Program to read the first line from a 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! File cannot be opened.");
// Program exits if the file pointer returns NULL.
exit(1);
}
// reads text until newline 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 content of the file to a string c until '\n' newline is encountered.
Suppose the program.txt file contains the following text in the current directory.
C programming is awesome. I love C programming. How are you doing?
The output of the program will be:
Data from the file: C programming is awesome.
If the file program.txt is not found, the program prints the error message.