1. Read From Text File In C#
2. Read Text File In C Sharp
3. Read Text File In C# Using Filestream
4. Cached

To read contents of text file character by character 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 fgetc function, read next character from text file into a string. Fgetc returns character read from 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. File. fpReadFile; To read any file, you have to open the text file using file pointer.

How to read a file in C? You already know what a file is and their types (text/binary (audio/images/video etc.)). When a computer is off, they are present on the hard disk.

Read From Text File In C#

Reading a file line by line is a trivial problem in many programming languages, but not in C. The standard way of reading a line of text in C is to use the fgets function, which is fine if you know in advance how long a line of text could be. You can find all the code examples and the input file at the GitHub repo for this article. This example reads the contents of a text file, one line at a time, into a string using the ReadLine method of the StreamReader class. Each text line is stored into the string line and displayed on the screen. Example int counter = 0; string line; // Read the file and display it line by line.

Suppose you made a C program last week to sort numbers, and you wish to see the program again. How do you do it? You locate the file on the system and open it in an IDE/text editor. That is cool! But what's more interesting is to open the file through your program.

For simplicity, we discuss reading text files only.

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. Opening a file means we bring the file contents from disk to RAM to perform operations (read/modify/append a file) on it. 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.h' header file. If the file opening is successful, then it returns a pointer to the file, and if it's unable to open it, then it returns NULL.

Function fgetc returns a character read from the file, and the fclose function closes the file.

Read file in C using fopen

C programming code to open a file and print its contents on screen.

int main()
{
char ch, file_name[25];
FILE *fp;

printf('Enter name of a file you wish to seen');
gets(file_name);

fp =fopen(file_name,'r');// read mode

if(fp NULL)
{
perror('Error while opening the file.n');
exit(EXIT_FAILURE);
}

printf('The contents of %s file are:n', file_name);

while((ch =fgetc(fp))!= EOF)
printf('%c', ch);

fclose(fp);
return0;
}

Read file C program output:

Read Text File In C Sharp

Download Read file program.

Read Text File In C# Using Filestream

There are blank lines present at the end of the file. In our program, we have opened only one file. You can open multiple files in a single program, in different modes as required.

Cached

File handling is essential when we wish to store data permanently on a storage device. All variables and data of a program are lost when it terminates. If the data is required later, we need to store it in a file.