C语言程序设计教程(第二版) 周宇 课后答案

二、 1. I love China! printf("we are students.\n") 2. 6 项目实训题参考答案 1．编写一个C程序，输出以下信息： * * * * * * * * * * * * * * * * * * * * I am a student! * * * * * * * * * * * * * * * * * * * *main() { printf("********************\n") printf(" I am a student!\n ") printf("********************\n")} 2222．．．．已知立方体的长、宽、高分别是10cm、20cm、15cm，编写程序，求立方体体积。 解：main() { int a,b,c,v a=10 b=20 c=15 v=a*b*c printf("v=%d",v)} 本程序运行结果为: v=3000 第第第第2章章章章 编制编制编制编制C程序的基础知识程序的基础知识程序的基础知识程序的基础知识 一 选择题 C B A B A C C 二 *** 作题 2 21. 3，2，-8，23.000000，2.500000，-8.000000 2. ABC DE FGH why is 21+35 equal 52 3. 3 1 4 3 2 3 1 2 4. aa bb cc abc A N项目实训题 1．定义一个符号常量M为5和一个变量n值为2，把它们的乘积输出。 #define M 5 main() { int n,c n=2c=M*nprintf("%d\n",c) } 2．编程求下面算术表达式的值。 （1）x+a%3*(int)(x+y)%2/4，设x=2.5,a=7,y=4.7（2）(float)(a+b)/2+(int)x%(int)y，设a=2,b=3,x=3.5,y=2.5。 （1）main() { int a=7 float x=2.5,y=4.7printf("%f\n",x+a%3*(int)(x+y)%2/4) }（2）main() { int a=2,b=3float x=3.5,y=2.5 printf("%f\n",(float)(a+b)/2+(int)x%(int)y) 第三章第三章第三章第三章顺序结构程序设计顺序结构程序设计顺序结构程序设计顺序结构程序设计一 选择题A C D C C 二 *** 作题 1. x=3,a=2,b=3 2. z=12.700000 3. 1 2 1 a 2 1 2 三三三三．．．．编程题 编程题编程题编程题编程题 1. 某工种按小时计算工资，每月劳动时间（小时）×每小时工资=总工资，总工资中扣除10%公积金，剩余的为应发工资。编写一个程序从键盘输入劳动时间和每小时工资，打印出应发工资。 解： #include <stdio.h>main() { float sj,gz,yfgz printf("time,salary:") scanf("%f,%f",&sj,&gz) yfgz=sj*gz*0.9 printf("total salary:%f\n",yfgz)} 本程序运行结果为: time,salary:4,3<CR> total salary:10.800000 2．编写一个程序求出任意一个输入字符的ASCII码 解： #include <stdio.h>main() { char c printf("Input a string:") scanf("%c",&c) printf("%c ASCII is %d\n",c,c)} 本程序运行结果为:Input a string:a<CR> a ASCII is 97 3、编写一个程序用于水果店售货员算帐：已知苹果每斤2.50元，鸭梨每斤1.80元，香蕉每斤2元，橘子每斤1.6元，要求输入各类水果的重量，打印出应付第四章第四章第四章第四章选择结构程序设计选择结构程序设计选择结构程序设计选择结构程序设计一、略 二、B B A B C B A 三、1. 1 0 2. 2 3 2 2 3. 10 20 0 4. ch>=’A’&&ch<=’Z’||ch>=’a’&&ch<=’z’ ch>=’0’&&ch<=’9’ ch==’ ’ 5. -1 四、上机 *** 作 1. 