24】main() int a,b,c,max; printf(ninput a,b,c: ); scanf(%d%d%d,&a,&b,&c); max

10、=a; if (bmax) max=b; if (cmax) max=c; printf(max is %d,max); getch();【4-25-1】main() int x,y; printf(ninput x: ); scanf(%d,&x); if(x-5)&(x0)&(x-5)&(x10) if (x0) y=x+1; printf(nx is %d , y is %d,x,y); else printf(input x is error ! %c,007); getch();【4-25-3】main() int x,y; printf(ninput x: ); scanf(%d,

11、&x); if (x-5)&(x0)&(x10) y=x+1; printf(nx is %d , y is %d,x,y); getch();【4-25-4】main() int x,y; printf(ninput x: ); scanf(%d,&x); switch(x) case -4: case -3: case -2: case -1: y=x;break; case 0 : y=x-1;break; case 1 : case 2 : case 3 : case 4 : case 5 : case 6 : case 7 : case 8 : case 9 : y=x+1;brea

12、k; default : printf(Input x error ! %c,7); printf(nx is %d , y is %d,x,y); getch(); 第五章【5-1】D【5-2】C【5-3】B【5-4】C【5-5】C【5-6】B【5-7】D【5-8】A【5-9】D【5-10】D【5-11】5,4,6【5-12】死循环【5-13】-1【5-14】11【5-15】d=1,k+,k=0,xamin【5-17】main() int i,s=1,k=-1; for (i=1;i=50;i+) s=s+k*(2*i+1); k=-k; printf(s=%d,s); getch();【5

13、-18-1】main() int i=1; double e=1.0,s=1.0; for(i=1;i=1e-04) /* 8 times */ s=s*i; i+; e=e+1/s; printf(e=%10.6f,e); getch();【5-19】main() int y,k=0; for(y=1000;y=2000;y+) if (y%4=0&y%100!=0|y%400=0) printf(%10d,y);k+; if (k%3=0) printf(n); getch();【5-20】#include main()int i,j,n; printf(Input n (1-10):);

14、 do scanf(%d,&n); while (n10);for (i=1;i=n;i+) for (j=1;j=40-i;j+) printf( ); for (j=1;j=2*i-1;j+) printf(*); printf(n); for (i=n+1;i=2*n-1;i+) for (j=1;j=40-2*n+i;j+) printf( ); for (j=1;j=4*n-1-2*i;j+) printf(*); printf(n); getch(); 第六章【6-1】B【6-2】D【6-3】A【6-4】A【6-5】B【6-6】D【6-7】D【6-8】B【6-9】A【6-10】A【

15、6-11】C【6-12】26【6-13】1【6-14】ctype.h【6-15】1 【6-16】10A20B30C40D【6-17】7.29 101.298AB【6-18】A7.29B101.298【6-19】A B C 【6-20】#include main() int k=0; char ch; while(ch=getchar()!=10) k+; printf(%4c%4d,ch,ch); if(k%3=0) printf(n); getch();【6-21】#include main() long k=0; char ch; while(ch=getchar()!=EOF) if (

16、ch=0&ch=9) ch=ch-0; k=k*10+ch; printf(%ld,k);getch();【6-22】#include main() int flag,k=0; char ch; while(ch=getchar()!=EOF) if (ch=10) k+; flag=0; else flag=1; if (flag=1) k+; printf(n The line number is %dn,k);getch();【6-23】#include main() int k=0; char ch; while(ch=getchar()!=10) if (ch=a&ch=z) k+;

17、 printf(n The lower letter number is %dn,k);getch();【6-24】#include main() int i,j,n; printf(Input line number : ); scanf(%d,&n); for(i=1;i=n;i+) for (j=1;j=40-i;j+) printf( ); for(j=1;j=2*i-1;j+) printf(%c,64+i); printf(n); getch(); 第七章【7-1】C【7-2】C【7-3】B【7-4】C【7-5】A【7-6】D【7-7】A【7-8】12【7-9】9.000000【7

18、-10】4【7-11】n=1,s【7-12】=y,z*x【7-13】1,s*i,0,f(k)【7-14-1】(错误)main()int m; printf(Input a number: ); scanf(%d,&m); m=fun(m); if (m=1) printf(nThis number is a primer !n); else printf(nThis number is not a primer !n);getch(); fun(int n) int k,yes; for (k=2;k=n/2;k+) if (n%k=0) yes=0; else yes=1; return y

19、es;【7-14-2】(正确)main()int m; printf(Input a number: ); scanf(%d,&m); m=fun(m); if (m=1) printf(nThis number is a primer !n); else printf(nThis number is not a primer !n);getch(); fun(int n) int k,yes=1; for (k=2;k=n/2;k+) if (n%k=0) yes=0; return yes;【7-15】main()int a,b; printf(Input a & b:); scanf(%

20、d%d,&a,&b); printf(n%d%d=%d,a,b,mymod(a,b); getch();mymod(int a, int b)int z; z=a%b; return z; 【7-16】float fun(int n)return (1.0/n); main()int i,n,k=1; float s=0.0; printf(Input n:); scanf(%d,&n); for(i=1;i=n;i+) s+=k*fun(i); k=-k; printf(ns=%8.6f,s); getch();【7-17】float f(int m) float t=1.0; int i;

21、 for (i=2;i=m;i+) t-=1.0/(i*i); return t;main()int n; printf(Input n:); scanf(%d,&n); printf(nt=%8.6f,f(n); getch();【7-18】#include float f(float x) float z; z=x*x-5*x+4; return z;main()float x,y1,y2,y3; printf(Input x: ); scanf(%f,&x); y1=f(2); y2=f(x+15); y3=f(sin(x); printf(y1=%10.4fn,y1); printf(

22、y2=%10.4fn,y2); printf(y3=%10.4fn,y3); printf(n* END *); getch();第八章【8-1】A【8-2】B【8-3】B【8-4】C【8-5】B【8-6】B【8-7】C【8-8】D【8-9】B【8-10】C【8-11】C【8-12】C【8-13】110【8-14】7 1【8-15】char *p=ch;,p=&ch;,scanf(“%c”,p);,p=a;,printf(“%c”,p);【8-16】s=p+3;,s-=2,50,*(s+1),2,10 20 30 40 50【8-17-1】fun(x,y)int *x,*y;int z1,z2

23、; z1=*x+*y; z2=*x-*y; *x=z1; *y=z2;main()int *a,*b,A,B; a=&A,b=&B; printf(input two numbers: ); scanf(%d%d,a,b); printf(a,b=%d,%dn,*a,*b); printf(before call function:n); printf(a=%d b=%dn,*a,*b); fun(a,b); printf(after call function:n); printf(a=%d b=%dn,*a,*b); getch();【8-17-2】fun(x,y)float *x,*y;

24、float z1,z2; z1=*x+*y; z2=*x-*y; *x=z1; *y=z2;main()float *a,*b,A,B; a=&A;b=&B; printf(input two real numbers: ); scanf(%f%f,a,b); printf(a,b=%f, %fn,*a,*b); printf(before call function:n); printf(a=%f b=%fn,*a,*b); fun(a,b); printf(after call function:n); printf(a=%f b=%fn,*a,*b); getch();【8-18】fun(int *a,int *b,int *c) int max,min; max=*a;min=*a; if (*b*a) max=*b; if (*bmax) max=*c; if (*cmin) min=*c; *a=max;*c=min;main()int a,b,c; printf(Input a,b,c: ); scanf(%d%d%d