Programming

#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
// questions 1 & 2:
// access validates access to a file  F_OK == path is okay and file exists  
//  R_OK == F_OK + I can read it, so use R_OK
// Q3:
// this is a general function to get the size of an opened file
size_t filesize(int fd)
{
    struct stat st;
    if(fstat(fd, &st)== -1)
    {
          perror("Cannot stat file");
          exit(1);
    }
    return st.st_size;
}
int main(int argc, char **argv)
{
    FILE *in=NULL; 
    
    if(access(argv[1], R_OK)==0)
    {
           printf("file %s, access is okay\n", argv[1]);
    }
    in=fopen(argv[1],"r");
    printf("file size = %u\n", filesize(fileno(in));
    fclose(in);
    return 0;
}

   printf("file size = %u\n", filesize(fileno(in));

   printf("file size = %u\n", filesize(fileno(in)) );

int fd = open( pathToFile, O_RDONLY );

int u=1;
char line[11];
    int length;
FILE *fr;
fr = fopen ("/usr/share/dict/words", "r");
while (fgets(line, 11, fr) != NULL) {
 length = str_len(&line);
 printf(line);
 printf("\n%d %d\n",length,u);
u++;
}