參考CPrimerPlusV第4單元程序清單

1、4.1 arrayone.cpp#include<iostream>int main()using namespace std;int yams3;yams0=7;yams1=8;yams2=6;int yamcosts3=20,30,5;cout<<"total yams="<<yams0+yams1+yams2<<endl;cout<<"the package with "<<yams1<<" yams costs "<<yamcost

2、s1<<" cents per yam."<<endl;int total=yams0*yamcosts0+yams1*yamcosts1+yams2*yamcosts2;cout<<"the total yam expense is "<<total<<" cents.n"cout<<endl<<"size of yams array= "<<sizeof yams<<" bytes.n"

3、;cout<<"size of yams element= "<<sizeof yams0<<" bytes.n"return 0;4.2 string.cpp#include<iostream>#include<cstring>int main()using namespace std;const int size=15;char name1size;char name2size="c+owboy"cout<<"howdy! i'm "

4、;<<name2<<"!what is your name?n"cin>>name1;cout<<"well, "<<name1<<", your name has "<<strlen(name1)<<" letters and is storedn"cout<<"in an array of "<<sizeof name1<<" bytes."

5、<<endl;cout<<"your initial is "<<name10<<" ."<<endl;name23='0'cout<<"here are the first 3 characters of my name: "<<name2<<endl;return 0;4.3 instr1.cpp#include<iostream>int main()using namespace std;const int

6、 arsize=20;char namearsize;char dessertarsize;cout<<"enter your name:n"cin>>name;cout<<"enter your favorite dessert:n"cin>>dessert;cout<<"i have some delicious "<<dessert<<" for you, "<<name<<".n"

7、return 0;4.4 instr2.cpp#include<iostream>int main()using namespace std;const int arsize=20;char namearsize;char dessertarsize;cout<<"enter your name:n"cin.getline(name,arsize);cout<<"enter your favorite dessert:n"cin.getline(dessert,arsize);cout<<"i h

8、ave some delicious "<<dessert<<" for you, "<<name<<".n"return 0;4.5 instr3.cpp#include<iostream>int main()using namespace std;const int arsize=20;char namearsize;char dessertarsize;cout<<"enter your name:n"cin.get(name,arsize).ge

9、t();cout<<"enter your favorite dessert:n"cin.get(dessert,arsize).get();cout<<"i have some delicious "<<dessert<<" for you, "<<name<<".n"return 0;4.6 numstr.cpp#include<iostream>int main()using namespace std;cout<<

10、;"what year was your house built?n"int year;cin>>year;cout<<"what is its street address?n"char address80;cin.getline(address,80);cout<<"year built: "<<year<<endl;cout<<"address: "<<address<<endl;cout<<"

11、;done!"<<endl;return 0;4.7 strtype1.cpp#include<iostream>#include<string>int main()using namespace std;char charr120;char charr220="jaguar"string str1;string str2="panther"cout<<"enter a kind of feline:"cin>>charr1;cout<<"en

12、ter another kind of feline:"cin>>str1;cout<<"here are some felines:n"<<charr1<<" "<<charr2<<" "<<str1<<" "<<str2<<endl;cout<<"the third letter in "<<charr2<<" is

13、"<<charr22<<endl;cout<<"the third letter in "<<str2<<" is "<<str22<<endl;return 0;4.8 strtype2.cpp#include<iostream>#include<string>int main()using namespace std;string s1="penguin"string s2,s3;cout<<"

14、;you can assign one string object to another:s2=s1n"s2=s1;cout<<"s1: "<<s1<<" , "<<"s2: "<<s2<<endl;cout<<"you can assign a c-style string to a string object.n"cout<<"s2="buzzard"n"s2=&qu

15、ot;buzzard"cout<<"s2: "<<s2<<endl;cout<<"you can concatenate string:s3=s1+s2n"s3=s1+s2;cout<<"s3: "<<s3<<endl;cout<<"you can append string.n"s1+=s2;cout<<"s1+=s2 yields s1= "<<s1<<

16、;endl;s2+="for a day"cout<<"s2+= "for a day" yields s2= "<<s2<<endl;return 0;4.9 strtype3.cpp#include<iostream>#include<string>#include<cstring>int main()using namespace std;char charr120;char charr220="jaguar"string str1;st

17、ring str2="panther"str1=str2;strcpy(charr1,charr2);str1+=" paste"strcat(charr1," juice");int len1=str1.size();int len2=strlen(charr1);cout<<"the string "<<str1<<" contains "<<len1<<" characters.n"cout<<&q

18、uot;the string "<<charr1<<" contains "<<len2<<" characters."<<endl;return 0;4.10 strtype4.cpp#include<iostream>#include<string>#include<cstring>int main()using namespace std;char charr20;string str;cout<<"length of s

19、tring in charr before input: "<<strlen(charr)<<endl;cout<<"length of string in str before input:"<<str.size()<<endl<<endl;cout<<"enter a line of text:n"cin.getline(charr,20);cout<<"you entered "<<charr<<en

20、dl;cout<<"enter another line of text:n"getline(cin,str);cout<<"you entered: "<<str<<endl<<endl;cout<<"length of string in charr after inptu:"<<strlen(charr)<<endl;cout<<"length of string in str after input:"

21、;<<str.size()<<endl;return 0;4.11 structur.cpp#include<iostream>struct inflatablechar name20;float volume;double price;int main()using namespace std;inflatable guest="glorious gloria",1.88,29.99;inflatable pal="audacious arthur",3.12,32.99;cout<<"expa

22、nd your guest list with "<<;cout<<" and "<<<<" !n"cout<<"you can have both for $"cout<<guest.price+pal.price<<" !n"return 0;4.12 assgn.cpp#include<iostream>struct inflatablechar name20; flo