从键盘输入一个英文字母，如果是大写字母，则将它变为小写字母输出；如果是小写字母，则将其变为大写字母输出。 #include<stdio.h>main() {char chch=getchar()if(ch>='A'&&ch<='Z') ch+=32else if(ch>='a'&&ch<='z') ch-=32putchar(ch)putchar('\n')} 2. 根据输入的x值依据下列表达式，计算y的值。 2x (x>-1) y = 3 (x=-1) 4+x (x<-1) 解： main() { float x,y scanf("%f",&x) if(x>-1)y=2*x else if(x==1) y=3 else y=4+x printf("y=%f",y)} 本程序运行结果为: -2<CR> y=2.000000 3．编写程序，输入一个整数，判断它是奇数还是偶数，若是奇数，输出“Is Odd“若是偶数，输出“Is Even“。 main() { int x scanf("%d",&x) if(x%2==0) printf("Is Even\n") else printf("Is Odd\n") } 4．设计应用程序，求二次方程ax2+bx+c=0的解。 #include<math.h>main() { float a,b,c,disc,x1,x2,p,q scanf("%f,%f,%f",&a,&b,&c) if(fabs(a)<=1e-6) printf(" The equation is not a quadratic\n") else{ disc=b*b-4*a*c if(fabs(disc)<1e-6) printf("x1=x2=%8.4f\n",-b/(2*a)) else if(disc>1e-6) {x1=(-b+sqrt(disc)/(2*a)) x2=(-b-sqrt(disc)/(2*a)) printf("x1=%8.4f,x2=%8.4f\n",x1,x2)} else { p=-b/(2*a) q=sqrt(-disc/(2*a)) printf("%8.4f+%x8.4fi\n",p,q) printf("%8.4f-%8.4fi\n",p,q)} } } 5555．．．．按托运规则，行李不超过50公斤时，运费为0.15元/公斤，如超过50公斤，超过部分的运费为0.22元/公斤，现有行李w公斤，编写一个程序计算运费。 解： #include <stdio.h>main() { float w,f,x printf("weight:") scanf("%f",&w) if(w<=50) x=0.15*w else x=0.15*50+0.22*(w-50) printf("money:%6.2f yuan\n",x)} 本程序运行结果为: weight:20<CR> money:3.00 yuan weight:60<CR> money:9.70 yuan 6. 某商场给与顾客购物的折扣率如下： 购物金额<200元 不打折 500元>购物金额>=200元 9折 1000元>购物金额>=500元 8折 购物金额>=1000元7.5折 输入一个购物金额，输出打折率、购物实际付款金额。 #include<stdio.h>main() { float x,y,realx scanf("%f",&x) if(x<=0) { printf("Error! You input a worry number!\n")y=0} else { if(x<200) y=1.0else if(x<500) y=0.9else if(x<1000) y=0.8else y=0.75} if(y!=0) {realx=x*y printf("y=%f, the realx=%5.2f\n", y,realx)} } 第五章第五章第五章第五章循环结构程序设计循环结构程序设计循环结构程序设计循环结构程序设计一、选择题 C C A A D D第六章第六章第六章第六章 数组数组数组数组 、选择题 D A D A A C C A D 二、程序阅读题 13 13 13 13 13 13第七章第七章第七章第七章函数函数函数函数一、选择题 B D C B B D A A D第第第第8888章章章章指针指针指针指针一、选择题 D A C C(D) D C D 二、填空题 1. m 2. 指针数组名 3. ABCDCD 4.49 5. 25

