While writing code we need various variables. Each variable has its own boundaries where they are accessible. Variables does not hold their values outside their boundaries. These boundaries are known [ … ]
Variables of C++
A variable is the name of a memory location. It is used to allocate memory to store the given data. Its values can be changed and it can be reused [ … ]
Escape Sequence
The list of backslash character constant or escape sequence is as in the below table:Constant Meaning‘\a’ or “\a” Audible bell(Beep)‘\b’ or “\b” Backspace (it moves [ … ]
Too many connections error
If clients face Too many connections errors when attempting to connect to the mysql server, all available connections are in use by others.The number of connections which we have configured [ … ]
umount: /HdD: target is busy.
[root@webnoid hdd]# df -kh Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 155G 132G 24G 86% / devtmpfs 2.8G 0 2.8G 0% /dev tmpfs 2.8G 8.0K 2.8G 1% /dev/shm tmpfs [ … ]
Constants
Constants refer to fixed values that the program may not alter. Constants can be of any of the basic data type. The way each constant is represented depends upon its [ … ]
Identifiers
A C++ identifier is a name used to identify a variable, function, class, module, or any other user-defined item. An identifier starts with the letters A to Z or a [ … ]
Keywords
The Keyword is a predefined or reserved word in the C++ library with a fixed meaning and is used to perform an internal operation. C++ language supports more than 64 [ … ]
Tokens of C++
The smallest individual units in a program are called as tokens.C++ has the following tokens. Keywords Identifiers Constants String Operators
C++ Input and Output Functions
C++ Input/Output operations is used the stream concept. Stream is the sequence of bytes or flow of data. It makes the performance fast. If data flow from main memory to [ … ]