c++课后题答案钱能第二版

1、1-1#includc<iostrcam>using namespace std;void mainQcout<<Hrm a sttidcntM<<cndl;1-2 #includc<iosircam> using namespace std;ini i,j;void mainQfor(i=l;i<=4;i+)for(j=l;j<=4-i;j+)cout«H ”;for(j=l;j<=2*i-l;j+) cout<<cndl <<cndl;for(i=l;i<=3;i+)歹 r(llr*A

2、Hi;j+)亠nocAA-=-for(ll-jA?2*)；j+) 亠courwJ cour A Acnd 一 A Acndh2,13社 inccdcAiostrcamvusing namespace srd;B-L iRvoid ms.no亠for(ll-AH9;+)COIHAAAA<二 j fbzlll 一AU9 一+) comAACndAAcndk fbr(ll-AH9+) 、-FIH血恿 亠for(ll-l 一Alld+)三COULAAKAA<=j courAACndh courAACndAAcndkfor(TIl;AH9;i+) 、shang 山浊违nocAA-AAf(ii

3、®a9t+)coulca<*a> COLlrAACndAAcndkfor(TI-AH9;i+)亠for(ll-l;All;j+)COIUAA<肿 foAlli一A=9j+)三coulaa*aa<=;三courAACnd 一；3,3#5-ccdcAioslrcamvin# includc<vcctor> #includc<cmath> using namespace std; void main()ini all=6,37,1,4,8,2,9,11,5;vcctor<int> vc(a,a+10);int hc=O;int s

4、um二()；float average；float s;for(int i=0;i<vc.sizcO；i+)sum+=vci;avcragc=sum/vc.sizcQ;for( i=O;i<vc.sizc();i+)hc+=(vc i-average) *(vc i-average);s=sqrt(hc/vc.sizcO);cout«ns='r«s«cndl;4-6# includc<iostrcam>#includc<fsircam>#includc<sstrcam>using namespace std;

5、void mainQint a=0;ifstream in(nr):aaa.txtH);for(string s;gctlinc(in,s);)for(istringstrcam sin(s);sin>>a;)if%3 二二 0)&&(a%5=0)&& (a%7=0)couc«a«H能同时被 3 5 7 整除”vVendl;else if(a%3=0)&&(a%5)&&(a%7)cout«a«"能被3整除不能被5整除也不能被7整除"«cndl;els

6、e if(a%3)&&(2%5二二()&&S%7)cout«a«-能被5整除不能被3整除也不能被7整除n«cndl;else if(a%3)&&(a%5)&&(a%7=0)cout«a«"能被7整除不能被3整除也不能被5整除“vOndl;else if(a%3)&&(a%5)&&(a%7)cout«a«n不能被3 5 7任意一个整除H«cndl;4-8#includc<iosiTcam>using

7、namespace std;void trails form (int);ini n;void mainQ/十进制数转换为二迸制敎cout«H输入要转换的十进制整n«cndl;int num; cin>>num; transform(num);void transfc)rm(int n)if (n<2)cout<<n;else if(n>=2)transf<)rm(n/2);cout<<n%2;5-5#includc<iosiTcam>#includc<fstrcam>#includc<ss

8、trcam># includc<vcctor>#include< algpri thm >using namespace std;t'pcdcf vcctor<vcctor<int> > vii;/vcctor<ini> rcadQvcctor<int>a;ifstrcam in(nD:aaa.txtH);for(string s;gctlinc(in,s);)int c;fbr(istringstrcam sin(s);sin>>c;)a.push_back (c);if(a.cmptyrO)c

9、oui<<nNO ELcmcnt!n<<cndl;elsecout«"从磁盘中读取救据输出结果昱：“<<cndl;for(int i=O;i<a.sizc();i+)cout«ai«" ”；输出读取的數据cout<<cndl<<cndl;return a;int bit_twicc_sum(im a)int sum=O;for(int x=a;x;x/=10)sum+=(x%10)*(x%10);return sum;/bool compare(int suml,int sum2