第一章

1.6

main()

{int a,b,c,max

printf("input three numbers:\n")

scanf("%d,%d,%d",&a,&b,&c)

max=a

if(max<b)max=b

if(max<c)max=c

printf("max=%d",max)

}

第二章

2.3

(1)(10)10=(12)8=(a)16

(2)(32)10=(40)8=(20)16

(3)(75)10=(113)8=(4b)16

(4)(-617)10=(176627)8=(fd97)16

(5)(-111)10=(177621)8=(ff91)16

(6)(2483)10=(4663)8=(963)16

(7)(-28654)10=(110022)8=(9012)16

(8)(21003)10=(51013)8=(520b)16

2.6

aabb(8)cc(8)abc

(7)AN

2.7

main()

{char c1='C',c2='h',c3='i',c4='n',c5='a'

c1+=4, c2+=4, c3+=4, c4+=4, c5+=4

printf("%c%c%c%c%c\n",c1,c2,c3,c4,c5)

}

2.8

main()

{int c1,c2

c1=97c2=98

printf("%c %c",c1,c2)

}

2.9

(1)=2.5

(2)=3.5

2.10

9,11,9,10

2.12

(1)24 (2)10 (3)60 (4)0 (5)0 (6)0

第三章

3.4

main()

{int a,b,c

long int u,n

float x,y,z

char c1,c2

a=3b=4c=5

x=1.2y=2.4z=-3.6

u=51274n=128765

c1='a'c2='b'

printf("\n")

printf("a=%2d b=%2d c=%2d\n",a,b,c)

printf("x=%8.6f,y=%8.6f,z=%9.6f\n",x,y,z)

printf("x+y=%5.2f y+z=%5.2f z+x=%5.2f\n",x+y,y+z,z+x)

printf("u=%6ld n=%9ld\n",u,n)

printf("c1='%c'or %d(ASCII)\n",c1,c1)

printf("c2='%c'or %d(ASCII)\n",c2,c2)

}

3.5

57

5 7

67.856400,-789.123962

67.856400,-789.123962

67.86 -789.12,67.856400,-789.123962,67.856400,-789.123962

6.785640e+001,-7.89e+002

A,65,101,41

1234567,4553207,d687

65535,177777,ffff,-1

COMPUTER, COM

3.6

a=3 b=7/

x=8.5 y=71.82/

c1=A c2=a/

3.7

10 20Aa1.5 -3.75 +1.4,67.8/

(空3)10(空3)20Aa1.5(空1)-3.75(空1)(随意输入一个数），67.8回车

3.8

main()

{float pi,h,r,l,s,sq,sv,sz

pi=3.1415926

printf("input r,h\n")

scanf("%f,%f",&r,&h)

l=2*pi*r

s=r*r*pi

sq=4*pi*r*r

sv=4.0/3.0*pi*r*r*r

sz=pi*r*r*h

printf("l=%6.2f\n",l)

printf("s=%6.2f\n",s)

printf("sq=%6.2f\n",sq)

printf("vq=%6.2f\n",sv)

printf("vz=%6.2f\n",sz)

}

3.9

main()

{float c,f

scanf("%f",&f)

c=(5.0/9.0)*(f-32)

printf("c=%5.2f\n",c)

}

3.10

#include"stdio.h"

main()

{char c1,c2

scanf("%c,%c",&c1,&c2)

putchar(c1)

putchar(c2)

printf("\n")

printf("%c%c\n",c1,c2)

}

第四章

4.3

(1)0 (2)1 (3)1 (4)0 (5)1

4.4

main()

{int a,b,c

scanf("%d,%d,%d",&a,&b,&c)

if(a<b)

if(b<c)

printf("max=%d\n",c)

else

printf("max=%d\n",b)

else if(a<c)

printf("max=%d\n",c)

else

printf("max=%d\n",a)

}

main()

{int a,b,c,temp,max

scanf("%d,%d,%d",&a,&b,&c)

temp=(a>b)?a:b

max=(c>temp)?c:temp

printf("max=%d",max)

}

4.5

main()

{int x,y

scanf("%d",&x)

if(x<1)y=x

else if(x<10)y=2*x-1

else y=3*x-11

printf("y=%d",y)

}

4.6

main()

{int score,temp,logic

char grade

logic=1

while(logic)

{scanf("%d",&score)

if(score>=0&&score<=100)logic=0

}

if(score==100)

temp=9

else

temp=(score-score%10)/10

switch(temp)

{case 9:grade='A'break

case 8:grade='B'break

case 7:grade='C'break

case 6:grade='D'break

case 5:

case 4:

case 3:

case 2:

case 1:

case 0:grade='E'

}

printf"score=%d,grade=%c",score,grade)

}

4.7

main()

{long int num

int indiv,ten,hundred,thousand,ten_thousand,place

scanf("%ld",&num)

if(num>9999) place=5

else if(num>999) place=4

else if(num>99) place=3

else if(num>9) place=2

else place=1

printf("place=%d\n",place)

ten_thousand=num/10000

thousand=(num-ten_thousand*10000)/1000

hundred=(num-ten_thousand*10000-thousand*1000)/100

ten=(num-ten_thousand*10000-thousand*1000-hundred*100)/10

indiv=num-ten_thousand*10000-thousand*1000-hundred*100-ten*10

switch(place)

{case 5:printf("%d,%d,%d,%d,%d\n",ten_thousand,thousand,hundred,ten,indiv)

printf("%d,%d,%d,%d,%d\n",indiv,ten,hundred,thousand,ten_thousand)

break

case 4:printf("%d,%d,%d,%d\n",thousand,hundred,ten,indiv)

printf("%d,%d,%d,%d\n",indiv,ten,hundred,thousand)

break

case 3:printf("%d,%d,%d\n",hundred,ten,indiv)

printf("%d,%d,%d\n",indiv,ten,hundred)

break

case 2:printf("%d,%d\n",ten,indiv)

printf("%d,%d\n",indiv,ten)

break

case 1:printf("%d\n",indiv)

printf("%d\n",indiv)

