Simple file program in c language

Since we're only inserting one instance of num , the third parameter is 1. Function fread also take 4 arguments similar to the fwrite function as above. In this program, you read the same file program. If you have many records inside a file and need to access a record at a specific position, you need to loop through all the records before it to get the record. This will waste a lot of memory and operation time. An easier way to get to the required data can be achieved using fseek.

The first parameter stream is the pointer to the file. The second parameter is the position of the record to be found, and the third parameter specifies the location where the offset starts. This program will start reading the records from the file program. Course Index Explore Programiz. 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. Start Learning C. Explore C Examples. Related Topics Write a Sentence to a File.

Read the First Line From a File. Store Information of a Student Using Structure. Store Information of Students Using Structure. Store Data in Structures Dynamically. To understand all programs on this page, you should have the knowledge of the following topics. Previous Tutorial:. Next Tutorial:. Share on:. Did you find this article helpful? They contain the source code that we write. Any C language program must contain at least one source file. An exception to this rule is when our application will be compiled as a library and not as an executable application.

Any computer program must have a starting point. Think of the programs that you use. For example, the first thing a web browser does is to open a window. Then it can display a blank page, your start page or something else, but it always starts from a fixed point — the new window. You can see it in different prototypes, like.

C is case sensitive, so if you name your function MAIN, the compiler will not recognize it as the starting point for the program. Functions always have a body, which is located after the function prototype. To explain how a C language program executes I will use the example from the last lesson.

It contained only one source file. It looks like this:. This file will start the execution of our program, because it contains the main function. The code is executed line by line.

This command is a preprocessor directive. Preprocessor directives are instructions to the C preprocessor. These commands are executed before the compilation.