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Find common usage examples in Linux

This article describes Linux find usage examples

Dec 13, 2016 pm 01:49 PM

find command

About void main() in C language

Many people and even some books on the market use void main(), which is actually wrong. void main( ) has never been defined in C/C++. Bjarne Stroustrup, the father of C++, clearly stated in the FAQ on his homepage that The definition void main( ) { /* ... */ } is not and never has been C++, nor has it even been C.( void main ( ) never existed in C++ or C). Next, let me talk about the main function in the C and C++ standards respectively.

Dec 13, 2016 pm 01:26 PM

main void

void and void* in C/C++

The void keyword represents the concept of "empty type". However, the "empty type" here does not mean "any type", but means that it does not exist. That is to say, C/C++ does not allow you to write the statement void a, and there is no thing of type void.

Dec 13, 2016 pm 01:17 PM

Deeply understand the meaning of void and void pointers

This article provides a detailed analysis and introduction to the meaning of void and void pointers. Friends in need can refer to it

Dec 13, 2016 pm 01:15 PM

void

Detailed explanation of void and void*

Rules for using void keyword: 1. If the function has no return value, it should be declared as void type; 2. If the function has no parameters, then its parameters should be declared as void; 3. If the function parameters can be pointers of any type, then Its parameters should be declared as void *; 4. void cannot represent a real variable; void embodies an abstraction, and all variables in this world are "typed"

Dec 13, 2016 pm 01:14 PM

The use and difference between intval() and (int) conversion under PHP

Wondering what the difference is between using intval() and (int) conversion? Or what are the differences between the two, including functions and definitions. Or related to frequency of use, efficiency, etc.

Dec 13, 2016 pm 01:03 PM

Detailed explanation of PHP page encoding declaration method (header or meta)

The difference between PHP page encoding declaration and using header or meta to implement PHP page encoding

Dec 13, 2016 pm 12:00 PM

php coding

linux command: top command

The top command is a commonly used performance analysis tool under Linux. It can display the resource usage of each process in the system in real time, similar to the Windows Task Manager. The following describes how to use it in detail. top is a dynamic display process, that is, the current status can be continuously refreshed through the user's keystrokes. If this command is executed in the foreground, it will occupy the foreground exclusively until the user terminates the program. To be more precise, the top command provides real-time control of the system Processor status monitoring. It will display a list of the most CPU "sensitive" tasks in the system. This command can sort tasks by CPU usage, memory usage and execution time; and many features of this command can be accessed through interactive commands or Make settings in the personal customization file.

Dec 13, 2016 am 11:59 AM

Analyze the implementation principles of session in PHP and issues that should be paid attention to when applying large websites

This article is a detailed analysis and introduction to the implementation principle of session in PHP and the issues that should be paid attention to in large website applications. Friends who need it can refer to it.

Dec 13, 2016 am 11:58 AM

session

rails render partial parameter variable description

Dec 13, 2016 am 11:54 AM

Linux reboot command

The Linux reboot command is used to restart the computer. If the runlevel of the system is 0 or 6, reboot, otherwise use the shutdown command (plus the -r parameter) to replace it.

Dec 13, 2016 am 11:43 AM

Linux command: reboot command

This command is used to restart the Linux system. Equivalent to the restart command in Windows systems.

Dec 13, 2016 am 11:41 AM

reboot command

Linux C Programming - Pipes

In Linux, a pipe is also a kind of file, but it is special. We can use the pipe function to create a pipe, and its prototype is declared as follows:

Dec 13, 2016 am 11:37 AM

Linux pipe function

pipe (create pipe): 1) Header file #include<unistd.h> 2) Define function: int pipe(int filedes[2]); 3) Function description: pipe() will create a pipe and change the file descriptor from The parameter filedes array is returned. filedes[0] is the reading end of the pipe, and filedes[1] is the writing end of the pipe. 4) Return value: If successful, return zero, otherwise return -1, and the cause of the error is stored in errno. Error code: E

Dec 13, 2016 am 11:34 AM