}

}

4.8

main()

{long i

float bonus,bon1,bon2,bon4,bon6,bon10

bon1=100000*0.1

bon2=bon1+100000*0.075

bon4=bon2+200000*0.05

bon6=bon4+200000*0.03

bon10=bon6+400000*0.015

scanf("%ld",&i)

if(i<=1e5)bonus=i*0.1

else if(i<=2e5)bonus=bon1+(i-100000)*0.075

else if(i<=4e5)bonus=bon2+(i-200000)*0.05

else if(i<=6e5)bonus=bon4+(i-400000)*0.03

else if(i<=1e6)bonus=bon6+(i-600000)*0.015

else bonus=bon10+(i-1000000)*0.01

printf("bonus=%10.2f",bonus)

}

main()

{long i

float bonus,bon1,bon2,bon4,bon6,bon10

int branch

bon1=100000*0.1

bon2=bon1+100000*0.075

bon4=bon2+200000*0.05

bon6=bon4+200000*0.03

bon10=bon6+400000*0.015

scanf("%ld",&i)

branch=i/100000

if(branch>10)branch=10

switch(branch)

{case 0:bonus=i*0.1break

case 1:bonus=bon1+(i-100000)*0.075break

case 2:

case 3:bonus=bon2+(i-200000)*0.05break

case 4:

case 5:bonus=bon4+(i-400000)*0.03break

case 6:

case 7

case 8:

case 9:bonus=bon6+(i-600000)*0.015break

case 10:bonus=bon10+(i-1000000)*0.01

}

printf("bonus=%10.2f",bonus)

}

4.9

main()

{int t,a,b,c,d

scanf("%d,%d,%d,%d",&a,&b,&c,&d)

if(a>b){t=aa=bb=t}

if(a>c){t=aa=cc=t}

if(a>d){t=aa=dd=t}

if(b>c){t=bb=cc=t}

if(b>d){t=bb=dd=t}

if(c>d){t=cc=dd=t}

printf("%d %d %d %d\n",a,b,c,d)

}

4.10

main()

{int h=10

float x,y,x0=2,y0=2,d1,d2,d3,d4

scanf("%f,%f",&x,&y)

d1=(x-x0)*(x-x0)+(y-y0)*(y-y0)

d2=(x-x0)*(x-x0)+(y+y0)*(y+y0)

d3=(x+x0)*(x+x0)+(y-y0)*(y-y0)

d4=(x+x0)*(x+x0)+(y+y0)*(y+y0)

if(d1>1&&d2>1&&d3>1&&d4>1)h=0

printf("h=%d",h)

}

第五章 循环控制

5.1

main()

{int a,b,num1,num2,temp

scanf("%d,%d",&num1,&num2)

if(num1<num2){temp=num1num1=num2num2=temp}

a=num1b=num2

while(b!=0)

{temp=a%b

a=b

b=temp}

printf("%d\n",a)

printf("%d\n",num1*num2/a)

}

5.2

#include"stdio.h"

main()

{char c

int letters=0,space=0,digit=0,other=0

while((c=getchar())!='\n')

{if(c>='a'&&c<='z'||c>='A'&&c<='Z') letters++

else if(c==' ')space++

else if(c>='0'&&c<='9')digit++

else other++

}

printf("letters=%d\nspace=%d\ndigit=%d\nother=%d\n",letters,space,digit,other)

}

5.3

main()

{int a,n,count=1,sn=0,tn=0

scanf("%d,%d",&a,&n)

while(count<=n)

{tn+=a

sn+=tn

a*=10

++count

}

printf("a+aa+aaa+...=%d\n",sn)

}

5.4

main()

{float n,s=0,t=1

for(n=1n<=20n++)

{t*=n

s+=t

}

printf("s=%e\n",s)

}

5.5

main()

