c語言課后習題答案

習題答案

第一章

1.5

#include<stdio.h>

voidmain()

(

printf(**********\noood'\n********

1.6

(法一)

#include<stdio.h>

main()

(

inta,b,c,max;

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

max=(a>b)?a:b;

max=(max>c)?max:c;

printf("max=%d\nH,max);

)

(法二)

main()

(

inta,b,c,max;

scanf(n%d,%d,%du,&a,&b,&c);

if(a>b&&a>c)

max=a;

elseif(b>c)

max=b;

else

max=c;

printf(nmax=%d\n'\max);

)

(法三)

#include<stdio.h>

voidmain()

(

intmax(intx,inty,intz);

inta,b,c,d;

scanf(M%d,%d,%dn,&a,&b,&c);

d=max(a,b,c);

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

)

intmax(intx,inty,intz)

(

intA,B；

if(x>y)A=x;

elseA=y;

if(z>A)B=z;

elseB=A;

retum(B);

)

第三章

3.3

(l)(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)l6

(5)(-1ll)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)l6

3.6

aabb(8)cc(8)abc

(7)AN

3.7

main()

{charc]=,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\nM,cI,c2,c3,c4,c5);

)

3.8

main()

{intcl,c2;

cl=97;c2=98;

printf(u%c%c'\cl,c2);

)

3.9

⑴=2.5

(2)=3.5

3.10

9,11,9,10

3.12

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

笫四章

4.4

main()

{inta,b,c;

longintu,n;

floatx,y,z;

charcl,c2;

a=3;b=4;c=5;

x=1.2;y=2.4;z=-3,6;

u=51274;n=128765;

cl='a';c2士b';

printf(n\nn);

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

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

printf(nx+y=%5.2fy+z=%5.2fz+x=%5.2f\n”,x+y,y+z,z+x);

printf("u=%61dn=%91d\nH,u,n);

printf(Hc1='%c*or%d(ASCII)\nH,cl,cl);

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

)

4.5

57

57

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,

COMPUTER,COM

4.6

a=3b=7/

x=8.5y=7L82/

cl=Ac2=a/

4.7

1020Aal.5-3.75+1.4,67.8/

(空3)10(空3)20Aal.5(空l)-3.75(空1)(隨意輸入一個數(shù))，67.8回車

4.8

main()

{floatpi,h,i;l,s,sq,sv,sz;

pi=3.1415926;

printf("inputr,h\nH);

scanf(n%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\nH,s);

printf(nsq=%6.2f\nn,sq);

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

printf(',vz=%6.2An',,sz);

)

4.9

main()

{floatc,f;

scanf(n%fn,&f)；

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

printf(',c=%5.2f\n,,,c);

)

4.10

#include"stdio.hn

main()

{charcl,c2;

scanf("％c,%c”,&cl,&c2);

putchar(cl);

putchar(c2);

printf(M\n");

printf("％c%c\n”,cl,c2);

第五章

5.3

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

5.4

main()

{inta,b,c;

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

if(a<b)

if(b<c)

printf(nmax=%d\nM,c);

else

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

elseif(a<c)

printf("max=%d\nM,c);

else

printf("max=%d\nn,a);

)

main()

{inta,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);

)

5.5

main()

{intx,y;

scanf(n%d'\&x);

if(x<l)y=x;

elseif(x<10)y=2*x-l;

elsey=3*x-l1;

printf("y=%d',,y);

)

5.6

main()

{intscore,temp,logic;

chargrade;

logic=l;

while(logic)

{scanf(u%dn,&score);

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

)

if(score==100)

temp=9;

else

temp=(score-score%10)/10;

switch(temp)

{case9:grade=,A,;break;

case8:grade=,B,;break;

case7:grade=,C';break;

case6:grade=,D,;break;

case5:

case4:

case3:

case2:

case1:

case0:grade=,E,;

)

printf'score=%d,grade=%c^^,score,grade);

)

5.7

main()

{longintnum;

intindiv,ten,hundred,thousand,ten_thousand,place;

scanf("%ld",&num);

if(num>9999)place=5;

elseif(num>999)place=4;

elseif(num>99)place=3;

elseif(num>9)place=2;

elseplace=l;

