c課后習(xí)題4答案

習(xí)題4

1.#include"iostream.h〃

voidmain()

(

doublea,b,c,max;

cout<<”請輸入三個(gè)數(shù)：“<<endl;

cin>>a>>b?c;

if(a>b)max=a;

elsemax=b;

if(max<c)max=c;

cout<<〃最大數(shù)為：〃《max〈〈endl;

)

3.#include"iostream.h〃

voidmain()

inti,count=0;

for(i=l;i<=1000;i++)

if(i%9==0&&i%ll==0)

cout?i<<，\t);

count++;

if(count%5==0)cout?endl;

)

)

4.If-else語句答案：

#includeiostream.h〃

voidmain()

{

intscore;

cout<〈”請輸入百分制成績：”；

cin?score;

if(score>100||score<0)

cout<<〃輸入的成績有錯(cuò)！〃<Xendl;

else

(

cout〈〈〃\n五分制成績?yōu)椋骸ǎ?/p>

if(score>=90)cout?,A*<<endl;

elseif(score>=80)cout?，B*?endl;

elseif(score>=70)cout<<'C'<<endl;

elseif(score>=60)cout?，D*?endl;

elsecout<<，E*<<endl;

}

)

Switch語句答案：

ttinclude“iostream.h〃

voidmain()

(

intscore;

coutG〃請輸入百分制成績：〃；

cin>>score;

if(score>100||score<0)

cout<〈”輸入的成績有錯(cuò)！"<<endl;

else

(

cout?〃\n五分制成績?yōu)椋骸ǎ?/p>

switch(score/10){

case10:

case9:cout?，A*<<endl;break;

case8:cout?，B'?endl;break;

case7:cout?，C'<<endl;break;

case6:cout?,D'<<endl;break;

default:cout?，E'<<endl;

)

)

)

5.If-else語句答案：

ttinclude"iostream.h〃

voidmain()

(

intbasel,base2,base3,base4,base5,base6,base7,base8;

floatmoney,tax;

basel=0.05*500;

base2=basel+0.1*1500;

base3=base2+0.15*3000;

base4=base3+0.2*15000;

base5=base4+0.25*20000;

base6=base5+0.3*20000;

base7=base6+0.35*20000;

base8=base7+0.4*20000;

coutC〈〃請輸入收入金額：〃；

cin>>money;

if(money<0)

cout<<〃輸入的金額不能是負(fù)數(shù)！”〈〈endl;

else

(

money二money-800;

if(money<=0)tax=0;

elseif(money<=500)tax=money*O.05;

elseif(money<=2000)tax=basel+(money-500)*0.1;

elseif(money<=5000)tax=base2+(money-2000)*0.15;

elseif(money<=20000)tax=base3+(money-5000)*0.2;

elseif(money<=40000)tax=base4+(money-20000)*0.25;

elseif(money<=60000)tax=base5+(money-40000)*0.3;

elseif(money<=80000)tax=base6+(money-60000)*0.35;

elseif(money<=100000)tax=base7+(money-80000)*0.4;

elsetax=base8+(money-100000)*0.45;

cout?〃\n應(yīng)繳稅款為：〃<<tax<〈endl;

}

}

6.#include"iostream.h〃

voidmain()

{

inti,a,b,c,d;

for(i=1000;i<10000;i++)

(

a=i/1000;〃千位

b=i%1000/100;〃百位

c=i%100/10;〃十位

d=i%10;〃個(gè)位

if(a*a*a*a+b*b*b*b+c*c*c*c+d*d*d*d=二i)

cout?i?，\t*;

)

cout<<endl;

)

7.#includeiostream.h，z

ttinclude"math,h"

voidmain()

(

inti,j,m;

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

(

m=sqrt(i);

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

if(i%j==O)break;

if(j>=m+l)

cout?i?,\t);

)

cout<<endl;

)

8.#include"iostream.h〃

voidmain()

(

intbeginCol=5,i,j,m;

for(i=7,j=4;j>0;j—,i-=2)

(

for(m=0;m<beginCo1+4-j;m++)

cout<<''；

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

cout?，*';

cout<<endl;

)

for(i=3,j=2;j<=4;j++,i+=2)

(

for(m=0;m<beginCol+4-j;m++)

cout?，’;

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

cout?，*';

cout<<endl;

)

cout?endl;

)

9.#include“iostream.h〃

voidmain()

(

inti,x,y,z;

for(x=l;x<=9;x++)

for(y=0;y<=9;y++)

for(z=0;z<=9;z++)

if(x!=y&&y!=z&&z!=x&&(x*100+y*10+z)/ll=0)

cout<<x*100+y*10+z?'\t';

cout<<endl;

}

10.#include“iostream.h〃

voidmain