CPrimerPlus(V)第4单元程序清单.doc

4.1 arrayone.cpp#includeint main()using namespace std;int yams3;yams0=7;yams1=8;yams2=6;int yamcosts3=20,30,5;coutTotal yams=yams0+yams1+yams2endl;coutThe package with yams1 yams costs yamcosts1 cents per yam.endl;int total=yams0*yamcosts0+yams1*yamcosts1+yams2*yamcosts2;coutThe total yam expense is total cents.n;coutendlSize of yams array= sizeof yams bytes.n;coutSize of yams element= sizeof yams0 bytes.n;return 0;4.2 string.cpp#include#includeint main()using namespace std;const int Size=15;char name1Size;char name2Size=C+owboy;coutHowdy! Im name2name1;coutWell, name1, your name has strlen(name1) letters and is storedn;coutin an array of sizeof name1 bytes.endl;coutYour initial is name10 .endl;name23=0;coutHere are the first 3 characters of my name: name2endl;return 0;4.3 instr1.cpp#includeint main()using namespace std;const int ArSize=20;char nameArSize;char dessertArSize;coutname;coutdessert;coutI have some delicious dessert for you, name.n;return 0;4.4 instr2.cpp#includeint main()using namespace std;const int ArSize=20;char nameArSize;char dessertArSize;coutEnter your name:n;cin.getline(name,ArSize);coutEnter your favorite dessert:n;cin.getline(dessert,ArSize);coutI have some delicious dessert for you, name.n;return 0;4.5 instr3.cpp#includeint main()using namespace std;const int ArSize=20;char nameArSize;char dessertArSize;coutEnter your name:n;cin.get(name,ArSize).get();coutEnter your favorite dessert:n;cin.get(dessert,ArSize).get();coutI have some delicious dessert for you, name.n;return 0;4.6 numstr.cpp#includeint main()using namespace std;coutyear;coutWhat is its street address?n;char address80;cin.getline(address,80);coutYear built: yearendl;coutAddress: addressendl;coutDone!endl;return 0;4.7 strtype1.cpp#include#includeint main()using namespace std;char charr120;char charr220=jaguar;string str1;string str2=panther;coutcharr1;coutstr1;coutHere are some felines:ncharr1 charr2 str1 str2endl;coutThe third letter in charr2 is charr22endl;coutThe third letter in str2 is str22endl;return 0;4.8 strtype2.cpp#include#includeint main()using namespace std;string s1=penguin;string s2,s3;coutYou can assign one string object to another:s2=s1n;s2=s1;couts1: s1 , s2: s2endl;coutYou can assign a C-style string to a string object.n;couts2=buzzardn;s2=buzzard;couts2: s2endl;coutYou can concatenate string:s3=s1+s2n;s3=s1+s2;couts3: s3endl;coutYou can append string.n;s1+=s2;couts1+=s2 yields s1= s1endl;s2+=for a day;couts2+= for a day yields s2= s2endl;return 0;4.9 strtype3.cpp#include#include#includeint main()using namespace std;char charr120;char charr220=jaguar;string str1;string str2=panther;str1=str2;strcpy(charr1,charr2);str1+= paste;strcat(charr1, juice);int len1=str1.size();int len2=strlen(charr1);coutThe string str1 contains len1 characters.n;coutThe string charr1 contains len2 characters.endl;return 0;4.10 strtype4.cpp#include#include#includeint main()using namespace std;char charr20;string str;coutLength of string in charr before input: strlen(charr)endl;coutLength of string in str before input:str.size()endlendl;coutEnter a line of text:n;cin.getline(charr,20);coutYou entered charrendl;coutEnter another line of text:n;getline(cin,str);coutYou entered: strendlendl;coutLength of string in charr after inptu:strlen(charr)endl;coutLength of string in str after input:str.size()endl;return 0;4.11 structur.cpp#includestruct 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;coutExpand