c primer plus 6th

potentially scoped to the beginning of the declaration point to the end of the declaration area. The name in the namespace cannot be used outside of the file to which the unnamed namespace belongs, providing a substitute for a static variable that is linked internally. 3. concept of use of namespaces Instead of using an external global variable, use the variable declared in the named namespace. Use a variable declared in a named namespace instead of using a static global variable.

the ability to closely connect the hardware1.3 Portability and standards　Portability: If you recompile the program without modifying the code, the program will run well, and the program is portableTwo barriers to portability: 1. Hardware-specific programs that are not portable (placing hardware-dependent parts in function modules can minimize portability: this is just a matter of rewriting these modules). 2. Standard issues (establishing a unified C + + standard)There are some differences betwe

of 3 years is:"return 0;}7#include structcar{Charmake[ +];intyear;};intMain () {using namespaceStdintNum Car * cars; cout "How many cars does you wish to catalog:"; CIN >> Num; Cars =NewCar[num]; for(inti =0; i "Car #"1":\ n"; cout "Please enter the Make:";//cin >> cars[i].make;Cin.getline (Cars[i].make, +); Cin.get (); cout "Please enter the year made:"; Cin >> Cars[i].year; } cout "Here is your collection:\ n"; for(inti =0; i " "Delete[] cars;return 0;}8#include #include i

of 3 years is:"return 0;}7#include structcar{Charmake[ +];intyear;};intMain () {using namespaceStdintNum Car * cars; cout "How many cars does you wish to catalog:"; CIN >> Num; Cars =NewCar[num]; for(inti =0; i "Car #"1":\ n"; cout "Please enter the Make:";//cin >> cars[i].make;Cin.getline (Cars[i].make, +); Cin.get (); cout "Please enter the year made:"; Cin >> Cars[i].year; } cout "Here is your collection:\ n"; for(inti =0; i " "Delete[] cars;return 0;}8#include #include i

,const stonewt) as a friend function, and let the Stonewt (double) constructor convert a parameter of type double to a parameter of type STONEWT.② overloads the addition operator to a function that explicitly uses a double type argument: Ⅰ, STONEWT operator + (double X);//member function Ⅱ, friend Stonewt operator+ (double X,STONEWT S );//friend function　　pros and Cons: The first method relies on implicit conversions to make the program shorter because fewer functions are defined. The disadvant

declarations in a class: A struct, class, or enumeration declared in a class declaration is referred to as being nested within a class and scoped to the entire class. This declaration does not create a data object, but simply specifies the type that can be used in the class. If the declaration is made in the private part of the class, the declared type can be used only in that class, and if the declaration is made in the public part, the declared type may be used from the outside of the class

many dice?\n");scanf ("%d", dice);Roll=roll_n_dice (Dice,sides);printf ("You have rolled a%d using%d%dSided dice.\n ", roll,dice,sides);printf ("How many sides?\n");}printf ("The Rollem%d times.\n", roll_count);printf ("good");return 0;}Program Listing 12.14#include #include int main (void){Double *ptd;int Max;int number;int i=0;Puts ("What is the?");scanf ("%d", max);Ptd= (double*) malloc (max*sizeof (double));if (ptd==null){Puts ("Memory allocation faild\n");Exit (Exit_failure);}Puts ("Enter

calculates the tax. Use loops so that users can enter multiple times.#include The ABC Mail Order Grocery Artichoke is priced at $1.25/lb, the beet is priced at $0.65/lb, and the carrot is priced at $0.89/lb. Before adding shipping charges, they offer a 5% discount on orders of $100. Shipping and handling costs of $3.50 are charged for orders of 5 pounds or less, and orders over 5 lbs. and less than 20 lbs. for shipping and handling costs of 1o.oo USD: 20 pounds or more,

::cout;usingStd::endl;intMain () {Cow milk ("a","Eat",56.9);//Cow::cow (const char *NM, const char *ho, double wt)Cow Junk ("T","C",200.66);//Cow::cow (const char *NM, const char *ho, double wt)milk. Showcow (); coutEndl; Cow M1;//Cow::cow ()M1 = milk;//Cow cow::operator= (const COW c)M1. Showcow (); coutEndl; Cow m2= junk;//Cow::cow (const COW c), equivalent to M2 (junk)m2. Showcow (); coutEndl; Cow m3;//Cow::cow ()m3. Showcow (); coutEndl; M3= M1 = m2;//Cow cow::operator= (cons