{int N1=100,N2=50,N3=10

float k

float s1=0,s2=0,s3=0

for(k=1k<=N1k++)s1+=k

for(k=1k<=N2k++)s2+=k*k

for(k=1k<=N3k++)s3+=1/k

printf("s=%8.2f\n",s1+s2+s3)

}

5.6

main()

{int i,j,k,n

for(n=100n<1000n++)

{i=n/100

j=n/10-i*10

k=n%10

if(i*100+j*10+k==i*i*i+j*j*j+k*k*k)

printf("n=%d\n",n)

}

}

5.7

#define M 1000

main()

{int k0,k1,k2,k3,k4,k5,k6,k7,k8,k9

int i,j,n,s

for(j=2j<=Mj++)

{n=0

s=j

for(i=1i<ji++)

{if((j%i)==0)

{n++

s=s-i

switch(n)

{case 1:k0=ibreak

case 2:k1=ibreak

case 3:k2=ibreak

case 4:k3=ibreak

case 5:k4=ibreak

case 6:k5=ibreak

case 7:k6=ibreak

case 8:k7=ibreak

case 9:k8=ibreak

case 10:k9=ibreak

}

}

}

if(s==0)

{printf("j=%d\n",j)

if(n>1)printf("%d,%d",k0,k1)

if(n>2)printf(",%d",k2)

if(n>3)printf(",%d",k3)

if(n>4)printf(",%d",k4)

if(n>5)printf(",%d",k5)

if(n>6)printf(",%d",k6)

if(n>7)printf(",%d",k7)

if(n>8)printf(",%d",k8)

if(n>9)printf(",%d\n",k9)

}

}

}

main()

{static int k[10]

int i,j,n,s

for(j=2j<=1000j++)

{n=-1

s=j

for(i=1i<ji++)

{if((j%i)==0)

{n++

s=s-i

k[n]=i

}

}

if(s==0)

{printf("j=%d\n",j)

for(i=0i<ni++)

printf("%d,",k[i])

printf("%d\n",k[n])

}

}

}

5.8

main()

{int n,t,number=20

float a=2b=1s=0

for(n=1n<=numbern++)

{s=s+a/b

t=a,a=a+b,b=t

}

printf("s=%9.6f\n",s)

}

5.9

main()

{float sn=100.0,hn=sn/2

int n

for(n=2n<=10n++)

{sn=sn+2*hn

hn=hn/2

}

printf("sn=%f\n",sn)

printf("hn=%f\n",hn)

}

5.10

main()

{int day,x1,x2

day=9

x2=1

while(day>0)

{x1=(x2+1)*2

x2=x1

day--

}

printf("x1=%d\n",x1)

}

5.11

#include"math.h"

main()

{float a,xn0,xn1

scanf("%f",&a)

xn0=a/2

xn1=(xn0+a/xn0)/2

do

{xn0=xn1

xn1=(xn0+a/xn0)/2

}

while(fabs(xn0-xn1)>=1e-5)

printf("a=%5.2f\n,xn1=%8.2f\n",a,xn1)

}

5.12

#include"math.h"

main()

{float x,x0,f,f1

x=1.5

do

{x0=x

f=((2*x0-4)*x0+3)*x0-6

f1=(6*x0-8)*x0+3

x=x0-f/f1

}

while(fabs(x-x0)>=1e-5)

printf("x=%6.2f\n",x)

}

5.13

#include"math.h"

main()

{float x0,x1,x2,fx0,fx1,fx2

do

{scanf("%f,%f",&x1,&x2)

fx1=x1*((2*x1-4)*x1+3)-6

fx2=x2*((2*x2-4)*x2+3)-6

}

while(fx1*fx2>0)

do

{x0=(x1+x2)/2

fx0=x0*((2*x0-4)*x0+3)-6

if((fx0*fx1)<0)

{x2=x0

fx2=fx0

}

else

{x1=x0

fx1=fx0

}

}

while(fabs(fx0)>=1e-5)

printf("x0=%6.2f\n",x0)

}

5.14

main()

{int i,j,k

for(i=0i<=3i++)

{for(j=0j<=2-ij++)

printf(" ")

for(k=0k<=2*ik++)

printf("*")

printf("\n")

}

for(i=0i<=2i++)

{for(j=0j<=ij++)

printf(" ")

for(k=0k<=4-2*ik++)

printf("*")

printf("\n")

