c++讲解（C++ explains）.docVIP

c++讲解（C++ explains） [4_16] [4_17] to construct a Book class, which contains 2 private data members Qu and price, the establishment of a A 5 element array object, initializes Qu to 1~5 initializes price to Qu 10 Times. Each object is displayed qu*price see: #include iostream.h Class book {public: Book (int a, int b) {qu=a}; price=b; Void (show_money) {coutqu*price} \n; Private: Int Qu, price; }; (main) {book ob[5]={book (1,10), book (2,20), Book (3,30), book (4,40), book (5,50)}; //16 with the following statement /*int i; For (i=0; i5; i++) (ob[i].show_money); 0 * return; //17 problem with the following statement Int i; Book *p; P=ob[4]; For (i=0; i5; i++) {(p-show_money); P--; } Return 0; } [4_18] C++ see page 139 questions #include iostream.h //#include conio.h Class toy {public: Toy () {} Toy (int p, int c) {price=p; Count=c; } Void input (int p, int c); Void (compute); Void (print); Private: Int price; Int count; Long total; }; Void toy:: input (int p, int c) {price=p; Count=c; } Void (toy:: compute) Total= (long) {price*count}; Void (toy:: print) {cout price= price count= count total= total \n;} Void (main) {toy te (2100); / / test constructor Toy *ob; Ob=new toy[6]; Ob[0].input (25130); Ob[0].input (25130); Ob[1].input (30,35); Ob[2].input (15,20); Ob[3].input (25120); Ob[4].input (45,10); Ob[5].input (85,65); For (int i=0; i6; i++) (ob[i].compute); (/ / clrscr); For (i=0; i6; i++) (ob[i].print); Delete ob; } [4_19] to construct a class of stock see page 139: #include iostream.h #include string.h #include conio.h Const int SIZE=80; Class stock {public: (stock) {strcpy (stockcode );} Stock (char code[], int q=1000, float p=8.98) {strcpy (stockcode, code); Quan=q; Price=p; } Void print (void) {coutthis-stockcode; Cout this-quan this-priceendl; } Private: Char stockcode[SIZE]; Int quan; Float price; }; (main) { Stock ST1 (600001, 3000,8.89); (st1.print); Stock st2; Char stockc[]= 600002 ; St2=stockc; (st2.print); Return 0; } Note: the following statements can be d