FPUTC()

this function is used to write a single character to a file or output stream.

int fputc(int character, FILE *stream);

 * character: The character to write (as an int, typically a char)
 * stream: Pointer to a FILE object (e.g., stdout, a file pointer from fopen())
 * Writes the character to the given output stream.
 * Returns the character written (as unsigned char cast to int) on success.
 * Returns EOF on failure.

#include <stdio.h>

int main() {
    FILE *fp = fopen("example.txt", "w");
    if (fp == NULL) {
        perror("File opening failed");
        return 1;
    }

    fputc('H', fp);
    fputc('i', fp);
    fputc('\n', fp);

    fclose(fp);
    return 0;
}

 * COMMON USE CASE
   char *text = "Hello, world!";
   for (int i = 0; text[i] != '\0'; i++) {
     fputc(text[i], stdout);  // prints to console one character at a time
   }