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)

{case5:printf("％d,%d,%d,%d,%d\n”,ten_thousand,thousand,hundred,ten,indiv);

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

break;

case4:printf("%d,%d,%d,%d\n'\thousand,hundred,ten,indiv);

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

break;

case3:printf("%d,%d,%d\n",hundred,ten,indiv);

printf(n%d,%d,%d\nn,indiv,ten,hundred);

break;

case2:printf("%d,%d\nH,ten,indiv);

prinlf(”％d,%d\n”,indiv,ten);

break;

case1:printf(n%d\n",indiv);

printf(,'%d\n,',indiv);

5.8

main()

{longi;

floatbonus,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;

elseif(i<=2e5)bonus=bonl+(i-100000)*0.075;

elseif(i<=4e5)bonus=bon2+(i-200000)*0.05;

elseif(i<=6e5)bonus=bon4+(i-400000)*0.03;

elseif(i<=1e6)bonus=bon6+(i-600000)*0.015;

elsebonus=bon10+(i-1000000)*0.01;

printf(nbonus=%10.2f,bonus);

)

main()

{longi;

floatbonus,bon1,bon2,bon4,bon6,bon10;

intbranch;

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(u%ldM,&i);

branch=i/100000;

if(branch>10)branch=10;

switch(branch)

{case0:bonus=i*0.1;break;

case1:bonus=bonI+(i-100000)*0.075;break;

case2:

case3:bonus=bon2+(i-200000)*0.05;break;

case4:

case5:bonus=bon4+(i-400000)*0.03;break;

case6:

case7

case8:

case9:bonus=bon6+(i-600000)*0.015;break;

case10:bonus=bon10+(i-1000000)*0.01;

)

printf(nbonus=%10.2f,bonus);

)

4.9

main()

{intt,a,b,c,d;

scanf("％d,%d,%d,%d”,&a,&b,&c,&d);

if(a>b){t=a;a=b;b=t;}

if(a>c){t=a;a=c;c=t;}

if(a>d){t=a;a=d;d=t;}

if(b>c){t=b;b=c;c=t;}

if(b>d){t=b;b=d;d=t;}

if(c>d){t=c;c=d;d=t;}

printf("%d%d%d%d\n”,a,b,c,d);

)

5.10

main()

{inth=10;

floatx,y,x0=2,y0=2,d1,d2,d3,d4;

scanf("％f,%f*',&x,&y);

dl=(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)+(y4-y0)*(y+y0);

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

printf("h=%d",h);

)

第六章循環(huán)控制

6.1

main()

{inta,b,numl,num2,temp;

scanf(n%d,%d,\&numl,&num2);

if(num1<num2){temp=num1;num1=num2;num2=temp;}

a=numl;b=num2;

while(b!=0)

{temp=a%b;

a=b;

b=temp;}

printf("%d\nM,a);

printf(,'%d\n,',numl*num2/a);

)

6.2

#includeHstdio.h"

main()

{chare;

intIetters=0,space=0,digit=0,other=0;

while((c=getchar())!=r\n,)

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

elseif(c=='*)space++;

elseif(c>=>0,&&c<='9')digit++;

elseother++;

)

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

)

6.3

main()

{inta,n,count=1,sn=0,tn=0;

scanf(M%d,%du,&a,&n);

while(count<=n)

{tn+=a;

sn+=tn;

a*=10;

++count;

)

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

}

6.4

main()

{floatn,s=0,t=l;

for(n=l;n<=20;n++)

{t*=n;

s+=t;

)

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

)

6.5

main()

{intNl=100,N2=50,N3=10;

floatk;

floatsl=0,s2=0,s3=0;

for(k=1;k<=N1;k++)sl+=k;

for(k=l;k<=N2;k++)s2+=k*k;

for(k=l;k<=N3;k++)s3+=l/k;

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

)

6.6

main()

{inti,j,k,n;

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

{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);

6.7

#defineM1000

main()

{intk0,k1,k2,k3,k4,k5,k6,k7,k8,k9;

inti,j,n,s;

for(j=2;j<=M;j++)

{n=0;

s=j；

for(i=l;i<j;i++)

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

{n++;

s=s-i;

switch(n)