C primer plus (version 5) programming exercises-Chapter 8 programming exercises, primerplus 1. design a program to count the number of characters from the input to the end of the file. # Include 2. Write a program and read the input as a forward stream until an EOF is encountered. This program prints each input character and its ASCII decimal value. Note that the characters before the space characters i

, the reinterpret_cast operator does not support all type conversions. For example, you can convert a pointer type to an integer that is sufficient to store the pointer representation, and a single cannot convert the pointer to a smaller integer or float type. Another limitation is that you cannot convert a function pointer to a data pointer, or vice versa.In C + +, ordinary class conversions are also restricted. Basically, you can perform other types of conversions,

a set of string constants;cin>>c; The expression also has a return value, for example, C is an integer, but the input is a string, returns false, and the input string is stored in the buffer. The c++ function cannot return a string so it can only return his address. This time the function is to create a new pointer variable length to the length of the string plus 1 the last assignment is the n+1//c++ function pointer--you need to enclose it in parent

intended to be represented.Method of finding Semantic Errors 1: Step-by-step execution of the program and get the results compared to the actual desired results. Of course, this method is cumbersome, but it is very good to find errors in the program. Naturally, for programs that need to iterate 10,000 times ... Please do not try it easily, but you can choose to trace some of the code for analysis;Method 2: Add print to the key point of the program to monitor the operation of the program.It is i

programming emphasizes being independent of a particular type. 6. C + + is Bjarne Stroustrup developed at Bell Labs in the year of the century , incorporating OOP(inspired by simula67 ) , generic programming, and traditional procedural methods. ? 1.3 Portability and standards ?1. portability There are two obstacles: hardware, language differences2. Ansi/iso is specifically responsible for the development of the C + + standard,c++98 is the first C + + standard. ? 1.4 Tips for creating programs

1th Chapter Preparation of knowledge1. Ritchie hopes to have a language that combines the efficiency of low-level languages, the ability to access hardware, and the versatility and portability of high-level languages, so he developed the C language based on the old language.2. After a certain degree of success in C + +, Stroustrup added a template, which makes it possible to perform generic programming.3. To support c++11 in Linux, compile the source file with the-STD = c++0x option:g++-std = c+

conversion function: operator TypeName (); Please note the following points:1) The conversion function must be a class method;2) The conversion function cannot specify a return type (TypeName is already given);3) The conversion function cannot have parameters (already implicitly provided);For example, the prototype converted to a double type is as follows: operator double ();19. Implicit conversion functions should be used sparingly. In principle, it is preferable to use an explic

constants enclosed in quotation marks, string constants that are described by pointers, they are handled by passing their addresses Do not use string constants or pointers that are not initialized to receive input. C + + has three ways of managing data memory: Automatic storage--local variable--stack Static storage, variables declared outside of a function or static storage, variables using the static keyword Dynamic storage of variables---heap->new/delete declarations

[C ++ primer plus] [learning C ++ from Chapter 2] 2. c ++ basic statements // Carrot. CPP -- C ++ basic statement # include 2.1 Definition and Declaration I have never been able to clearly understand these two concepts before. Please clarify them now. int b; Defines an integer variable, that is, B is allocated with storage space suitable for integer variables. At the same time, it is a declaration.

Based on regression, I feel that there is a clear explanation of the relationship between pointers and multi-dimensional arrays in C Primer Plus 5th. Therefore, this blog post is a supplement to the notes that have not been written down before. ------------------------------------------------------------ Split line --------------------------------------------------------- For a simple discussion, we use a s

C ++ Primer Plus learning note-taking class initialization sequence base class constructor, destructor and operator functions operator = cannot be inherited by the derived class; then, when creating a derived class object, how do I call the base class constructor to initialize the base class data ??? The answer is: when executing the constructor, follow the sequence of First Brother (base class), then guest