Jun 24, 2024 · In C, the fgets () function is a standard way to read a file line by line. It reads a string from the specified file until a newline character is encountered or the end-of-file is reached. Here, str: Pointer to an array where the read string will be stored. n: Maximum number of characters to be read (including the null character).

Aug 18, 2015 · char *line = readLine(file); printf("LOG: read a line: %s\n", line); if (strchr(line, 'a')) { puts("The line contains an a"); } /* etc. */ free(line); /* After this point, the memory allocated for the line has been reclaimed.

Feb 9, 2012 · To read a line from a file, you should use the fgets function: It reads a string from the specified file up to either a newline character or EOF. The use of sscanf in your code would not work at all, as you use filename as your format string for …

Dec 5, 2015 · Use the following program for getting the line by line from a file. char filename[] = "file.txt"; FILE *file = fopen ( filename, "r" ); if (file != NULL) { char line [1000]; while(fgets(line,sizeof line,file)!= NULL) /* read a line from a file */ { fprintf(stdout,"%s",line); //print the file contents on stdout. fclose(file); else {

Mar 12, 2025 · This article demonstrates how to read a file line by line using fscanf in C. Learn the best practices, error handling techniques, and alternative methods like fgets to read files efficiently. Perfect for beginners and experienced developers alike, this guide will enhance your file handling skills in C programming.

Apr 3, 2019 · In this article, I will show you how to read a text file line by line in C using the standard C function fgets and the POSIX getline function. At the end of the article, I will write a portable implementation of the getline function that can be used with any standard C compiler.

Jun 17, 2024 · In C, we can read files using functions provided by the standard library such as fopen (), fgetc (), fgets (), and fread (). Open a file using the function fopen () and store the reference of the file in a FILE pointer. Read contents of the file using any of these functions fgetc (), fgets (), fscanf (), or fread ().

In C programming file I/O are handled by library function fopen (). This program shows how to read text file line by line and print it on screen.

To read contents of text file line by line in C programming, follow these steps. Open the text file in read mode, using fopen (). If file pointer is null, return 1, else continue. Using fgets (), read next line into a string. fgets () returns string or EOF. You can use while loop to read line by line using fgets () function.

Oct 17, 2021 · The most straightforward way to read a text file line by line in C is the getline function. On my Debian and FreeBSD systems, the prototype can be found in stdio.h and shared object code can be found in libc.so. According to the man page on my Debian system, getline is part of POSIX.1-2008.