{casel:kO=i;break;

case2:kl=i;break;

case3:k2=i;break;

case4:k3=i;break;

case5:k4=i;break;

case6:k5=i;break;

case7:k6=i;break;

case8:k7=i;break;

case9:k8=i;break;

case10:k9=i;break;

if(s==O)

{printfC>%d\nu,j);

if(n>l)primf(”％d,%d”,kO,k1);

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

if(n>3)printf(n,%du,k3);

if(n>4)printf(H,%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(n,%d\nu,k9);

)

main()

{staticintk[10];

inti,j,n,s;

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

{n=-l;

s=j；

for(i=l;i<j;i++)

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

{n++;

s=s-i;

k[nj=i;

}

)

if(s==O)

{printf(nj=%d\n,',j);

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

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

printf(n%d\nn,k[n]);

6.8

main()

{intn,t,number=20;

floata=2;b=l;s=0;

for(n=l;n<=number;n++)

{s=s+a/b;

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

)

printf(',s=%9.6f\n,',s);

)

6.9

main()

{floatsn=100.0,hn=sn/2;

intn;

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

{sn=sn+2*hn;

hn=hn/2;

)

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

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

)

6.10

main()

{intday,xl,x2;

day=9;

x2=l;

while(day>0)

{xl=(x2+l)*2;

x2=xl;

day—;

)

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

)

6.11

#includenmath.hn

main()

{floata,xn0,xnl;

scanf("％f',&a);

xn0=a/2;

xnl=(xn0+a/xn0)/2;

do

{xn0=xn1;

xnl=(xn0+a/xn0)/2;

)

while(fabs(xnO-xn!)>=1e-5);

printf(na=%5.2f\n,xnl=%8.2f\n'\a,xnl);

6.12

#include"math.h"

main()

{floatx,xO,f,fl;

x=1.5;

do

{xO=x;

f=((2*x(M)*xO+3)*xO-6;

fl=(6*x0-8)*x0+3;

x=xO-f/f1;

)

while(fabs(x-x0)>=le-5);

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

}

6.13

#include"math.h"

main()

{floatxO,x1,x2,fx0,fxl,fx2;

do

{scanf(H%f,%f',&x1,&x2);

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

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

)

while(fxl*fx2>0);

do

{x0=(xl+x2)/2;

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

if((僅0*fxl)v0)

{x2=x0;

fx2=fx0;

)

else

{xl=xO;

fxl=fxO;

while(fabs(fx0)>=le-5);

printf(,,x0=%6.2f\n',,x0);

)

6.14

main()

{inti,j,k;

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

{for(j=0;j<=2-i;j++)

printf(MM);

for(k=0;k<=2*i;k++)

printf(n*u);

printfCXn1');

)

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

{for(j=0;j<=i;j++)

printf("")；

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

printf("*^,);

printf(n\nn);

6.15

main()

{chari,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(u\na—%c\tb—%c\tc—%c\n",i,j,k);

)

)

)

)

第七章數(shù)組

7.1

#include<math.h>

#defineN101

main()

{inti,j,line,a[N];

for(i=2;i<N;i++)a[i]=i;

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

for(j=i+l;j<N;j++)

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

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

a[j]=O；}

printf(M\n");

for(i=2,line=0;i<N;i++)

{if(a[i]!=O)

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

line++;}

if(line==10)

{printf("\n");

line=O;}

)

)

7.2

#defineN10

main()

{intij,min,temp,a[N];

for(i=0;i<N;i++)

scanf("%d'\&a[i]);

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

{min=i;

for(j=i+1;j<N;j++)

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

temp=a[i];

a[i]=a[min];

a[min]=temp;

I

for(i=0;i<N;i++)

printf(n%5d';a[i]);

)

7.3

main()

{floata[3J[3],sum;

inti,j;

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

for(j=0;jv3;j++)

{scanf("%fn,&sum);

a[i][j]=sum;

)

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

sum=sum+a[i][i];

printf("sum=%f\sum);

7.4

main()

{inta[ll]={1,4,6,9,13,16,19,28,40,100);

inttemp1,temp2,number,end,i,j；

scanf(n%d",&number);

end=a[9];

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

else

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

{if(a[i]>number)

