Programming tutorials (AKSZ)

Monday, 20 February 2017

Windows Activator 7,8.1,10

Friday, 3 July 2015

File handling in Detail

What is file handling? Why we use file handling.

Files permanently.

Before the A file is a collection of related records. A record contains data about an entity. A file can be used to save any type of data. Files are stored on secondary storage. The data is stored in start of using database management system, file handling is used to store data entered through C++ programs.

Normally when we enter data through C++ programs, it is stored in variables. If data is long then it can not be entered again and again. There are certain chances of errors and mistakes while we enter data again and again. When program ends, the data entered through C++ programs will be lost. Because they are stored temporarily in variables.

To store our data permanently on secondary storage devices in a file through C++ programs is called File handling. There are various streams are available to read and write data to and from the files. fstream, Ifstream,Fstream classes are used to input data and read data from files.

Ofstream class is used to write on files.

Ifstream class is used to read from files.

Fstream class is used to both read and write data to and from files.

The file should be opened before it can be accessed. A file pointer is declared and associated with the file to be opened. A file can be opened by first creating an object of ifstream, ofstream, fstream. The object is then associated with the physical file. An open file is represented by a stream object in a program. Any input and output operation performed on this stream object is applied to the physical file associated to it. It helps us to store our data permanently into files and can be read when ever required.