C程序设计教程——设计思想与实现习题解答钱能

二

#include <>

void main()

{ .

#include <> #include <> double

Cylinder(double r, double h); void

main()

{

double radius, height;

cout <<"请输入圆柱体的半径和高:\n";

cin >>radius >>height;

double volume = Cylinder(radius, height);

cout <<"该圆柱体的体积为" <

}

double Cylinder(double r, double h)

{

return r*r*M_PI*h;

}

三

(1) sqrt(pow(sin(x),)

(2) (a*x+(a+x)/(4*a))/2

pow(c,x*x)/sqrt(2*M_PI) n"; break; case 1: cout

<<"只能被 7 整除.\n"; break; case 2: cout <<"

只能被 5 整除.\n"; break; case 3: cout <<"可以被 5,7 整除.\n";

break; case 4: cout <<"

只能被 3 整除.\n"; break; case 5: cout <<"

可以被 3,7 整除.\n"; break; case 6: cout <<"可以被 3,5 整除.\n"; break;

case 7: cout <<"可以被

3,5,7

整除

.\n"; break; }

}

#include <>

void main()

{

int grade; cout <<"please input a number:\n"; cin >>grade; if(grade>100||grade<0)

cout <<"错误的成绩

.\n";

else if(grade>=90)

cout <<"A.\n"; else

if(grade>=80) cout

<<"B.\n"; else

if(grade>=70) cout

<<"C.\n"; else

if(grade>=60) cout

<<"D.\n"; else

cout <<"E.\n";

}

四

1

#include <> #include <>

void main()

{

double sum=1, t=-1, x; int i=1; cout

<<"please input a value:\n"; cin >>x;

do{ t*=(-1)*x/i; sum+=t;

i++; }while(fabs(t)>1e-8);

cout <<"sum=" <

}

2

#include <>

#include <> void main()

{

double sum=1, t=-1, x; cout

<<"please input a value:\n"; cin >>x;

int i=1; while(fabs(t)>1e-8){ t*=(-

1)*x/i; sum+=t; i++; } cout

<<"sum=" <

3

#include <> #include <>

void main()

{

double sum=1, t=-1, x; cout

<<"please input a value:\n"; cin >>x;

for(int i=1; fabs(t)>1e-8; i++){

t*=(-1)*x/i; sum+=t; } cout

<<"sum=" <

}

#include <>

void main()

{

long sum=0, t=1; for(int i=1;

i<=15; i++){ t*=i; sum+=t; }

cout <<"sum=" <

}

#include <>

void main()

{

for(int i=1; i<=9; i++) for(int j=0; j<=9; j++) for(int k=0; k<=9; k++) if(i*i*i+j*j*j+k*k*k == 100*i+10*j+k)

cout <<(100*i+10*j+k) <<"是水仙花数

.\n";

}

#include <>

void main()

{

for(int i=1; i<1000; i++){ int sum=0; for(int j=1; j<=i/2; j++) if(i%j==0) sum+=j;

if(sum==i) cout <

是完

数

.\n";

}

#include <>

void main()

{

float s=100,h=100;

for(int i=1; i<10;

i++){ s+=h; h/=2;

}

cout <<"

共经过" <

#include <> void main()

{ int peachs=1;

for(int i=1;

i<10; i++)

peachs=(peac

hs+1)*2;

cout <<"

第一天共摘下" <

#include <> #include <>

void main()

{

double x, a; cout <<"please input a

value:\n"; cin >>a; x = a/2;

while(fabs((x-a/x)/2)>1e-7)

x=(x+a/x)/2;

cout <

的平方根是" <

}

1

#include <>

void main()

{

for(int i=1; i<=10;

i++){ for(int j=1; j<=10-i; j++)

cout <<" "; for(int j=1; j<=2*i-

1; j++) cout <<"#"; cout

<

}

}

2

#include <>

void main()

{ for(int i=1; i<=8; i++){ for(int

j=1; j<=i; j++) cout <<" ";

for(int j=1; j<=18-i; j++)

cout <<"#"; cout <

}

}

1

#include <> #include <>

void main()

{

cout <<" *"; for(int

i=1; i<=9; i++) cout

<

cout <<"\n-----------------------------------------\n"; for(int i=1; i<=9; i++){ cout <