{templ=a[i];

a[i]=number;

for(j=i+l;j<ll;j++)

{temp2=a|j];

a[j]=templ;

templ=temp2;

)

break;

)

)

)

for(i=0;i<ll;i++)

printf(',%6dn,a[i]);

)

7.5

#defineN5

main()

{inta[N]={8,6,5,4,l},i,temp;

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

{temp=alij;

a[i]=a[N-i-l];

alN-i-1J=temp;

)

for(i=0;i<N;i++)

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

)

7.6

#defineN11

main()

{inti,j,a[N][N];

for(i=l;i<N;i++)

{a[i][i]=l；

a[i][l]=l；

for(i=3;i<N;i++)

for(j=2;j<i;j++)

a[i][j]=a[i-l][j-l]+a[i-l][j];

for(i=l;i<N;i++)

{for(j=l；j<=i；j++)

printf(n\nn);

7.7

main()

{inta[16][16],i,j,k,p,m,n;

P=l；

while(p==l)

{scanf(u%d",&n);

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

)

for(i=l;i<=n;i++)

for(j=l;j<=n;j++)

a[i][j]=O；

j=n/2+l;

allJUJ=l；

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

{i=i-l；

j=j+l;

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

{i=i+2;

j=j-l；

)

else

{if(i<l)i=n;

if(j>n)j=l;

)

if(a[i][j]==O)a[i]fj]=k;

else

{i=i+2；

j=j-l；

a[i皿=k;

)

)

for(i=l;i<=n;i++)

{for(j=l；j<=n;j++)

printf("%3d",a[i]|j])；

printf("\n");

7.8

#defineN10

#defineM10

main()

{intij,k,m,n,flagl,flag2,a[N][M],max,maxi,maxj;

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

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

for(j=0;j<m;j++)

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

flag2=0;

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

{max=a[i][0];

for(j=0;j<m;j++)

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

{max=a[i][j];

maxj=j;

)

for(k=0.flag1=1;k<n&&flag1;k++)

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

if(flagl)

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

flag2=l;

)

)

if(!flag2)printf(“NOT")；

)

7.9

#include<stdio.h>

#defineN15

main()

{inti,j,number,top,bott,min,loca,a[N],flag;

charc;

for(i=0;i<=N;i++)

scanf("%d'\&a[i]);

flag=l;

while(flag)

{scanf(u%d",&number);

loca=0;

top=0;

bott=N-l;

if((number<a[O])ll(number>a[N-l]))

loca=-l;

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

{min=(bott+top)/2;

if(number==a[min])

{loca=min;

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

)

elseif(number<a[min])

bott=min-l;

else

top=min+l;

}

if(loca==Ollloca==-1)

printf("%dnotintable\n",number);

printfC^continueY/Nory/n\nu);

c=getchar();

if(c==,N,llc==,n')flag=O;

)

)

7.10

main()

{inti,j,uppn,lown,dign,span,othn;

chartext[3][80];

uppn=lown=dign=span=othn=0;

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

{gets(textlij);

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

{if(textliJ[jJ>=，A,&&textli][jj<=，Z,)

uppn++;

elseif(text[i][j]>=,a,&&text[i]|j]<=,z')

lown++;

elseif(text[i][j]>=<0'&&text[i][j]<=,9,)

dign++;

elseif(textfi]fj]==**)

span++;

else

othn++;

)

I

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

printf(H%s\nu,text[i]);

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

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

printf("dign=%d\nn,dign);

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

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

)

7.11

main()

{staticchara[5]={

inti,j,k;

charspace=,

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

{printf("\n");

for(j=l;j<=3*i;j++)

printf("%lc",space);

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

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

7.12

#include<stdio.h>

main()

{inti,n;

charch[80],tran[80];

gets(ch);

i=0;

while(ch[i]!=W)

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

tran[i]=26+64-ch[i]+l+64;

elseif((ch[i]>=,a,)&&(ch[i]<='z,))

tran[i]=26+96-ch[i]+l+96;

else

tran[i]=ch[i];

i++；

)

n=i;

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

putchar(tran[i]);

)

7.13

main()

{charsi[80],s2[40J;

inti=0,j=0;

scanf("%sM,sl);

scanf(”％s”,s2);

while(sl[i]!='\O,)i++;

while(s2[j]!=,\0,)sl[i+4-]=s2[j++];

sl[i]=\O';

printf(ns=%s\n,',sl);

)

7.14

#include<stdio.h>

main()

{inti,resu;

charsl[100],s2[100];

gets(sl);

gets(s2);

i=0;

while((sl[i]==s2[i])&&(sl[i]!='\0,))i++;

if(sl[i]==,\0'&&s2[i]==W,)resu=0;

else

resu=sl[i]-s2[i];

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

)

7.15

#include"stdio.h"

main()

{charfrom[80],to[80];;

inti;

scanf("%sn,from);

for(i=0;i<=strlen(from);i+4-)

to[i]=from[i];

printf(',%s\n'\to);

)

第八章

8.1

hcf(u,v)

intu,v;

{inta,b,t,r;

if(u>v){t=u;u=v;v=t;}

a=u;b=v;

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

{b=a;a=r;}

return(a);

lcd(u,v,h)

intu,v,h;

{return(u*v/h);}

main()

{intu,v,h,l;

scanf(n%d,%dn,&u,&v);

h=hcf(u,v);

printf(nH.C.F=%d\nn,h);

l=lcd(u,v,h);

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

)

8.2

#include"math.h"

floatxl,x2,disc,p,q;

greater_than_zero(a,b)

floata,b;

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

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

)

equal_to_zero(a,b)

flaota,b;

{xl=x2=-b/(2*a);J

smaller_than_zero(a,b)

floata,b;

{p=-b/(2*a);

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

)

main()

{floata,b,c;

scanf(n%f,%f,%f;&a,&b,&c);

disc=b*b-4*a*c;

if(fabs(disc)<=le-5)

{equal_to_zero(a,b);

printf("xl=%5.2fttx2=%5.2f\n",xl,x2);

}

elseif(disc>0)

{greater_than_zero(a,b);

printf(,rxl=%5.2f\tx2=%5.2f\n';xl,x2);

else

{smaller_than_zero(a,b);

printf(nxl=%5.2f+%5.2fi\tx2=%5.2f-%5.2fi\n';p,q,p,q);

8.3

main()

{intnumber;

scanf(n%dH,&number);

if(prime(number))

printfC'yes");

else

printf("no");

)

intprime(number)

intnumber;

{intflag=l,n;

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

if(number%n==O)

flag=0;

return(flag);

)

8.4

#defineN3

intarraylNJ[NJ;

convert(array)

intarray[3][3J;

{inti,j,t；

for(i=0;i<N;i++)

for(j=i+l;j<N;j++)

{t=array[i][j];

array[i][j]=array|j][i];

array[j][i]=t;

)

)

main()

{intij;

for(i=0;i<N;i++)

for(j=0;j<N;j++)

scanf(n%d';&array[i][jl);

convert(array);

for(i=0;i<N;i++)

{printf(,'\nn);

for(j=0;j<N;j++)

printf(n%5d'\array[i][j]);

8.5

main()

{charstr[100];

scanf(n%sM,str);

inverse(str);

printf(M%s\nn,str);

}

inverse(str)

charstr[];

{chart;

inti,j;

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

{t=str[i];

str[i]=str[j-l];

strfj-l]=t;

8.6

charconcate(str1,str2,str)

charstrl[],str2[],str[];

{intij;

for(i=0;strl[i]!=M)';i++)

str[i]=strl[i];

for(j=0;str2fj]!=r\0';j++)

str[i+j]=str2[j];

str[i+j]=W,;

I

main()

{charsl[100],s2[100],s[100];

scanf(”％s”,sl);

scanf(n%s",s2);

concate(sl,s2,s);

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

)

8.7

main()

{charstr[801,c[80];

voidcpy();

gets(str);

cpy(str,c);

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

voidcpy(s,c)

chars[],c[];

{inti,j;

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

if(s[i]==,a,lls[i]=='A,lls[i]==,e,lls[i]==,E,lls[i]=='i,ll

s[i]==T||s[i]==,o'lls[i]=='O,lls[i]==,u'lls[i]==,U,)

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

cUl='\O';

)

8.8

main()

