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Definition of C++ buffer

Buffer is a basic term that denotes a computer memory block that acts as a temporary placeholder. Buffer term is used in almost all fields like video streaming, RAM, etc. In the programming part, a software buffer is a place where data can be kept before it starts processing. It is done in order to make the process faster. That is, normally if data write using direct operation, it takes time. In the case of buffer, it is performed in a fast manner. In this article, we will discuss the C++ buffer in detail.

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Syntax:

In a normal scenario, a buffer gets created when a file is opened and buffer gets flushed when the file is closed. In C++ buffer can be created by the allocation of memory as shown below.

Char* buff = new char [ ]

Similarly, when the memory allocated has to be freed, the following format can be used.

delete[ ] How buffer works in C++?

As I have already mentioned, writing data to buffer is easier than writing data in direct operation. This is the main reason why buffer is used in computer programming. Normally, C++ and other programming languages involve a plethora of calculation operations. In that situation, buffer will be helpful.

In several situations, you may have to flush the unwanted buffer in order to get the next input in the preferred container. That is, not in the previous variable buffer. Let us consider a situation where after encountering the statement “cin”, the user has to input a string or character array. At that time, he or she has to clear the input buffer. Otherwise, the input that is given will be placed in the previous variable’s buffer which is not the preferred container. After the first input, while pressing “Enter” which is available on the output screen, the program skips the next input of the container as the previous variable’s buffer is not cleared.

Note: Suppose the system we are using has low memory. At that time, the buffering benefits became less. That is, we have to identify a balance between buffer size and the existing memory of our computer.

Examples of C++ buffer

Let us see some sample programs on buffer in C++ for a better understanding.

Example #1

Code:

using namespace std; int main() { int num; char c[20]; cin.getline(c,20); cout << num << endl; cout << c << endl; return 0; }

Example #2

Code:

using namespace std; int main() { int num; char c[20]; cin.getline(c,20); cout << num << endl; cout << c << endl; return 0; }

Output:

is used. On executing the code, the user has to input an integer variable and character variable. Unlike the above program, on pressing enter after giving the first input, an additional chance of giving the next input will be given. This shows that the input buffer is cleared. After giving two inputs, both the values given by the user will be printed as shown in the sample output.

Example #3

Code:

using namespace std; int main() { int num; char c[20]; cin.getline(c,20); cout << num << endl; cout << c << endl; return 0; }

Output: