fputs in C

fputs() is a standard library function in C programming used for writing a string to a file.

It writes the null-terminated string pointed to str and identifies the specified output file stream.

Features of fputs() in C:

File Output: `fputs()` enables writing entire strings to files and output text data.
Error Handling: The return value of `fputs()` can be used to check for errors during the write operation.

Syntax:

int fputs(const char *str, FILE *stream);

"str": Pointer to the null-terminated string to be written.
"stream": Pointer to a "FILE" object that identifies the output stream.

The "fputs()" function returns a non-negative value on success, or "EOF" (defined in "stdio.h") on failure.

Writing a String to a File:

#include <stdio.h>

int main() {
    FILE *file;
    char str[] = "Hello, world!\n";

    // Open the file in write mode
    file = fopen("output.txt", "w");

    // Check if file opened successfully
    if (file == NULL) {
        perror("Error opening file");
        return 1;
    }

    // Write the string to the file
    if (fputs(str, file) == EOF) {
        perror("Error writing to file");
        fclose(file);
        return 1;
    }

    // Close the file
    fclose(file);

    printf("String written to file successfully.\n");

    return 0;
}

Appending a String to a File:

#include <stdio.h>

int main() {
    FILE *file;
    char str[] = "This line will be appended.\n";

    // Open the file in append mode
    file = fopen("output.txt", "a");

    // Check if file opened successfully
    if (file == NULL) {
        perror("Error opening file");
        return 1;
    }

    // Write the string to the file
    if (fputs(str, file) == EOF) {
        perror("Error writing to file");
        fclose(file);
        return 1;
    }

    // Close the file
    fclose(file);

    printf("String appended to file successfully.\n");

    return 0;
}

Writing Multiple Strings to a File:

#include <stdio.h>

int main() {
    FILE *file;
    char str1[] = "First line\n";
    char str2[] = "Second line\n";
    char str3[] = "Third line\n";

    // Open the file in write mode
    file = fopen("output.txt", "w");

    // Check if file opened successfully
    if (file == NULL) {
        perror("Error opening file");
        return 1;
    }

    // Write the strings to the file
    fputs(str1, file);
    fputs(str2, file);
    fputs(str3, file);

    // Close the file
    fclose(file);

    printf("Strings written to file successfully.\n");

    return 0;
}

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