C program reads a line from the file and displays it

Comprehensive Collection of C Programming Examples

In this example, you will learn to read text from a file and store it in a string until a newline character '\n' is encountered.

To understand this example, you should be familiar with the followingC language programmingTopic:

• C file processing

• C language string

The program reads text from the file

#include <stdio.h>
#include <stdlib.h>　//　For exit() function
int main() {
　　　　char c[1000];
　　　　FILE　*fptr;
　　　　if ((fptr = fopen("program.txt", "r")) == NULL) {
　　　　　　　　printf("Error! opening file");
　　　　　　　　//If the file pointer returns NULL, the program exits.
　　　　　　　　exit(1);
　　　　}
　　　　//　Read the text until a newline character is encountered
　　　　fscanf(fptr, "%[^\n]", c);
　　　　printf("Data from the file:\n%s", c);
　　　　fclose(fptr);
　　　　return 0;
}

If the file is found, the program saves the file content as a string c until a newline character '\n' is encountered.

Assuming the program.txt file is in the current directory and contains the following text.

C programming is awesome.
I love C programming.
How are you doing?

The output of this program will be:

Data from the file:
C programming is awesome.

If program.txt cannot find the file, the program will display an error message.

Comprehensive Collection of C Programming Examples