{charstr[80];

scanf("%s",str);

insert(str);

)

insert(str)

charstr[];

{inti;

for(i=strlen(str);i>0;i—)

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

str[i*2-l]='

)

printf(,,%s\n,',str);

)

8.9

intalph,digit,space,others;

main()

{chartext[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,other

s)；

)

count(str)

charstr[];

{inti;

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

if((str[i]>=,a,&&str[i]<=,z,)ll(str[i]>=,A,&&str[i]<=,Z,))

alph++;

elseif(str[i]>=,0,&&str[i]<='9,)

digit++;

elseif(strcmp(str[i],**)==0)

space++;

else

others++;

)

8.10

intalph(c)

charc;

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

return(l);

else

return(O);

}

intlongest(string)

charstringf];

{intlen=0,i,length=0,flag=1,place,point;

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

if(alph(string[i]))

if(flag)

{point=i;

flag=0;

}

else

len++;

else

{flag=l;

if(len>length)

{length=len;

place=point;

len=0;

)

)

retum(place);

)

main()

{inti;

charline[100];

gets(line);

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

printf(M%cH,line[i]);

printf(n\nn);

8.11

#defineN10

charstrfN];

main()

{inti,flag;

for(flag=l;flag==l;)

{scanf("%s”,str);

if(strlen(str)>N)

printf("inputerror");

else

flag=0;

)

sort(str);

for(i=0;i<N;i++)

)

sort(str)

charstr[N];

{inti,j;

chart;

for(j=l;jvN;j++)

for(i=0;(i<N-j)&&(str[i]!='\0');i++)

if(str[i]>str[i+l])

{t=str[i];

str[i]=str[i+l];

strli+1J=t;

)

)

8.12

#include<math.h>

floatsolut(a,b,c,d)

floata,b,c,d;

{floatx=1,x0,f,fl;

do

{xO=x;

f=((a*x0+b)*x0+c)*x0+d;

fl=(3*a*x0+2*b)*x0+c;

x=x0-f/f1;

)

while(fabs(x-xO)>=le-5);

retum(x);

main()

{floata,b,c,d;

scanf("％f,%f,%f,%f”,&a,&b,&c,&d);

printf(nx=%10.7f\n",solut(a,b,c,d));

)

8.13

main()

{intx,n;

floatp();

scanf("%d,%d",&n,&x);

printf("P%d(%d)=%10.2ftn',,n,x,p(n,x))；

)

floatp(tn,tx)

inttn,tx;

{if(tn==0)

return(l);

elseif(tn==l)

return(tx);

else

retum(((2*tn-1)*tx*p((tn-1),tx)-(tn-1)*p((tn-2),tx))/tn);

I

8.14

#defineN10

#defineM5

floatscore[N][M];

floata_stu[N],a_cor[M];

main()

{inti,j,r,c;

floath;

floats_diff();

floathighest();

r=0;

c=l;

input_stu();

avr_stu();

avr_cor();

printf(M\nnumberclass12345avr");

for(i=0;i<N;i++)

{printf(n\nNO%2d';i4-l);

for(j=0;j<M;j++)

printf(n%8.2f\score[i][j]);

printf(',%8.2f',,a_stu[i]);

)

printf(M\nclassavru);

for(j=Oy<M;j++)

printf(',%8.2f',a_cor(j]);

h=highest(&r,&c);

printf("\n\n%8.2f%d%d\nM,h,r,c);

printf(n\n%8.2f\n",s_diff());

)

input_stu()

{intij;

floatx;

for(i=0;i<N;i++)

{for(j=0;j<M;j++)

{scanf("%f',&x);

score[i][j]=x;

avr_stu()

{intij;

floats;

for(i=0;i<N;i++)

{for(j=0,s=0;j<M;j++)

s+=score[i][j];

a_stu[iJ=s/5.0;

)

)

avr_cor()

{inti,j;

floats;

for(j=0;j<M;j++)

{for(i=0,s=0;i<N;i++)

s+=score[i][j];

a_cor[j]=s/(float)N;

)

)

floathighest(r,c)

int*r,*c;

{floathigh;

inti,j;

high=score[0][0];

for(i=0;i<N;i++)

for(j=0;j<M;j++)

if(score[i][j]>high)