}

}

2

#include <> #include <>

void main()

{

cout <<" *"; for(int

i=1; i<=9; i++) cout

<

cout <<"\n-----------------------------------------\n"; for(int i=1; i<=9; i++){ cout <

}

}

3

#include <> #include <>

void main()

{ cout <<" *";

for(int i=1;

i<=9; i++)

cout <

<

cout <<"\n-----------------------------------------\n";

for(int i=1; i<=9; i++){ cout <

if(i!=1)

cout <

for(int j=i; j<=9; j++) cout

<

}

}

#include <>

void main()

{ int n; long a=1, b=1, c=1, temp;

cout <<"please input a value:\n";

cin >>n; for(int i=4; i<=n;

i++){ temp=a+c; a=b; b=c; c=temp;

} cout << c <

}

五

#include <> #include <>

#include <> bool

isprime(long n);

void main()

{

.

}

.

}

(2) <

cout <<"please select following operation:\n"; cout <<"\t\tstop at once! ----- 1\n"; cout

<<"\t\tinput again. ------- 2\n"; cout <<"\t\tas default values -- 3\n\n"; int sele=0; cin >>sele; switch(sele){ case 1: return false; case 2: sign=false; break; case 3: num=10; interval=3; return true;

}

(3)

#include <> const size=10; void

findmax(int* a, int n, int& pk); void

main()

{ int a[size];

int n=0;

cout <<"please input " <

for(int i=0; i>a[i]; findmax(a,size,n); cout <<"the maximum is "

<

<<"It's index is " <

}

void findmax(int* a,int n,int& pk)

{ for(int i=1; i

if(a[i]>a[pk])

pk=i;

}

9_2

#include <> #include <>

int& put(int n); .

put(9)=30;

cout <

<

cout <

}

int& put(int n)

{

if(n>=10){ cerr <<"range error in put

value!\n";

exit(1); }

return vals[n];

}

int get(int n)

{

if(n>=10){ cerr <<"range error in get

value!\n"; exit(1); } return vals[n];

}

#include <>

void Swap(char*& str1, char*& str2);

void main()

{

char* ap="hello"; char* bp="how

are you?"; cout <

<

交换以后

:\n"; cout <

<

}

void Swap(char*& str1, char*& str2)

{ char* temp=str1;

str1=str2;

str2=temp;

}

一○

#include <> struct

Student{ int

mathmidterm;

int mathfinal;

};

void main()

{

Student s;

cout <<"please input midterm and final math\n" <<"grade of a student:\n"; cin >> >>;

cout <<"the average grade of midterm and final math is " << + / <

}

10_2

#include <> #include

<> struct Node{ char

str[20]; Node* next;

};

void Insert(Node*& head); void

main()

{

Node* p;

Node* x=new Node;

strncpy(x->str,"hello",20);

x->next = NULL; p =x; x=new

Node;

strncpy(x->str,"jone",20);

x->next = p; p=x;

x=new Node;

strncpy(x->str,"good",20);

x->next = p; p=x;

x=new Node;

strncpy(x->str,"better",20); x->next =

p; p=x; cout <<"\n 插入之前

:\n";

for(Node* pT=p; pT; pT=pT->next) cout <str <<"->"; cout <<"0\n"; Insert(p);

cout <<"\n 插入之后

:\n"; for(Node*

pT=p; pT; pT=pT->next) cout <str <<"->";

cout <<"0\n";

}

void Insert(Node*& head)

{

Node* p=new Node;

strncpy(p->str,"marit",20);

head->str[19]='\0';

if(!head){ head = p;

p->next = NULL; return; }

if(!strcmp(head->str,

"jone")){ p->next = head; head

= p; return; } Node* sp;

for(sp=head; sp->next&& strcmp(sp->next->str,"jone"); sp=sp->next); p->next = sp->next;

sp->next = p;

}

10_3

#include <> struct Node{

char c;

Node* next;

};

Node* reverse(Node* head);

void main()

{

Node x[4]; for(int i=0; i<4;

i++){ x[i].c='A'+i; cout <";

x[i].next = &x[i+1]; } cout <<"NULL"