}

}

5.15

main()

{char i,j,k

for(i='x'i<='z'i++)

for(j='x'j<='z'j++)

{if(i!=j)

for(k='x'k<='z'k++)

{if(i!=k&&j!=k)

{if(i!='x'&&k!='x'&&k!='z')

printf("\na--%c\tb--%c\tc--%c\n",i,j,k)

}

}

}

}

第六章 数组

6.1

#include <math.h>

#define N 101

main()

{ int i,j,line,a[N]

for (i=2i<Ni++) a[i]=i

for (i=2i<sqrt(N)i++)

for (j=i+1j<Nj++)

{if(a[i]!=0 &&a[j]!=0)

if (a[j]%a[i]==0)

a[j]=0 }

printf("\n")

for (i=2,line=0i<Ni++)

{ if(a[i]!=0)

{ printf("%5d",a[i])

line++ }

if(line==10)

{ printf("\n")

line=0 }

}

}

6.2

#define N 10

main()

{int i,j,min,temp,a[N]

for(i=0i<Ni++)

scanf("%d",&a[i])

for(i=0i<N-1i++)

{min=i

for(j=i+1j<Nj++)

if(a[min]>a[j])min=j

temp=a[i]

a[i]=a[min]

a[min]=temp

}

for(i=0i<Ni++)

printf("%5d",a[i])

}

6.3

main()

{float a[3][3],sum

int i,j

for(i=0i<3i++)

for(j=0j<3j++)

{scanf("%f",&sum)

a[i][j]=sum

}

for(i=0i<3i++)

sum=sum+a[i][i]

printf("sum=%f",sum)

}

6.4

main()

{int a[11]={1,4,6,9,13,16,19,28,40,100}

int temp1,temp2,number, end,i,j

scanf("%d",&number)

end=a[9]

if(number>end) a[10]=number

else

{for(i=0i<10i++)

{if(a[i]>number)

{temp1=a[i]

a[i]=number

for(j=i+1j<11j++)

{temp2=a[j]

a[j]=temp1

temp1=temp2

}

break

}

}

}

for(i=0i<11i++)

printf("%6d",a[i])

}

6.5

#define N 5

main()

{int a[N]={8,6,5,4,1},i,temp

for(i=0i<N/2i++)

{temp=a[i]

a[i]=a[N-i-1]

a[N-i-1]=temp

}

for(i=0i<Ni++)

printf("%4d",a[i])

}

6.6

#define N 11

main()

{int i,j,a[N][N]

for(i=1i<Ni++)

{a[i][i]=1

a[i][1]=1

}

for(i=3i<Ni++)

for(j=2j<ij++)

a[i][j]=a[i-1][j-1]+a[i-1][j]

for(i=1i<Ni++)

{for(j=1j<=ij++)

printf("%6d",a[i][j])

printf("\n")

}

}

6.7

main()

{int a[16][16],i,j,k,p,m,n

p=1

while(p==1)

{scanf("%d",&n)

if((n!=0)&&(n<=15)&&(n%2!=0))p=0

}

for(i=1i<=ni++)

for(j=1j<=nj++)

a[i][j]=0

j=n/2+1

a[1][j]=1

for(k=2k<=n*nk++)

{i=i-1

j=j+1

if((i<1)&&(j>n))

{i=i+2

j=j-1

}

else

{if(i<1)i=n

if(j>n)j=1

}

if(a[i][j]==0)a[i][j]=k

else

{i=i+2

j=j-1

a[i][j]=k

}

}

for(i=1i<=ni++)

{for(j=1j<=nj++)

printf("%3d",a[i][j])

printf("\n")

}

}

6.8

#define N 10

#define M 10

main()

{int i,j,k,m,n,flag1,flag2,a[N][M],max,maxi,maxj

scanf("%d,%d",&n,&m)

for(i=0i<ni++)

for(j=0j<mj++)

scanf("%d",&a[i][j])

flag2=0

for(i=0i<ni++)

{max=a[i][0]

for(j=0j<mj++)

if(max<a[i][j])

{max=a[i][j]

maxj=j

}

for(k=0,flag1=1k<n&&flag1k++)

if(max>a[k][maxj])flag1=0

if(flag1)

