C程序设计第三版课后习题答案谭浩强著.docx
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C程序设计第三版课后习题答案谭浩强著
C程序设计(第三版)习题答案(1-6章)谭浩强著
习题答案
第一章
1.5
#include
voidmain()
{
printf("*********\n Verygood!
\n*********\n");
}
1.6
(法一)
#include
main()
{
inta,b,c,max;
scanf("%d,%d,%d",&a,&b,&c);
max=(a>b)?
a:
b;
max=(max>c)?
max:
c;
printf("max=%d\n",max);
}
(法二)
main()
{
inta,b,c,max;
scanf("%d,%d,%d",&a,&b,&c);
if(a>b&&a>c)
max=a;
elseif(b>c)
max=b;
else
max=c;
printf("max=%d\n",max);
}
(法三)
#include
voidmain()
{
intmax(intx,inty,intz);
inta,b,c,d;
scanf("%d,%d,%d",&a,&b,&c);
d=max(a,b,c);
printf("max=%d\n",d);
}
intmax(intx,inty,intz)
{
intA,B;
if(x>y)A=x;
elseA=y;
if(z>A)B=z;
elseB=A;
return(B);
}
第三章
3.3
(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
3.6
aabb (8)cc (8)abc
(7)AN
3.7
main()
{charc1='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);
}
3.8
main()
{intc1,c2;
c1=97;c2=98;
printf("%c%c",c1,c2);
}
3.9
(1)=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
第四章
4.4
main()
{inta,b,c;
longintu,n;
floatx,y,z;
charc1,c2;
a=3;b=4;c=5;
x=1.2;y=2.4;z=-3.6;
u=51274;n=128765;
c1='a';c2='b';
printf("\n");
printf("a=%2db=%2dc=%2d\n",a,b,c);
printf("x=%8.6f,y=%8.6f,z=%9.6f\n",x,y,z);
printf("x+y=%5.2fy+z=%5.2fz+x=%5.2f\n",x+y,y+z,z+x);
printf("u=%6ldn=%9ld\n",u,n);
printf("c1='%c'or%d(ASCII)\n",c1,c1);
printf("c2='%c'or%d(ASCII)\n",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,ffff,-1
COMPUTER,COM
4.6
a=3b=7/
x=8.5y=71.82/
c1=Ac2=a/
4.7
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
4.8
main()
{floatpi,h,r,l,s,sq,sv,sz;
pi=3.1415926;
printf("inputr,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);
}
4.9
main()
{floatc,f;
scanf("%f",&f);
c=(5.0/9.0)*(f-32);
printf("c=%5.2f\n",c);
}
4.10
#include"stdio.h"
main()
{charc1,c2;
scanf("%c,%c",&c1,&c2);
putchar(c1);
putchar(c2);
printf("\n");
printf("%c%c\n",c1,c2);
}
第五章
5.3
(1)0
(2)1(3)1(4)0(5)1
5.4
main()
{inta,b,c;
scanf("%d,%d,%d",&a,&b,&c);
if(a
if(b printf("max=%d\n",c);
else
printf("max=%d\n",b);
elseif(a printf("max=%d\n",c);
else
printf("max=%d\n",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("%d",&x);
if(x<1)y=x;
elseif(x<10)y=2*x-1;
elsey=3*x-11;
printf("y=%d",y);
}
5.6
main()
{intscore,temp,logic;
chargrade;
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)
{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=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)
{case5:
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;
case4:
printf("%d,%d,%d,%d\n",thousand,hundred,ten,indiv);
printf("%d,%d,%d,%d\n",indiv,ten,hundred,thousand);
break;
case3:
printf("%d,%d,%d\n",hundred,ten,indiv);
printf("%d,%d,%d\n",indiv,ten,hundred);
break;
case2:
printf("%d,%d\n",ten,indiv);
printf("%d,%d\n",indiv,ten);
break;
case1:
printf("%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=bon1+(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("bonus=%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("%ld",&i);
branch=i/100000;
if(branch>10)branch=10;
switch(branch)
{case0:
bonus=i*0.1;break;
case1:
bonus=bon1+(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("bonus=%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);
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);
}
第六章循环控制
6.1
main()
{inta,b,num1,num2,temp;
scanf("%d,%d",&num1,&num2);
if(num1a=num1;b=num2;
while(b!
=0)
{temp=a%b;
a=b;
b=temp;}
printf("%d\n",a);
printf("%d\n",num1*num2/a);
}
6.2
#include"stdio.h"
main()
{charc;
intletters=0,space=0,digit=0,other=0;
while((c=getchar())!
='\n')
{if(c>='a'&&c<='z'||c>='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("%d,%d",&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=1;
for(n=1;n<=20;n++)
{t*=n;
s+=t;
}
printf("s=%e\n",s);
}
6.5
main()
{intN1=100,N2=50,N3=10;
floatk;
floats1=0,s2=0,s3=0;
for(k=1;k<=N1;k++)s1+=k;
for(k=1;k<=N2;k++)s2+=k*k;
for(k=1;k<=N3;k++)s3+=1/k;
printf("s=%8.2f\n",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=1;i {if((j%i)==0)
{n++;
s=s-i;
switch(n)
{case1:
k0=i;break;
case2:
k1=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==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()
{staticintk[10];
inti,j,n,s;
for(j=2;j<=1000;j++)
{n=-1;
s=j;
for(i=1;i {if((j%i)==0)
{n++;
s=s-i;
k[n]=i;
}
}
if(s==0)
{printf("j=%d\n",j);
for(i=0;i printf("%d,",k[i]);
printf("%d\n",k[n]);
}
}
}
6.8
main()
{intn,t,number=20;
floata=2;b=1;s=0;
for(n=1;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("hn=%f\n",hn);
}
6.10
main()
{intday,x1,x2;
day=9;
x2=1;
while(day>0)
{x1=(x2+1)*2;
x2=x1;
day--;
}
printf("x1=%d\n",x1);
}
6.11
#include"math.h"
main()
{floata,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);
}
6.12
#include"math.h"
main()
{floatx,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);
}
6.13
#include"math.h"
main()
{floatx0,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