C programming read data file

Opens a text file for writing. If it does not exist, then a new file is created. Here your program will start writing content from the beginning of the file. Opens a text file for writing in appending mode. Here your program will start appending content in the existing file content. Opens a text file for both reading and writing.

It first truncates the file to zero length if it exists, otherwise creates a file if it does not exist. It creates the file if it does not exist. The reading will start from the beginning but writing can only be appended. The fclose - function returns zero on success, or EOF if there is an error in closing the file. That is cool! But what's more interesting is to open the file through your program. Let's write a C program to open a file from a hard disk whose name is entered by a user and to display its contents on the screen.

The file must be present in the directory in which the executable file of the program exists. Function fopen is used to open a file; it returns a pointer to structure FILE, which is a predefined structure in the "stdio.

Save my name, email, and website in this browser for the next time I comment. What do you want to Learn Today? Open the file. Read the file. Write the file. Close the file. Reading Files in C Program Before reading the file using programming, just create a text file in the current directory and add some text in a file using simple notepad. Follow the steps to read the file: Create a file pointer. Popular Tutorials Data Types in C. C for Loop. Arrays in C Programming. Pointers in C.

Find roots of a quadratic equation. Print Pyramids and Patterns. Check prime number. Print the Fibonacci series. Reference Materials string. Start Learning C. Explore C Examples. Related Topics Write a Sentence to a File.

Read the First Line From a File. C clearerr. Display its own Source Code as Output. C "Hello, World! C File Handling In this tutorial, you will learn about file handling in C. A file is a container in computer storage devices used for storing data. Why files are needed? When a program is terminated, the entire data is lost.

Storing in a file will preserve your data even if the program terminates.