{high=score[i][j];

*r=i+l;

*c=j+l;

}

retuiTi(high);

)

floats_diff()

{inti,j;

floatsumx=0.0,sumxn=0.0;

for(i=0;i<N;i++)

{sumx+=a_stu[i]*a_stu[i];

sumxn+=a__stu[i];

)

retum(sumx/N-(sumxn/N)*(sumxn/N));

I

8.15

#include<stdio.h>

#defineN10

voidinput_e(num,name)

intnum[J;

charname[N][8];

{inti;

for(i=0;i<N;i++)

{scanf(u%d",&num[i]);

gets(name[i]);

)

)

voidsort(num,name)

intnum口；

charname[N][8];

{inti,j,min,templ;

chartemp2[8];

for(i=0;i<N-l;i++)

{min=i;

for(j=i;j<N;j++)

if(num[min]>num|j])min=j;

templ=num[i];

num[i]=num[min];

num[min]=templ;

strcpy(temp2,name[i]);

strcpy(name[i],name[min]);

strcpy(name[min],temp2);

for(i=0;i<N;i++)

printf("\n%5d%10s",num[i],name[i]);

)

voidsearch(n,num,name)

intn,num口；

charname[N][8];

{inttop,bott,min,loca;

loca=0;

top=0;

bott=N-l;

if((n<num[O])ll(n>num[N-1]))

loca=-1;

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

{min=(bott+top)/2;

if(n==num[min])

{loca=min;

printf(nnumber=%d,name=%s\n",n,name[loca]);

)

elseif(n<num[min])

bott=min-1;

else

top=min+l;

)

if(loca==Ollloca==-1)

printf(',numbei-%disnotintable\n'*,n);

)

main()

{intnum[N],number,flag,c,n;

charname[NJ[8J;

input_e(num,name);

sort(num,name);

for(flag=l;flag;)

{scanf(u%d",&number);

search(number,num,name);

printf(Hcontinue?Y/N!M);

c=getchar();

if(c==,N'llc=='n,)

flag=0;

)

}

8.16

#include<stdio.h>

#defineMAX1000

main()

{intc,i,flag,flagl;

chart[MAX];

i=0;

flag=0;

flagl=l;

while((c=getchar())!=\O,&&i<MAX&&flag1)

{if(c>='0,&&c<='9'llc>='A,&&c<=Fllc>=,a,&&c<=,f)

{flag=l;

t[i++]=c;

)

elseif(flag)

{t[iW;

printf("\nnumber=%d\nn,htoi(t));

printfC'continue?");

c=getchar();

if(c==,n'llc=='N,)

flag1=0;

else

{flag=0;

i=0;

)

htoi(s)

charslJ;

{inti,n;

n=0;

for(i=0;s[i]!=*\0';i++)

{if(s[i]>=<0,&&s[i]<=,9,)

n=n*16+s[i]-,0,;

if(slij>=a,&&s[ij<=f)

n=n*16+s[i]-'a'+10;

if(s[i]>='A,&&s[i]<=F)

n=n*16+s[i]-'A'+10;

)

retum(n);

)

8.17

#include<stdio.h>

voidconvert(n)

intn;

{inti;

if((i=n/10)!=0)

convert(i);

putchar(n%10+'0,);

)

main()

{intnumber;

scanf(n%d",&number);

if(number<0)

{putchar('-');

number=-number;

)

convert(number);

)

8.18

main()

{intyear,month,day;

intdays;

scanf(n\n%d,%d,%du,&year,&month,&day);

days=sum_day(month,day);

if(leap(year)&&(month>=3))

days+=1;

printf("days=%d\nn,days);

)

staticintday_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}

intsum_day(month,day)

intmonth,day;

{inti;

for(i=l;i<month;i++)

day+=day_tablij;

retum(day);

)

intleap(year)

intyear;

{intleap;

leap=year%4==0&&year%100!=0llyear%400==0;

retum(leap);

)

第九章編譯預處理

9.1

#defineSWAP(a,b)t=b;b=a;a=t

main()

{inta,b,t;

scanf(H%d,%d",&a,&b);

SWAP(a,b);

printf("a=%d\tb=%d\nn,a,b);