<

reverse(x); for(Node* pH=head; pH;

pH=pH->next) cout <c <<"->"; cout

<<"NULL" <

}

Node* reverse(Node* head)

{

Node* newHead=NULL; for(Node*

pT=head; pT;

pT=head){ head=head->next;

pT->next = newHead; newHead = pT; }

return newHead;

}

10_4 (1) #include <>

struct Lnode

{

double data; Lnode*

next;

};

void ShowList(Lnode* head)

{ for(Lnode* p=head; p; p=p->next) cout <data <

}

void AddToEnd(Lnode* pnew, Lnode*& head) {

if(!head)

head=pnew; else{

Lnode* p; for(p=head; p->next;

p=p->next); p->next = pnew;

}

pnew->next=NULL;

}

Lnode* GetNode()

{

Lnode* item = new Lnode;

if(item){ item->next=NULL;

item->data=; }else cout

<<"Nothing allocated\n"; return item;

}

void main()

{

Lnode* head=NULL; Lnode* temp; double d; cout <<"data? "; cin >>d; while(d>0&&(temp=GetNode())){ te

mp->data=d; AddToEnd(temp, head); cout <<"data? "; cin >>d; }

ShowList(head);

}

(2) data?

3 data? 5

data? 7

data? 6

data? 4

data? 8

data? -3

3

5

7

6

4

8

(3)

#include <>

struct Lnode

{

double data; Lnode*

next;

};

void ShowList(Lnode* head); void AddToEnd(Lnode* pnew, Lnode*& head); Lnode* GetNode(); void DeleteList(Lnode* head); void main()

{

Lnode* head=NULL; Lnode* temp;

double d; cout <<"data? "; cin >>d;

while(d>0&&(temp=GetNode())){ te

mp->data=d; AddToEnd(temp, head);

cout <<"data? "; cin >>d; }

ShowList(head);

DeleteList(head);

}

void ShowList(Lnode* head)

{ if(head){

cout

<

data

<

if(head->next)

ShowList(head->next);

n";

();

}

11_3

#ifndef DATE

#define DATE #include

<> class Date{ public:

void Display(); void AddOneDay(); void SetDay(int

y,int m,int d); protected: bool

Legal(int y, int m, int d); bool

IsLeapYear(int y); int year; int

month; int day;

};

void Date::Display()

{

cout <

}

void Date::AddOneDay()

{

if(Legal(year,month,day+1)) day++;

else if(Legal(year,month+1,1))

month++,day=1;

else if(Legal(year+1,1,1))

day=1,month=1,year++;

}

void Date::SetDay(int y, int m, int d)

{

if(Legal(y,m,d))

day=d, month=m, year=y;

}

bool Date::Legal(int y, int m, int d)

{

if(y>9999||y<1||d<1||m<1||m>12)

return false; int dayLimit=31;

switch(m) case 4: case 6: case 9: case 11: dayLimit--; if(m==2) dayLimit = IsLeapYear(y) ? 29 : 28;

return (d>dayLimit)? false : true;

}

bool Date::IsLeapYear(int y)

{

return !(y%4)&&(y%100)||!(y%400);

}

#endif

11_4 #include ""

void main()

{

Time a;

(3,32,48);

();

}

11_5

#include <> #include ""

void main()

{

Stack sta;

(10); (12); (14); cout

<<() <

<

}

n";

}

n"; exit(1); } int result = head->a; Node* p = head; head = head->next; delete p; return result;

}

Constructing with a number: 20

Display a number: 1

Display a number: 20

Destructing. Destructing.

12_2 ,"Revere","CA","12290"); ();

("Richard Voss"); ();

}

物质一三

13_1

生物

有机物

动物

哺乳

人

动物

类猿类

猫科类

...