23、at volume;double price;int main()using namespace std;inflatable bouquet="sunflowers",0.20,12.49;inflatable choice;cout<<"bouquet: "<<<<" for $"<<bouquet.price<<endl;choice=bouquet;cout<<"choice: "<<choice.n

24、ame<<" for $"<<choice.price<<endl;return 0;4.13 arrstruc.cpp#include<iostream>struct inflatablechar name20; float volume;double price;int main()using namespace std;inflatable guests2="bambi",0.5,21.99,"godzilla",2000,565.99;cout<<"the

25、guest "<<<<" and "<<<<endl;cout<<"have a combined volume of "<<guests0.volume+guests1.volume<<" cubic feetn"return 0;4.14 address.cpp#include<iostream>int main()using namespace std;int donuts=6

26、;double cups=4.5;cout<<"donuts value="<<donuts;cout<<" and donuts address ="<<&donuts<<endl; cout<<"cups value="<<cups;cout<<" and cups address ="<<&cups<<endl;return 0;4.15 pointer.cpp#includ

27、e<iostream>int main()using namespace std;int updates=6;int *p_updates;p_updates=&updates;cout<<"values:updates="<<updates<<",*p_updates="<<*p_updates<<endl;cout<<"addresses:&updates="<<&updates<<",p_

28、updates="<<p_updates<<endl;*p_updates=*p_updates+1;cout<<"now updates="<<updates<<endl;return 0;4.16 init_ptr.cpp#include<iostream>int main()using namespace std;int higgens=5;int *pt=&higgens;cout<<"value of higgens="<<higg

29、ens<<"address of higgens="<<&higgens<<endl;cout<<"value of *pt="<<*pt<<"value of pt="<<pt<<endl;return 0;4.17 use_new.cpp#include<iostream>int main()using namespace std;int nights=1001;int *pt=new int;*pt=1001; c

30、out<<"nights value="<<nights<<": location "<<&nights<<endl;cout<<"int value="<<*pt<<":location "<<pt<<endl;double *pd=new double;*pd=10000001.0;cout<<"double value="<<*pd<

31、<":location: "<<pd<<endl;cout<<"location of pionter pd:"<<&pd<<endl;cout<<"size of pt="<<sizeof(pt)<<": size of *pt="<<sizeof(*pt)<<endl;cout<<"size of pd="<<sizeof(pd)<

32、;<": size of *pd="<<sizeof(*pd)<<endl;return 0;4.18 arraynew.cpp#include<iostream>int main()using namespace std;double *p3=new double 3;p30=0.2;p31=0.5;p32=0.8;cout<<"p31 is "<<p31<<".n"p3=p3+1;cout<<"now p30 is "&l

33、t;<p30<<" and p31 is "<<p31<<".n"p3=p3-1;delete p3;return 0;4.19 addpnstr.cpp#include<iostream>int main()using namespace std;double wages3=10000.0,20000.0,30000.0;short stacks3=3,2,1;double *pw=wages;short *ps=&stacks0;cout<<"pw="<

34、;<pw<<",*pw="<<*pw<<endl;pw=pw+1;cout<<"add 1 to the pw pointer:n"pw=pw+1;cout<<"pw="<<pw<<",*pw="<<*pw<<endl<<endl;cout<<"ps="<<ps<<",*ps="<<*ps<<

35、endl;ps=ps+1;cout<<"add 1 to the ps pointer:n"cout<<"ps="<<ps<<",*ps="<<*ps<<endl<<endl;cout<<"access two element with array notation"<<endl;cout<<"stacks0="<<stacks0<<",sta

36、cks1="<<stacks1<<endl;cout<<"access two element with pointer notation"<<endl;cout<<"*stacks="<<*stacks<<",*(stacks+1)="<<*(stacks+1)<<endl;cout<<sizeof(wages)<<"=size of wages array"<<

37、;endl;cout<<sizeof(pw)<<"=size of pw pointer"<<endl;return 0;4.20 ptrstr.cpp#include<iostream>#include<cstring>int main()using namespace std;char animal20="bear"const char *bird="wren"char *ps;cout<<animal<<"and"<&l

38、t;bird<<endl;cout<<"enter a kind of animal:"cin>>animal; ps=animal;cout<<ps<<"!"<<endl;cout<<"before using strcpy():n"<<animal<<" at "<<(int *) animal<<endl;cout<<ps<<" at "

39、;<<(int *) ps<<endl;ps=new charstrlen(animal)+1;strcpy(ps,animal);cout<<"after using strcpy():n"cout<<animal<<" at "<<(int *)animal<<endl;cout<<ps<<" at "<<(int *) ps<<endl;delete ps;return 0;4.21 newstrc

40、t.cpp#include<iostream>struct inflatablechar name20;float volume;double price;int main()using namespace std;inflatable *ps=new inflatable;cout<<"enter name of inflatable item:"cin.get(ps->name,20);cout<<"enter volume in cubic feet:"cin>>(*ps).volume;cou

41、t<<"enter price:$"cin>>ps->price;cout<<"name:"<<(*ps).name<<endl;cout<<"volume:"<<ps->volume<<" cubic feetn"cout<<"price;$"<<ps->price<<endl;delete ps;return 0;4.22 delete.cpp

42、#include<iostream>#include<cstring>using namespace std;char *getname(void);int main()char *name;name=getname();cout<<name<<" at "<<(int *)name<<endl;delete name;name=getname();cout<<name<<" at "<<(int *)name<<endl;delete name;return 0;char *getname()char temp80;cout<<"enter last name:"cin>>temp;char *pn=new charstrlen(temp)+1;strcpy(pn,temp);return pn;4.23 mixtypes.cpp#include<iostream>struct antarctica_years_endint year;int main()using namespace std;antarctica_years_end s01,s