your guest list with ;cout and !n;coutYou can have both for $;coutguest.price+pal.price !n;return 0;4.12 assgn.cpp#includestruct inflatablechar name20; float volume;double price;int main()using namespace std;inflatable bouquet=sunflowers,0.20,12.49;inflatable choice;coutbouquet: for $bouquet.priceendl;choice=bouquet;coutchoice: for $choice.priceendl;return 0;4.13 arrstruc.cpp#includestruct inflatablechar name20; float volume;double price;int main()using namespace std;inflatable guests2=Bambi,0.5,21.99,Godzilla,2000,565.99;coutThe guest and endl;couthave a combined volume of guests0.volume+guests1.volume cubic feetn;return 0;4.14 address.cpp#includeint main()using namespace std;int donuts=6;double cups=4.5;coutdonuts value=donuts;cout and donuts address =&donutsendl; coutcups value=cups;cout and cups address =&cupsendl;return 0;4.15 pointer.cpp#includeint main()using namespace std;int updates=6;int *p_updates;p_updates=&updates;coutValues:updates=updates,*p_updates=*p_updatesendl;coutAddresses:&updates=&updates,p_updates=p_updatesendl;*p_updates=*p_updates+1;coutNow updates=updatesendl;return 0;4.16 init_ptr.cpp#includeint main()using namespace std;int higgens=5;int *pt=&higgens;coutValue of higgens=higgens;Address of higgens=&higgensendl;coutValue of *pt=*pt;Value of pt=ptendl;return 0;4.17 use_new.cpp#includeint main()using namespace std;int nights=1001;int *pt=new int;*pt=1001; coutnights value=nights: location &nightsendl;coutint value=*pt:location ptendl;double *pd=new double;*pd=10000001.0;coutdouble value=*pd:location: pdendl;coutlocation of pionter pd:&pdendl;coutsize of pt=sizeof(pt): size of *pt=sizeof(*pt)endl;coutsize of pd=sizeof(pd): size of *pd=sizeof(*pd)endl;return 0;4.18 arraynew.cpp#includeint main()using namespace std;double *p3=new double 3;p30=0.2;p31=0.5;p32=0.8;coutp31 is p31.n;p3=p3+1;coutNow p30 is p30 and p31 is p31.n;p3=p3-1;delete p3;return 0;4.19 addpnstr.cpp#includeint main()using namespace std;double wages3=10000.0,20000.0,30000.0;short stacks3=3,2,1;double *pw=wages;short *ps=&stacks0;coutpw=pw,*pw=*pwendl;pw=pw+1;coutadd 1 to the pw pointer:n;pw=pw+1;coutpw=pw,*pw=*pwendlendl;coutps=ps,*ps=*psendl;ps=ps+1;coutadd 1 to the ps pointer:n;coutps=ps,*ps=*psendlendl;coutaccess two element with array notationendl;coutstacks0=stacks0,stacks1=stacks1endl;coutaccess two element with pointer notationendl;cout*stacks=*stacks,*(stacks+1)=*(stacks+1)endl;coutsizeof(wages)=size of wages arrayendl;coutsizeof(pw)=size of pw pointerendl;return 0;4.20 ptrstr.cpp#include#includeint main()using namespace std;char animal20=bear;const char *bird=wren;char *ps;coutanimalandbirdendl;coutanimal; ps=animal;coutps!endl;coutBefore using strcpy():nanimal at (int *) animalendl;coutps at (int *) psendl;ps=new charstrlen(animal)+1;strcpy(ps,animal);coutAfter using strcpy():n;coutanimal at (int *)animalendl;coutps at (int *) psendl;delete ps;return 0;4.21 newstrct.cpp#includestruct inflatablechar name20;float volume;double price;int main()using namespace std;inflatable *ps=new inflatable;coutname,20);cout(*ps).volume;coutps-price;coutName:(*ps).nameendl;coutVolume:volume cubic feetn;coutPrice;$priceendl;delete ps;return 0;4.22 delete.cpp#include#includeusing namespace std;char *getname(void);int main()char *name;name=getname();coutname at (int *)nameendl;delete name;name=getname();coutname at (int *)nameendl;delete name;return 0;char *getname()char temp80;couttemp;char *pn=new charstrlen(temp)+1;strcpy(pn,temp);