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• Read A Text File In C# Line By Line
• C - File I/O - Tutorialspoint
• Read Text File In C#
• How To Read A Text File In C Programming

Text files in C are straightforward and easy to understand. All text file functions and types in C come from the stdio library. When you need text I/O in a C program, and you need only one source for input information and one sink for output information, you can rely on stdin (standard in) and stdout (standard out). The stdio.h header defines the fgets function. This function reads a line from a stream and stores it in a specified string. The function stops reading text from the stream when either n - 1 characters are read, the newline character (' ') is read or the end of file (EOF) is reached. 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. File Input and Output in C. In order to read information from a file, or to write information to a file, your program must take the following actions. 1) Create a variable to represent the file. 2) Open the file and store this 'file' with the file variable.

Read A Text File In C# Line By Line

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

Compiling the Code

Copy the code and paste it into the Main method of a console application.

Replace 'c:test.txt' with the actual file name.

Robust Programming

The following conditions may cause an exception:

• The file may not exist.

.NET Security

Do not make decisions about the contents of the file based on the name of the file. For example, the file myFile.cs may not be a C# source file.

See also

File I/O in C is very similar to Matlab. There are two main differences. One, we have to type the FILE variable. Two, we read one value (or a single line of values) at a time, whereas by default in Matlab, you may read many values at once.

The basic steps for using a File in C are always the same:

C - File I/O - Tutorialspoint

1. Create a variable of type 'FILE*'.

2. Open the file using the 'fopen' function and assign the 'file' to the variable.

3. Check to make sure the file was successfully opened by checking to see if the variable NULL. If it does, an error has occured.

4. Use the fprintf or fscanf functions to write/read from the file. Usually these function calls are placed in a loop. In the case of reading data, usually, the data is read in and placed in an array, but sometimes we process the data 'on the fly' (i.e., we do not store the data, we process it and create a result directly before reading any more data.

Example Code

Here are examples of the basic syntax for opening a file and writing to or reading from it:

Here is a comparison between reading from a file in Matlab and in C:

Read Text File In C#

Matlab

FGETS function: Read One Line at a Time

To read one line from a file (or the keyboard) at a time, use the fgets function.

fgets places the 'n' (newline) at the end of the line. Thus if we type in 'hello', what really goes into the variable line is [ 'h', 'e', 'l', 'l', 'o', 'n', '0' ]

How To Read A Text File In C Programming

fgets returns the keyword null on error. Thus we often use: