File Handling in cplus
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  • What you'll learn
    • ✓What is file handling in C++?
    ✓What is the file handling method?
    ✓What is ios file handling in C++?
    ✓What is basic file handling?
    ✓What is file handling command?
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  • File handling allows us to preserve the information/data generated after we run the program. Saves Time: Some programs might require a large amount of input from their users. In such cases, file handling allows you to easily access a part of a code using individual commands.
  • There are two main types of files: text files which contain human-readable text and binary files which contain machine-readable binary data. Common file operations include creating, opening, reading from, writing to, and closing files using functions like fopen(), fread(), fwrite(), and fclose().
  • Functions Description fopen() It is used to create a file or to open a file. fclose() It is used to close a file. fgets() It is used to read a file. fprintf() It is used to write blocks of data into a file.
  • To read the content of a file in C++, we can use the std::ifstream (input file stream) to create the input stream to the file. We can then use the std::getline() function to read the data from this file and store it in into some local string object.
  • Data storage in a file using a program is known as file handling. Programs are written in C using file handling for storing the results and other program data in files. To use the data in the application, we may also extract or fetch it from a file.
  • Modes Description in Opens the file to read(default for ifstream) out Opens the file to write(default for ofstream) binary Opens the file in binary mode app Opens the file and appends all the outputs at the end
  • In C, you open a file using the fopen function, which takes two arguments: the name of the file and the mode you want to use. The mode is usually r to read from a file or w to write to a file. The mode supports other options too, but for this tutorial, just focus on reading and writing.
  • A file may be designed to store an image, a written message, a video, a program, or any wide variety of other kinds of data. Certain files can store multiple data types at once. By using computer programs, a person can open, read, change, save, and close a computer file.
  • File handling is necessary in any language. It helps you to create and write files for permanent storage. For example an application will store all the settings in a file which will be used by the application so you need file support.
  • The write function will the entire area of memory, occupied by obj , to the stream. Any padding between structure or class members will also be written. Values of pointers will be written to the stream, not the item that the pointer points to.

Requirement

File handling is used to store data permanently in a computer. Using file handling we can store our data in secondary memory (Hard disk)

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