C编程ftell fseek fread,读取文件大小

#include<stdio.h>
long int ftell(FILE *stream);

#include<stdio.h>
int fseek(FILE *stream, long int offset, int origin);

#include<stdio.h>
size_t fread(void *buffer, size_t size, size_t count, FILE *stream);

#include<stdio.h>

int main() {
    FILE *file = fopen("example.txt", "rb");
    if (file == NULL) {
        printf("Error opening file\n");
        return 1;
    }

    // Move file pointer to the end of the file
    fseek(file, 0, SEEK_END);

    // Get the file size
    long fileSize = ftell(file);

    // Move file pointer back to the beginning of the file
    fseek(file, 0, SEEK_SET);

    printf("File size: %ld bytes\n", fileSize);

    fclose(file);
    return 0;
}