c++课后题答案钱能第二版.docx

1、c+课后题答案钱能第二版1-1#includeusing namespace std; void main() coutIm a studentendl;1-2#includeusing namespace std;int i,j;void main() for(i=1;i=4;i+) for(j=1;j=4-i;j+) cout ; for(j=1;j=2*i-1;j+) cout*; coutendlendl; for(i=1;i=3;i+) for(j=1;j=i;j+) cout ; for(j=1;j=(7-2*i);j+) cout*; coutendlendl; 2-13#inc

2、ludeusing namespace std;int i,j;void main() for(i=1;i=9;i+) coutit; for(i=1;i=9;i+) cout-t; coutendlendl; for(i=1;i=9;i+) /下三角形式 for(j=1;j=i;j+) / couti*jt; / coutendl; coutendlendl; for(i=1;i=9;i+) /shang三角形式 coutti; for(i=0;i9;i+) coutt-; coutendlendl; for (i=1;i=9;i+) for(j=1;j=i;j+) coutt; for(j

3、=i;j=9;j+) / couti*jt; / coutendl; 3-3#include#include#include using namespace std; void main() int a11=6,3,7,1,4,8,2,9,11,5; vector ve(a,a+10); int he=0; int sum=0; float average; float s; for(int i=0;ive.size();i+) sum+=vei; average=sum/ve.size(); for( i=0;ive.size();i+) he+=(vei-average)*(vei-ave

4、rage); s=sqrt(he/ve.size(); couts=sendl;4-6#include#include#includeusing namespace std;void main() int a=0; ifstream in(D:aaa.txt); for(string s;getline(in,s);) for(istringstream sin(s);sina;) if(a%3=0)&(a%5=0)&(a%7=0) couta能同时被3 5 7整除endl; else if(a%3=0)&(a%5)&(a%7) couta能被3整除 不能被5整除 也不能被7整除endl; e

5、lse if(a%3)&(a%5=0)&(a%7) couta能被5整除 不能被3整除 也不能被7整除endl; else if(a%3)&(a%5)&(a%7=0) couta能被7整除 不能被3整除 也不能被5整除endl; else if(a%3)&(a%5)&(a%7) couta不能被3 5 7 任意一个整除endl; 4-8#includeusing namespace std;void transform(int );int n;void main() /十进制数转换为二进制数 cout输入要转换的十进制整数：num; transform(num); void transform

6、(int n) if (n2) cout=2) transform(n/2); coutn%2; 5-5#include#include#include#include#includeusing namespace std;typedef vectorvector vii;/-vector read() vectora; ifstream in(D:aaa.txt); for(string s;getline(in,s);) int c; for(istringstream sin(s);sinc;) a.push_back (c); if(a.empty() coutNO ELement!e

7、ndl; else cout从磁盘中读取数据输出结果是：endl; for(int i=0;ia.size();i+) coutai ; /输出读取的数据 coutendlendl; return a; /- int bit_twice_sum(int a) int sum=0; for(int x=a;x;x/=10) sum+=(x%10)*(x%10); return sum; /- bool compare(int sum1,int sum2) return bit_twice_sum(sum1)bit_twice_sum(sum2); /- void insert_cout(vect

8、orve) cout请输入你想插入的数：num; ve.push_back(num); sort(ve.begin(),ve.end(),compare); coutendl插入数之后，再按各位数字平方之和的大小输出：endl; for(int i=0;ive.size();i+) coutvei ; coutendl; /-void main() vectorv0=read(); sort(v0.begin(),v0.end(),compare); coutendl按各位数字平方之和的大小输出：endl; for(int i=0;iv0.size();i+) coutv0i ; couten

9、dl; insert_cout(v0); /-8-1#include#includeusing namespace std;/-class Pointprotected: double x,y; /x y 轴分量public: void set(double ix,double iy)/设置坐标 x=ix; y=iy; /-double xoffset()/取y轴坐标分量 return x;/-double yoffset()/取x轴坐标分量 return y;/-double angle()/取点的极坐标 return (180/3.14159)*atan2(y,x);/-double ra

10、dius()/取点的极坐标半径 return sqrt(x*x+y*y);void Point: add() x+=5; y+=6; coutx=xendly=yendl;void main() Point p; double x,y; coutEnter x and y:xy; p.set(x,y); coutangle=p.angle()endlradius=p.radiusendlx offset=p.xoffset()endly offset=p.yoffset()endl; p.add();8-3#include#includeusing namespace std;class Da

11、teprivate: int year,month,day;public: void set(int d,int m,int y); void add(); void print();void Date:set(int d,int m,int y) year=y; month=m; day=d;void Date:add() day=day+1; /cout加一天之后日期是：dayendl;void Date:print() coutsetfill(0); coutsetw(2)day/setw(2)month/setw(4)yearendl; /coutsetfill( );void mai

12、n() Date d1,d2; d1.set(10,4,2012); d1.print(); d2.set(10,4,2012); d2.add(); d2.print();8-4/*多文件结构*/Time.cpp#includeTime.h void Time:set(int h,int m,int s) hour=h; minite=m; second=s;void Time:print() setfill(0); coutsetw(2)hour:setw(2)minite:setw(2)secondendl;#includeTime.h/主函数void main() Time t; t.

13、set(14,47,39); t.print();9-1#includeusing namespace std;class MyClass int number;public: MyClass(); MyClass(int); MyClass(); void Display();/-MyClass:MyClass()coutConstructing normally.n;/-MyClass:MyClass(int m):number(m) coutConstructing with a number:numberendl;/-void MyClass:Display()coutDisplay

14、s number:numberendl;/-MyClass :MyClass()coutDestructing.n;/-void main() MyClass obj1; MyClass obj2(20); obj1.Display(); obj2.Display();/-9-3#includeusing namespace std;/-class CAT int *itsAge;public: CAT():itsAge(new int(5) CAT()delete itsAge; int GetAge() const return *itsAge; void SetAge(int age)*

15、itsAge=age;/-void main() CAT friskey; coutfriskeys age:friskey.GetAge()endl; coutSetting friskey to 6n; friskey.SetAge(6); coutCreating boots from friskeyn; CAT boot(friskey); coutfriskeys age:friskey.GetAge()endl; coutboots age: boot.GetAge()endl; coutsetting friskey to 7n; friskey.SetAge(7); coutfriskrys age: friskey.GetAge()endl; coutboots age: boot.GetAge()endl; -精心整理，希望对您有所帮助!