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C programming. Please explain step by step. how do we get [21] as an output #include #include #include main () {  int fd;   /* Open a non-existent file to cause an error */  fd = open ("nonexist.txt", O_RDONLY);  if (fd == -1) /* fd == -1 =, an error occurred */ {   printf ("errno = %d\n", errno);   perror ("main");  }  /* Force a different error */  fd = open ("/", O_WRONLY);  if (fd == -1) {   printf ("errno = %d\n", errno);   perror ("main");  }

C programming. Please explain step by step. how do we get [21] as an output #include #include #include main () {  int fd;   /* Open a non-existent file to cause an error */  fd = open ("nonexist.txt", O_RDONLY);  if (fd == -1) /* fd == -1 =, an error occurred */ {   printf ("errno = %d\n", errno);   perror ("main");  }  /* Force a different error */  fd = open ("/", O_WRONLY);  if (fd == -1) {   printf ("errno = %d\n", errno);   perror ("main");  }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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C programming. Please explain step by step. how do we get [21] as an output

#include <stdio.h>

#include <fcntl.h>

#include <errno.h>

main () {

 int fd;

  /* Open a non-existent file to cause an error */

 fd = open ("nonexist.txt", O_RDONLY);

 if (fd == -1) /* fd == -1 =, an error occurred */ {

  printf ("errno = %d\n", errno);

  perror ("main");

 }

 /* Force a different error */

 fd = open ("/", O_WRONLY);

 if (fd == -1) {

  printf ("errno = %d\n", errno);

  perror ("main");

 }

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