c语言显示文件自身

1、

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

int main(void)
{
    int n;
    unsigned long count = 0;
    unsigned char buf[16];
    FILE *fp;
    char fname[FILENAME_MAX];
    
    printf("file name: "); scanf("%s", fname);
    
    if((fp = fopen(fname, "rb")) == NULL)
        printf("aFile open failed.
");
    else
    {
        while((n = fread(buf, 1, 16, fp)) > 0)
        {
            int i;
            printf("%081X ", count);
            
            for(i = 0; i < n; i++)
                printf("%02x ", (unsigned)buf[i]);
            
            if(n < 16)
                for(i = n; i < 16; i++)
                    printf(" ");
            
            for(i = 0; i < n; i++)
                putchar(isprint(buf[i]) ? buf[i] : '.');
                
            putchar('
');
            count += 16;    
        }    
        fclose(fp);
    }
    return 0;
}