将文件中的每一个单词都转换为大写的C

#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>

void convertToUpper(FILE *file) {
    int ch;
    bool newWord = true;

    while ((ch = fgetc(file)) != EOF) {
        if (isspace(ch)) {
            newWord = true;
            fputc(ch, stdout);
        } else {
            if (newWord) {
                fputc(toupper(ch), stdout);
                newWord = false;
            } else {
                fputc(ch, stdout);
            }
        }
    }
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    FILE *file = fopen(argv[1], "r");
    if (file == NULL) {
        perror("Error opening file");
        return 1;
    }

    convertToUpper(file);

    fclose(file);
    return 0;
}