Find the longest word in the file

simple.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define ARR_SZ 1024

int main()
{
    FILE *f = fopen("ctext.txt", "r");
    if (f == NULL) {
        fprintf(stderr, "error opening the file\n");
        return 1;
    }

    char longest_word[ARR_SZ];  // Assuming there is no word longer than 1024.
    int longest_sz = 0;

    char temp_word[ARR_SZ];
    int temp_i = 0;

    int ch;
    for (;;) {
        ch = fgetc(f);
        if (ch == EOF) {
            break;
        }

        if (temp_i >= ARR_SZ - 1) {
            fprintf(
                stderr,
                "oops, words are too long, make the arrays larger\n");
            return 1;
        }

        if (ch == ' ' || ch == '\t' || ch == '\n') {
            if (temp_i > longest_sz) {
                longest_sz = temp_i;
                temp_word[temp_i] = '\0';
                strcpy(longest_word, temp_word);
                printf("found a new longest word: %s\n", temp_word);
            }

            temp_i = 0;
            continue;
        }

        temp_word[temp_i++] = (char)ch;
    }

    printf("longest word: %s\n", longest_word);
    printf("longest word size: %i\n", longest_sz);
    return 0;
}