{ printf("\na[%d][%d]=%d\n",i,maxj,max)

flag2=1

}

}

if(!flag2) printf("NOT")

}

6.9

#include<stdio.h>

#define N 15

main()

{int i,j,number,top,bott,min,loca,a[N],flag

char c

for(i=0i<=Ni++)

scanf("%d",&a[i])

flag=1

while(flag)

{scanf("%d",&number)

loca=0

top=0

bott=N-1

if((number<a[0])||(number>a[N-1]))

loca=-1

while((loca==0)&&(top<=bott))

{min=(bott+top)/2

if(number==a[min])

{loca=min

printf("number=%d,loca=%d\n",number,loca+1)

}

else if(number<a[min])

bott=min-1

else

top=min+1

}

if(loca==0||loca==-1)

printf("%d not in table\n",number)

printf("continue Y/N or y/n\n")

c=getchar()

if(c=='N'||c=='n')flag=0

}

}

6.10

main()

{int i,j,uppn,lown,dign,span,othn

char text[3][80]

uppn=lown=dign=span=othn=0

for(i=0i<3i++)

{gets(text[i])

for(j=0j<80&&text[i][j]!='\0'j++)

{if(text[i][j]>='A'&&text[i][j]<='Z')

uppn++

else if(text[i][j]>='a'&&text[i][j]<='z')

lown++

else if(text[i][j]>='0'&&text[i][j]<='9')

dign++

else if(text[i][j]==' ')

span++

else

othn++

}

}

for(i=0i<3i++)

printf("%s\n",text[i])

printf("uppn=%d\n",uppn)

printf("lown=%d\n",lown)

printf("dign=%d\n",dign)

printf("span=%d\n",span)

printf("othn=%d\n",othn)

}

6.11

main()

{static char a[5]={'*','*','*','*','*'}

int i,j,k

char space=' '

for(i=0i<=5i++)

{printf("\n")

for(j=1j<=3*ij++)

printf("%1c",space)

for(k=0k<=5k++)

printf("%3c",a[k])

}

}

6.12

#include<stdio.h>

main()

{int i,n

char ch[80],tran[80]

gets(ch)

i=0

while(ch[i]!='\0')

{if((ch[i]>='A')&&(ch[i]<='Z'))

tran[i]=26+64-ch[i]+1+64

else if((ch[i]>='a')&&(ch[i]<='z'))

tran[i]=26+96-ch[i]+1+96

else

tran[i]=ch[i]

i++

}

n=i

for(i=0i<ni++)

putchar(tran[i])

}

6.13

main()

{char s1[80],s2[40]

int i=0,j=0

scanf("%s",s1)

scanf("%s",s2)

while(s1[i]!='\0')i++

while(s2[j]!='\0')s1[i++]=s2[j++]

s1[i]='\0'

printf("s=%s\n",s1)

}

6.14

#include<stdio.h>

main()

{int i,resu

char s1[100],s2[100]

gets(s1)

gets(s2)

i=0

while((s1[i]==s2[i])&&(s1[i]!='\0'))i++

if(s1[i]=='\0'&&s2[i]=='\0')resu=0

else

resu=s1[i]-s2[i]

printf("s1=%s,s2=%s,resu=%d\n",s1,s2,resu)

}

6.15

#include"stdio.h"

main()

{char from[80],to[80]

int i

scanf("%s",from)

for(i=0i<=strlen(from)i++)

to[i]=from[i]

printf("%s\n",to)

}

第七章

7.1

hcf(u,v)

int u,v

{int a,b,t,r

if(u>v){t=uu=vv=t}

a=ub=v

while((r=b%a)!=0)

{b=aa=r}

return(a)

}

lcd(u,v,h)

int u,v,h

{return(u*v/h)}

main()

{int u,v,h,l

scanf("%d,%d",&u,&v)

h=hcf(u,v)

printf("H.C.F=%d\n",h)

l=lcd(u,v,h)

printf("L.C.D=%d\n",l)

}

7.2

#include"math.h"

float x1,x2,disc,p,q

greater_than_zero(a,b)

float a,b

{x1=(-b+sqrt(disc))/(2*a)

x2=(-b-sqrt(disc))/(2*a)

}

equal_to_zero(a,b)

flaot a,b

{x1=x2=-b/(2*a)}

smaller_than_zero(a,b)

float a,b

{p=-b/(2*a)

q=sqrt(-disc)/(2*a)

