When a program runs, the data is in the memory but when it ends or the computer shuts down, it gets lost. To keep data permanently, we need to write it in a file.

File is used to store data. In this topic, you will learn about reading data from a file and writing data to the file.

fstream is another C++ standard library like iostream and is used to read and write on files.

These are the data types used for file handling from the fstream library:

Data type	Description
ofstream	It is used to create files and write on files.
ifstream	It is used to read from files.
fstream	It can perform the function of both ofstream and ifstream which means it can create files, write on files, and read from files.

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Opening a file

To add a generic C class to a project: In Class View, right-click the project to which you want to add the new class, choose Add, and then choose Class. In the Add Class dialog box, in the templates pane, select C Class. Select Add to display the generic C class wizard.

We need to tell the computer the purpose of opening our file. For e.g.- to write on the file, to read from the file, etc. These are the different modes in which we can open a file.

Developer documentation for all DevExpress products. The above resources are automatically added to the Web.config file on adding a DevExpress web control to a new application created using the DevExpress template. To integrate DevExpress ASP.NET MVC extensions into an existing project using the Insert Extension Wizard, perform the.
Jun 09, 2019 By using Visual C.NET 2003 or Visual C 2005, you can add a reference by means of the Add Reference dialog box. To add a project reference, follow these steps: In Solution Explorer, select the project. On the Project menu, click Add References. Note In Visual C 2005, click References on the Project menu, and then click Add New Reference.
Jul 16, 2009 Bloodshed Dev-C is a free C compiler and development environment for Windows operating systems. Like most C compilers, it also can be used to compile ANSI C. By installing the GLUT header and library files, it can be used to write programs that use OpenGL.
Run the setup program and choose Custom installation and then choose the C component. To add C support to an existing Visual Studio 2015 installation, click on the Windows Start button and type Add Remove Programs. Open the program from the results list and then find your Visual Studio 2015 installation in the list of installed programs.

Mode	Description
ios::app	opens a text file for appending. (appending means to add text at the end).
ios::ate	opens a file for output and move the read/write control to the end of the file.
ios::in	opens a text file for reading.
ios::out	opens a text file for writing.
ios::trunc	truncates the content before opening a file, if file exists.

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Let's look at the syntax of opening a file.

We have opened the file 'example.txt' to write on it. 'example.txt' file must be created in your working directory. We can also open the file for both reading and writing purposes. Let's see how to do this:

Closing a file

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C++ automatically close and release all the allocated memory. But a programmer should always close all the opened files. Let's see how to close it.

Reading and writing on a file

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We use << and >> to write and read from a file respectively. Let's see an example.

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