CPrimerPlus第七章程序清单.doc

7.1 calling.cpp#includevoid simple();int main()using namespace std;coutmain() will call the simple() function:endl;simple();coutmain() is finished with the simple() function.endl;return 0;void simple()using namespace std;coutIm but a simple function.endl;7.2 protos.cpp#includevoid cheers(int);double cube(double x);int main()using namespace std;cheers(5);coutside;double volume=cube(side);coutAside-foot cube has a volume of ;coutvolume cubic feet.endl;cheers(cube(2);return 0;void cheers(int n)using namespace std;for (int i=0;in;i+)coutCheers! endl;double cube(double x)return x*x*x;7.3 twoarg.cpp#includeusing namespace std;void n_chars(char,int);int main()int times;char ch;coutch;while (ch!=q)couttimes;n_chars(ch,times);coutendlch;coutThe value of times is timesendl;coutBye0)coutc;7.4 lotto.cpp#includelong double probability(unsigned numbers,unsigned picks);int main()using namespace std;double total,choices;coutEnter the total number of choices on the game card endland the number of picks allowed:totalchoices)&choices=total)coutYou have one chance in ;coutprobability(total,choices);cout of winning.endl;coutNext two numbers (q to quit):;coutbye.0;n-,p-)result=result*n/p;return result;7.5 arrfun1.cpp#includeconst int ArSize=8;int sum_arr(int arr,int n);int main()using namespace std;int cookiesArSize=1,2,4,8,16,64,128;int sum=sum_arr(cookies,ArSize);coutTotal cookies eaten: sumendl;return 0;7.6 arrfun2.cppint sum_arr(int arr,int n)int total=0;for (int i=0;in;i+)total=total+arri;return total;#includeconst int ArSize=8;int sum_arr(int arr,int n);using namespace std;int main()int cookiesArSize=1,2,4,8,16,32,64,128;coutcookies=array address, ;coutsizeof cookies=sizeof cookiesendl;int sum=sum_arr(cookies,ArSize);coutTotal cookies eaten: sumendl;sum=sum_arr(cookies,3);coutFirst three eaters atesum cookies.endl;sum=sum_arr(cookies+4,4);coutLast four eaters ate sum cookies.endl;return 0;int sum_arr(int arr,int n)int total=0;coutarr = arr, ;coutsizeof arr =sizeof arrendl;for (int i=0;in;i+)total=total+arri;return total;7.7. arrfun3.cpp#includeconst int Max=5;int fill_array(double ar,int limit);void show_array(const double ar,int n);void revalue(double r,double ar,int n);int main()using namespace std;double propertiesMax;int size=fill_array(properties,Max);show_array(properties,size);if (size0)coutfactor)cin.clear();while(cin.get()!=n)continue;coutBad input;please enter a number:; revalue(factor,properties,size); show_array(properties,size);coutDone.n;cin.get();cin.get();return 0;int fill_array(double ar,int limit)using namespace std;double temp;int i;for(i=0;ilimit;i+)coutEnter value #(i+1)temp;if(!cin)cin.clear();while(cin.get()!=n)continue;coutBad input;input process terminated.n;break;else if(temp0)break;ari=temp;return i;7.8 arrfun4.cppvoid show_array(const double ar,int n)using namespace std;for(int i=0;in;i+)coutProperty #(i+1): $;coutariendl;void revalue(double r,double ar,int n)for(int i=0;in;i+)ari*=r;#includeconst int ArSize=8;int sum_arr(const int *begin,const int *end);int main()using namespace std;int cookiesArSize=1,2,3,8,16,32,64,128;int sum=sum_arr(cookies,cookies+ArSize);coutTotal cookies eaten: sumendl;sum=sum_arr(cookies,cookies+3);coutFirst three eaters atesum cookies.endl;sum=sum_arr(cookies+4,cookies+8);coutLast four eaters ate sum cookies.endl;return 0;int sum_arr(const int *begin,const int *end)const int *pt;int total=0;for(pt=begin;pt!=end;pt+)total=total+*pt;return total;7.9 strgfun.cpp#includeunsigned int c_in_str(const char *str,char ch);int main()using namespace std;char mmm15=minimum;char *wail=ululate;unsigned int ms=c_in_str(mmm,m);unsigned int us=c_in_str(wail,u);coutms m characters in mmmendl;coutus u characters in wailendl;return 0;7.10 strgback.cppunsigned int c_in_str(const char *str,char ch)unsigned int count=0;while(*str)if(*str=ch)count+;str+;return count;#includechar *buildstr(char c,int n);int main()using namespace std;int times;char ch;coutch;couttimes;char *ps=buildstr(ch,times);coutpsendl;delete ps;ps=buildstr(+,20);coutps-DONE-ps0)pstrn=c;return pstr;7.11 travel.cpp#includestruct