ouverture du fichier c

#include <stdio.h>

int main() {
    FILE *filePointer;
    char data[50];

    filePointer = fopen("file.txt", "r");

    if (filePointer == NULL) {
        printf("File cannot be opened.\n");
        return 1;
    }

    fscanf(filePointer, "%s", data);
    printf("Data from the file: %s\n", data);

    fclose(filePointer);

    return 0;
}

Explanation:

• #include <stdio.h>: Includes the standard input-output header file for handling input and output operations.
• int main() { ... }: Entry point of the program.
• FILE *filePointer;: Declares a pointer to a FILE type, used for file operations.
• char data[50];: Declares an array data capable of holding 50 characters.
• filePointer = fopen("file.txt", "r");: Opens a file named "file.txt" in read mode. fopen returns a pointer to the file.
• if (filePointer == NULL) { ... }: Checks if the file opening was unsuccessful. If filePointer is NULL, it means the file couldn't be opened.
• printf("File cannot be opened.\n");: Displays an error message if the file opening fails.
• fscanf(filePointer, "%s", data);: Reads a string from the file pointed to by filePointer and stores it in the data variable.
• printf("Data from the file: %s\n", data);: Prints the data read from the file.
• fclose(filePointer);: Closes the file associated with filePointer to release resources.
• return 0;: Indicates successful execution of the program.