}

main()

{float a,b,c

scanf("%f,%f,%f",&a,&b,&c)

disc=b*b-4*a*c

if(fabs(disc)<=1e-5)

{equal_to_zero(a,b)

printf("x1=%5.2f\tx2=%5.2f\n",x1,x2)

}

else if(disc>0)

{greater_than_zero(a,b)

printf("x1=%5.2f\tx2=%5.2f\n",x1,x2)

}

else

{smaller_than_zero(a,b)

printf("x1=%5.2f+%5.2fi\tx2=%5.2f-%5.2fi\n",p,q,p,q)

}

}

7.3

main()

{int number

scanf("%d",&number)

if(prime(number))

printf("yes")

else

printf("no")

}

int prime(number)

int number

{int flag=1,n

for(n=2n<number/2&&flag==1n++)

if(number%n==0)

flag=0

return(flag)

}

7.4

#define N 3

int array[N][N]

convert(array)

int array[3][3]

{int i,j,t

for(i=0i<Ni++)

for(j=i+1j<Nj++)

{t=array[i][j]

array[i][j]=array[j][i]

array[j][i]=t

}

}

main()

{int i,j

for(i=0i<Ni++)

for(j=0j<Nj++)

scanf("%d",&array[i][j])

convert(array)

for(i=0i<Ni++)

{printf("\n")

for(j=0j<Nj++)

printf("%5d",array[i][j])

}

}

7.5

main()

{char str[100]

scanf("%s",str)

inverse(str)

printf("%s\n",str)

}

inverse(str)

char str[]

{char t

int i,j

for(i=0,j=strlen(str)i<strlen(str)/2i++,j--)

{t=str[i]

str[i]=str[j-1]

str[j-1]=t

}

}

7.6

char concate(str1,str2,str)

char str1[],str2[],str[]

{int i,j

for(i=0str1[i]!='\0'i++)

str[i]=str1[i]

for(j=0str2[j]!='\0'j++)

str[i+j]=str2[j]

str[i+j]='\0'

}

main()

{char s1[100],s2[100],s[100]

scanf("%s",s1)

scanf("%s",s2)

concate(s1,s2,s)

printf("\ns=%s",s)

}

7.7

main()

{char str[80],c[80]

void cpy()

gets(str)

cpy(str,c)

printf("\n%s\n",c)

}

void cpy(s,c)

char s[],c[]

{int i,j

for(i=0,j=0s[i]!='\0'i++)

if(s[i]=='a'||s[i]=='A'||s[i]=='e'||s[i]=='E'||s[i]=='i'||

s[i]=='I'||s[i]=='o'||s[i]=='O'||s[i]=='u'||s[i]=='U')

{c[j]=s[i]j++}

c[j]='\0'

}

7.8

main()

{char str[80]

scanf("%s",str)

insert(str)

}

insert(str)

char str[]

{int i

for(i=strlen(str)i>0i--)

{str[i*2]=str[i]

str[i*2-1]=' '

}

printf("%s\n",str)

}

7.9

int alph,digit,space,others

main()

{char text[80]

gets(text)

alph=0,digit=0,space=0,others=0

count(text)

printf("\nalph=%d,digit=%d,space=%d,others=%d\n",alph,digit,space,others)

}

count(str)

char str[]

{int i

for(i=0str[i]!='\0'i++)

if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z'))

alph++

else if(str[i]>='0'&&str[i]<='9')

digit++

else if(strcmp(str[i],' ')==0)

space++

else

others++

}

7.10

int alph(c)

char c

{if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))

return(1)

else

return(0)

}

int longest(string)

char string[]

{int len=0,i,length=0,flag=1,place,point

for(i=0i<=strlen(string)i++)

if(alph(string[i]))

if(flag)

{point=i

flag=0

}

else

len++

else

{flag=1

if(len>length)

{length=len

place=point

len=0

}

}

return(place)

}

main()

{int i

char line[100]

gets(line)

for(i=longest(line)alph(line[i])i++)

printf("%c",line[i])

printf("\n")

}

7.11

#define N 10

char str[N]

main()

{int i,flag

for(flag=1flag==1)

{scanf("%

---