travel_timeint hours;int mins;const int Mins_per_hr=60;travel_time sum(travel_time t1,travel_time t2);void show_time(travel_time t);int main()using namespace std;travel_time day1=5,45;travel_time day2=4,55;travel_time trip=sum(day1,day2);coutTwo-day total:;show_time(trip);travel_time day3=4,32;coutThree-day total:;show_time(sum(trip,day3);return 0;travel_time sum(travel_time t1,travel_time t2)travel_time total;total.mins=(t1.mins+t2.mins)%Mins_per_hr;total.hours=t1.hours+t2.hours+(t1.mins+t2.mins)/Mins_per_hr;return total;void show_time(travel_time t)using namespace std;coutt.hours hours, t.mins minutes.endl;7.12 atrctfun.cpp#include#includestruct polardouble distance;double angle;struct rectdouble x;double y;polar rect_to_polar(rect xypos);void show_polar(polar dapos);int main()using namespace std;rect rplace;polar pplace;coutrplace.xrplace.y)pplace=rect_to_polar(rplace);show_polar(pplace);coutNext two numbers(q to qiut): ;coutDone.endl;return 0;polar rect_to_polar(rect xypos)using namespace std;polar answer;answer.distance=sqrt(xypos.x*xypos.x+xypos.y+xypos.y);answer.angle=atan2(xypos.y,xypos.x);return answer;void show_polar(polar dapos)using namespace std;const double Rad_to_deg=57.29577951;coutdistance=dapos.distance;cout,angle=dapos.angle*Rad_to_deg;cout degreesendl; n7.13 atrctptr.cpp#include#includestruct polardouble distance;double angle;struct rectdouble x;double y;void rect_to_polar(const rect *pxy,polar *pda);void show_polar(const polar *pda);int main()using namespace std;rect rplace;polar pplace;coutrplace.xrplace.y)rect_to_polar(&rplace,&pplace);show_polar(&pplace);coutNext two number(q to quit): ;/不一定是q，因为cin其实只能判断字母和数字coutDone.endl;return 0;void show_polar(const polar *pda)using namespace std;const double Rad_to_deg=57.29577951;coutdistance=distance;cout,angle=angle*Rad_to_deg;cout degrees.distance=sqrt(pxy-x*pxy-x+pxy-y*pxy-y);pda-angle=atan2(pxy-y,pxy-x);7.14 topfive.cpp#include#includeusing namespace std;const int SIZE=5;void display(const string sa,int n);int main()string listSIZE;coutEnter your SIZE favorite astronomical sights:endl;for(int i=0;iSIZE;i+)couti+1: ;getline(cin,listi);coutYour list:endl;display(list,SIZE);return 0;void display(const string sa,int n)for(int i=0;in;i+)couti+1: saiendl;7.15 arrobj.cpp#include#include#includeconst int Seasons=4;const std:array Snames=Spring,Summer,Fall,Winter;void fill(std:array * pa);void show(std:array da);int main() std:array expenses;fill(&expenses);show(expenses);return 0;void fill(std:array *pa)using namespace std;for(int i=0;iSeasons;i+)coutEnter Snamesi(*pa)i;void show(std:array da)using namespace std;double total=0.0;coutnEXPENSESn;for(int i=0;iSeasons;i+)coutSnamesi:$daiendl;total+=dai;coutTotal Expenses:$totalendl;7.16 recur.cpp#includevoid countdown(int n);int main()countdown(4);return 0;void countdown(int n)using namespace std;coutCounting down . n0)countdown(n-1);coutn: Kaboom!endl;7.17 ruler.cpp#includeconst int Len=66;const int Divs=6;void subdivide(char ar,int low,int high,int level);int main()char rulerLen;int i;for(i=1;iLen-2;i+)ruleri= ;rulerLen-1=0;int max=Len-2;int min=0;rulermin=rulermax=|;std:coutrulerstd:endl;for(i=1;i=Divs;i+)subdivide(ruler,min,max,i);std:coutrulerstd:endl;for(int j=1;jLen-2;j+) /reset to blank rulerrulerj= ;return 0;void subdivide(char ar,int low,int high,int level)if(level=0)return;int mid=(high+low)/2;armid=|;subdivide(ar,low,mid,level-1);subdivide(ar,mid,high,level-1);7.18 fun_ptr.cpp#includedouble betsy(int);double pam(int);void estimate(int lines,double (*pf)(int);int main()using namespace std;int code;coutcode;coutHeres Bestys estimate:endl;estimate(code,betsy);coutHeres Pams estimate:endl;estimate(code,pam);return 0;double betsy(int lns)return 0.05*lns;double pam(int lns)return 0.03*lns+0.0004*lns*lns;void estimate(int lines,double (*pf)(int)using namespace std;coutlines lines will take ;cout(*pf)(lines) hour(s)endl;7.19 artupt.cpp#includeconst double *f1(const double ar,int n);const double *f2(const double ,int);const double *f3(const double *,int);int main()using namespace std;double av3=1112.3,1542.6,222.9;const