C++

Previous Chapter Portal: http://www.jb51.net/article/55088.htm In this chapter we'll learn a little demo, the scene from the previous chapter: C + + Gets a string of global variables from LUA. 1. Introduction of header Files Let's take a look at

Smart pointers (smart pointer) are classes that store pointers to dynamically allocated (heap) objects for lifetime control, ensuring that dynamically allocated objects are automatically and correctly destroyed, preventing memory leaks. A common

The fgetc () and FPUTC () functions can read and write only one character at a time, and the actual development often reads a string or a block of data each time, which can significantly improve efficiency. Read String function fgets The fgets ()

One, prepare to work 1, login into the VPS Control Panel, ready to reboot the VPS at any time. 2, shut down the Web server first, too much load will cause the subsequent operation is difficult, or even directly unable to login SSH. 3, just in

Random.next () returns nonnegative random numbers; Random.next (INT) returns a nonnegative random number that is less than the specified maximum value Random.next (int,int) returns a random number within a specified range, for example ( -100,0)

Introduction to Lambda Programmers familiar with Python should be no stranger to the Lambda . In simple terms, alambda is an anonymous, callable block of code. In the new C++11 standard, theLambda has the following format: [Capture List]

The C language does not limit the number of branches that if else can handle, but when there are too many branches, it is not convenient to use if else, and it is easy to have an if else pairing error. For example, enter an integer that outputs the

In high school mathematics, we have learned logic operations, such as p for true proposition, Q on false proposition, then "P and Q" is false, "p or Q" For true, "non q" is true. In the C language, there are similar logical operations:

The mathematical library function declaration in the MATH.H, mainly includes: 1. ABS (x) to calculate the absolute value of integer number x2, cos (x) x (radian) cosine3, Fabs (x) to find the absolute value of the floating-point number X4, Ceil (x)

Use C # to write a calculator. The following figure, can complete the basic arithmetic. Of course, this program is not even a self-contained calculator with Windows accessories.However, the logic of this program is still very worthwhile to think

The only way to create a new process in Linux is to use the fork () function. The fork () function is a very important function in Linux, and there are some differences from previous functions, because the fork () function looks like it executes

Let's go back to what is a pointer? What is a constant? A pointer is a special variable in which the contents are stored as memory addresses. A constant is the amount of content stored inside it that cannot be changed. Having understood these two

In C + +, the temporary object calls the destructor as soon as it is not needed, releasing the resource it occupies, while the named object invokes the destructor in turn, in reverse order of creation. C + + Source: Copy Code code as follows:

The arrays in C + + are very pits, are there any data types like the list in Python? It's like vector!. A vector is a collection of objects of the same type, each of which has a corresponding integer index value. As with a string object, the

C + + Novice Code, please forgive me.C + + written in a simple console version of the minesweeper game. The player opens the box by entering the coordinates of the square.is just a prototype, can let the player perform turn the box operation and

When you construct various types of data into strings, the powerful features of sprintf rarely disappoint you. Because sprintf is almost the same as printf in usage, it's just a different destination for printing, which is printed to a string, and

As the name suggests, a function pointer is a pointer to a function. It is a pointer to a function. See Example: A char * (*FUN1) (char * P1,char * p2); B char * *FUN2 (char * p1,char * p2); C char * FUN3 (char *

first, the basic composition of the image file The image file loading time domain includes the RO and RW segments, while the runtime domain includes the RO, rw, and Zi three segments. Where the RO and RW segments contentIn load time and run timeis

Programming often requires the value of an expression to be assigned to a variable, which requires that the type of expression be clearly known when declaring a variable. But it's not always easy to do this, and sometimes it's not even possible. To

Assertions and user-supplied messagesthe C + + language supports the three error-handling mechanisms that help you debug your application: #error directives, static_assert keywords, and assert (CRT) macros. All three mechanisms emit error messages,