10、)return bi jtwic jsum(sum l)vbit_twicc_sum(sum2);void inscrt_cout(cctor<int>vc)cout«n请榆入你想插入的数：”<<cndl;int num;cin>>num;vc.push_back(num);sort(vc.bcgin(),vcxndO,compare);cout«cndl«"入数之后，再按各位数字平方之和的大小输出：”<<cndl; for(ini i=O;i<vc.sizc();i+)cout<<vci

11、<<H n;cout<<cndl;/void mainQvcctor<int>7()=：rcadQ;sort(v0.bcginQ,).cnd(),compare);cout«cndl«"按各位救字平方之和的大小输出："<Vendl;for (ini i=O;iVvO.siN 亡 0； i+)cout«)i«H H;cout<<cndl;inscrt_cout(O);# includc<iostrcam>#includc<cmath>using namespa

12、ce std;/class Point protected:double x,y; /x y 轴分量public:void set(doublc ix,double iy)/ 设置坐标x=ix； y=iy；double xoffsctQ/取y轴坐标分量return x;/double yoffsctQ/取x轴坐标分量return y;double angkO/取点的枕坐标return (180/3.14159)*atan2(x);double radiusO取点的枕坐标半径return sqrt(x*x+y*y);void Point: addQx+=5;y+=6; cout«nx=

13、H«x«cndl«ny=H«y«cndl;void main0 Point p;double x,y；cout<<HEntcr x and y:H<<cndl;cin>>x>>y;p.sct(x,y);cout«uanc=n«p.ane()«cndl«t,radius=n«p.radius«cndl«,'xoffsct=：n<<p.xoffsctO<<cndl<<ny offsct=n

14、<<p.yoffsctQ<<cndl;p.addO；8-3# includc<iosircam> #includc<iomanip>using namespace std;class Dateprivate：int year,month,day；public:void sct(int m,int y);void addQ;void print。；;void r)atc：:sct(int djnt m,int y)ycar=y;month 二 m;day=d;void Datc：:addQdav=dav+l:dJ/cout<<

15、;H加一天之后日期是："vvdnyvVundl;void f)atc：:printQcout<<sctfin(,Or);courAASCtw(2)AAdayAA、AASCVW(2)AAmomhAA、AAsctw(4)AAdAI<Acnd 一；、comAASCtfi=(汙void ma5-0亠mLd dd2idlsc5042012)；dl.priso 八d2sc5042012)；d2addo;d2prinr<?wx聲苜<、Timccpp社 klccdcjmch.void Timc:set:(int hjnr m5-r s)亠hourILr miniuzum

16、; sccondus;void TimcuprinrosctfillfO1);cout<<scvw(2)<<hour<<,:,<<sc(2)<<miniic<<1:,<<sc(2)<<sccond<<cndl;#includc,Timc.hH/主函数void mainQTime t;t.set(l 4,47,39)；t.printO；9-1#includc<iosiTcam>using namespace std;class MvClassJint number;public

17、:MyClassO；My Class (int);MyClass();void Display。;/MyCIass:MyClassQcout«nConstructing normally.nH;MyClass:MyClass(int m):numbcr(m)cout<<nConsiTucting with a numbcr:n<<numbcr<<cndl;/void MyClass:DisplayQcout«HDisplay s number:M<<numbcr<<cndl;/MyClass :MyClassOco

18、ut<V"Dc：structingn"/void mainQMyClass objl;MyClass obj2(20);objl.DisplayQ;obj2.DisplayO；9-3 # includc<iostrcam> using namespace std;/class CATint *itsAgc；public:CATQ:itsAgc(nc5XT int(5) CATQdelete itsAgc;int GctAgcQ const return *itsAgc； void SctAgc(int age) *itsAgc=agc;；/ void mainQCAT friskey；cout<<Mfriskey's agc:n<<friskey.GctAgeQ<<cndl; cout<<HSctting friskey to 6nH;friskcy.SctAgc(6);cout<<HCrcating boots from &iskcynH;CAT boot(friskcy)；cout«Hfriskey,s age：H