卵生动物

植物

非生

物无机物

13_2

Ignore

一四

14_1

Multi[0] is:0

Multi[1] is:1 Multi[2]

is:4 Multi[3] is:9

Multi[4] is:16 Multi[5]

is:25 Multi[6] is:36

Multi[7] is:49 Multi[8]

is:64

Multi[9] is:81 Destroying..9

Destroying..8

Destroying..7

Destroying..6 Destroying..5 Destroying..4 Destroying..3 Destroying..2 Destroying..1 Destroying..0

14_2

#include <> #include <> class Vector{ public: Vector(int

s=100); Vector(const Vector& v); int& Elem(int ndx); void Display(); void

Set(); ~Vector(); protected:

int size; int* buffer;

};

Vector::Vector(int s)

{

buffer=new int[size=s]; for(int

i=0; i

buffer[i]=i*i;

}

Vector::Vector(const Vector& v):size {

buffer = new int[size]; for(int

i=0; i

buffer[i] = [i];

}

int& Vector::Elem(int ndx)

{

if(ndx<0||ndx>=size){ cout

<<"error in index" <

exit(1);

} return buffer[ndx];

}

void Vector::Display()

{ for(int j=0; j

cout <

}

void Vector::Set()

{ for(int j=0; j

buffer[j]=j+1;

}

Vector::~Vector(){ delete[]buffer; }

void main()

{

Vector a(10); Vector

b(a); ();

();

}

14_2

.\n"; (6);

cout <<"Creating boots from frisky\n"; CAT

boots(frisky);

cout <<"frisky's age:" <<() <

<<"boots'age:" <<() <

cout <<"frisky's age:" <<() <

cout <<"boots'age:" <<() <

}

一五

15_1 (1)

Return\n"

<<"1. Savings business\n"

<<"2. Checking business\n\n"

<<"select : "; cin >>sele;

if(sele==1||sele==2) DoAccess(sele);

if(sele==0) break; } Return\n"

<<"1. Fetching\n"

<<"2. Saving\n\n"

<<"select : "; cin >>sele;

if(sele==1||sele==2)

if(s==1) DoSavings(sele);

else

DoChecking(sele);

if(sele==0) break; }

Return\n"

<<"1. Savings business\n"

<<"2. Checking business\n"

<<"3. Credit business\n\n"

<<"select : "; cin >>sele;

if(sele>=1 && sele <=3) DoAccess(sele); }

Account* p=Account::First(); Return\n"

<<"1. Fetching\n"

<<"2. Saving\n\n" <<"select : ";

cin >>sele; if(sele!=1 && sele!=2)

continue; switch(type){ case

1: DoSavings(sele); break; case 2:

DoChecking(sele); break;

case 3: DoCredit(sele); break;

}

}

}

void DoSavings(int access)

{

unsigned aN; float val; if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

void DoChecking(int access)

{

unsigned aN; float

val;

if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

void DoCredit(int access)

{

unsigned aN; float

val;

if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

16_5

#include <>

#include "i:\c++答案

\ch16\" #include "i:\c++

答案

\ch16\"

#include "i:\c++答案

\ch16\"

#include "i:\c++答案

\ch16\16_4\"

#include ""

void DoSavings(int access);

void DoChecking(int access);

void DoAccess(int type); void

DoCredit(int access);

void DoFixed(int access);

void main()

{ int sele=1;

while(sele){

cout <<"\nbank management\n\n" <<"0. Return\n"

<<"1. Savings business\n"

<<"2. Checking business\n"

<<"3. Credit business\n"

<<"4. Fixed business\n\n"

<<"select : ";

cin >>sele;

if(sele>=1 && sele <=4) DoAccess(sele);

}

Account* p=Account::First(); Return\n"

<<"1. Fetching\n"

<<"2. Saving\n\n"

<<"select : "; cin >>sele;

if(sele!=1 && sele!=2) continue;

switch(type){

case 1: DoSavings(sele); break; case 2: DoChecking(sele); break; case 3: DoCredit(sele); break; case 4: DoFixed(sele);

}

}

}

void DoSavings(int access)

{

unsigned aN; float val; if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

void DoChecking(int access)

{

unsigned aN; float

val;

if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

void DoCredit(int access)

{

unsigned aN; float

val;

if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n"; cin >>aN >>val; } }

}

void DoFixed(int access)

{

unsigned aN; float

val;

if(access==2){ n";

cout <<"\nplease input a account number and amount for fetching(input 0 for end):\n";

cin >>aN >>val;

}

}

}

一七

class

A{ public:

int GetpA(){ return pA; }

void SetpA(int a){ pA=a; }

private: int pA;

};