)

9.2

#defineSURPLUS(a,b)((a)%(b))

main()

{inta,b;

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

printf("%dn,SURPLUS(a,b));

)

9.3

#includeHmath.h"

#defineS(a,b,c)((a+b+c)/2)

#defineAREA(a,b,c)(sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c)-c)))

main()

{floata,b,c;

scanf(n%f,%f,%f;&a,&b,&c);

if(a+b>c&&b+c>a&&a+c>b)

printf("area=%8.2f\n",AREA(a,b,c));

else

printf(ninputerror");

)

9.4

#defineLEAP(y)(y%4==0)&&(y%100!=0)ll(y%400==0)

main()

{intyear;

scanf("%dH,&year);

if(LEAP(year))

printfC'yes");

else

printfC'no");

)

8.5

printf(nvalue=%format\tn,x);

printf("value=%format\t,,,x);putchar(,\n');

printf(',value=%format\t,',xl);printf(Hvalue=%format\t',,x2);putchar(,\n');

輸出結(jié)果：

value=5.OOOOOOormatvalue=5.000000ormat

value=3.OOOOOOormatvalue=8.000000ormat

9.6

#definePRprintf

#defineNLH\n"

#defineFs"％f"

#defineF"％6.2f”

#defineFlFNL

#defineF2F"\tnFNL

#defineF3F1VF"\tnFNL

main()

{floata,b,c;

scanf(Fs,&a);

scanf(Fs,&b);

scanf(Fs,&c);

PR(NL);

PR(Fl,a);

PR(Fl,b);

PR(Fl,c);

PR(NL);

PR(F2,a,b);

PR(Fl,c);

PR(NL);

PR(F3,a,b,c);

9.7

/*format.h文件*/

#defineDIGIT(d)printf(n%d\n",d)

#defineFLOAT(f)printf("％8.2f\n”,f)

#defineSTRING(s)printfC'%s\n",s)

/*用戶文件*/

#includenformat.h"

main()

{intd,num;

floatf;

chars[80];

scanf(n%dn,&num);

switch(num)

{casel:scanf(n%dn,&d);

DIGIT(d);

break;

case2:scanf("%f\&f)；

FLOAT(f);

break;

case3:scanf(n%sH,s);

STRING(s);

break;

default:printf(MerrorM);

)

)

9.8

main()

{inta,b,c;

scanf(H%d,%d,%dn,&a,&b,&c);

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

)

max(a,b,c)

inta,b,c;

{intt;

t=x>y?x:y;

retum(t>z?t:z);

)

#defineMAX(a,b)((a)>(b)?(a):(b))

main()

{inta,b,c;

scanf(n%d,%d,%d'\&a,&b,&c);

printf(Hmax=%d\nn,MAX(MAX(a,b),c));

)

9.10

#includenstdio.hH

#defineMAX80

#defineCHANGE1

main()

{charstr[MAXJ;

inti;

scanf(n%sM,str);

#if(CHANGE)

{for(i=0;i<MAX;i++)

{if(str[i]!='\0')

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

str[i]++;

elseif(str[i]==,z,llstr[i]==,Z,)

str[i]-=25;

#endif

printf("\n%s\n,',str);

)

第十章指針

10.1

main()

{intnl,n2,n3;

int*pl,*p2,*p3;

scanf("％d,%d,%d”,&nI,&n2,&n3);

pl=&nl;

p2=&n2;

p3=&n3;

if(n1>n2)swap(pl,p2);

if(n1>n3)swap(pl,p3);

if(n2>n3)swap(p2,p3);

printf(u%d,%d,%d\n",nI,n2,n3);

)

swap(pl,p2)

int*pl,*p2;

{intp;

p=*pl;*pl=*p2;*p2=p;

)

10.2

main()

{char*strl[20],*str2[20],*str3[20];

charswap();

scanf(n%su,strl);

scanf("%su,str2);

scanf(n%su,str3);

if(strcmp(strl,str2)>0)swap(strl,str2);

if(strcmp(strl,str3)>0)swap(strl,str3);

if(strcmp(str2,str3)>0)swap(str2,str3);

printf(',%s\n%s\n%s\n,',strl,