Summary of the interview process (I). Summary of the interview process

Summary of the interview process (I). Summary of the interview process

Since I started my job in the previous job, I have been visiting the blog park in my spare time. Many articles in the blog garden play a very important role in my daily work.

I used to want to write something, but I never knew what to write. I just resigned some time ago and recorded some of the questions I encountered during the interview. I thought it was a basic review.

 

Use the file operation function in the c standard, and output all the data to the terminal in a hexadecimal format after reading the data (this is the question of the written examination in the interview today ), I wrote the following based on my own understanding. If it is inappropriate, I would like to criticize and correct it.

　　

1 # include <stdio. h> 2 # include <stdlib. h> 3 # include <string. h> 4 5 // use the file operation function in the c standard. After reading all the functions, output them to the terminal 6 7 int main (int argc, char * argv []) in hexadecimal format. 8 {9 FILE * fp = fopen ("sizeofSTRUCT. cpp "," r "); 10 if (NULL = fp) 11 {12 printf (" % s \ n "," fopen () ERROR !!! "); 13 return-1; 14} 15 16 long curPos, longth; 17 // get the initial position of the file pointer 18 curPos = ftell (fp ); 19 20 // obtain the file size so that the memory is applied for later. // After fseek (), the file pointer will be at the specified position. After this execution, the file pointer will be at the end of 22 fseek (fp, 0, SEEK_END); 23 longth = ftell (fp); 24 25 // place the file pointer at the beginning of the file for subsequent reading of the file content 26 fseek (fp, 0, SEEK_SET ); 27 28 char * buff = (char *) malloc (longth + 1); 29 memset (buff, 0, longth + 1 ); 30 31 // output file content in string format 32 fread (buff, longth, 1, fp); 33 printf ("% s \ n", buff ); 34 35 // output 36 int I = 0 in hexadecimal format; 37 for (; I <longth + 1; ++ I) 38 printf ("% x ", (buff + I); 39 40 printf ("\ n"); 41 42 free (buff); 43 buff = NULL; 44 45 return 0; 46}