Quiz #1

Instructions: Answer each question. If the question asks you for output from a program, you must give the output character-for-character, including exactly the right number of blanks, except for the new-line, which you must omit.

Question 1   Fill in the Blank (1 points)
  Question: What is the output of the following program? 
#include <stdio.h>
int main (int argc, char const *argv[]) {
  int i, j =3;
  for (i = 0; i < 10; i+=2); j = j + 1;
  fprintf (stdout, "i = %3d, j = %3d.\n", i, j);
  return 0;
}
 		 
     

Question 2   Fill in the Blank (1 points)
  Question: What is the output of the following program, assuming it is compiled to produce an executable file named "a.out" and executed by the shell command "./a.out Hello"? 
#include <stdio.h>
#include <ctype.h>
int main (int argc, char const *argv[]) {
  char buf[10];
  char const *p;
  p = argv[0];
  for (p = argv[0]; *p; p++) {
    buf [p - argv[0]] = toupper (*p);
  }
  buf[p - argv[0]] = '\0';
  fprintf (stdout, "buf = \"%s\".\n", buf);
  return 0;
}
 		 
     

Question 3   Multiple Choice (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>

char *p;



int main (int argc, char const *argv[]) {

  strcpy (p, "Hello there!\n");

  fprintf (stderr, "%s", p);

  return 0;

}


 		 
    Hello there!
Hello there!\n
"Hello there!\n"
%s
"%s"
Segmentation fault (core dumped)
the program has syntax error(s)
 

Question 4   Fill in the Blank (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>



int equal (int x, int y) {

  if (x = y) return 1;

  return 0;

}



int main (int argc, char const *argv[]) {

  fprintf (stderr, "%1d", equal (3, 4));

  return 0;

}

 		 
     

Question 5   Fill in the Blank (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>



int x[] = {3, 4, 5, 6, 0, 7};



int main (int argc, char const *argv[]) {

  char *p = (char *) x;

  p += sizeof (int);

  *(int*) p = 8;

  for (p = (char *) x; *p; p+= sizeof (int)) printf ("%2d", *(int *) p);

  return 0;

}

 		 
     

Question 6   Fill in the Blank (1 points)
  Question: What is the output of the following program? 
#include <stdio.h>



#define xx aa

#define aa bb

#ifdef aa

#define bb(x) "hello" x

#else

#define aa(x) "goodbye" x

#endif



int main () {

   printf (aa(" again"));

   return 0;

}

 		 
     

Question 7   Fill in the Blank (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>

int main () {

   int n = 0xffffff;

   printf ("%10x", (n % (n << 16)) >> 4);

   return 0;

}


 		 
     

Question 8   Fill in the Blank (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>



int main () {

  int n = 2;

  switch (n) {

  case 1:

  case 2:

    printf ("first;");

  case 3:

  case 4:

    printf ("second;");

  }

  return 0;

}

 		 
     

Question 9   Fill in the Blank (1 points)
  Question: What is the output of the following program? 

#include <stdio.h>

int main () {

  int n;

  int m;

  n = 1 + 2 + 8;  m = 4 + 8 + 16;

  printf ("%2d %2d %2d %2d", n && m, n || m, n & m, n | m);

  return 0;

}



 		 
     

Question 10   Ordering (1 points)
  Question: Give the names of the Unix shell commands to perform the following operations:


  • copy a file

  • remove a file from a directory

  • rename a file

  • change working directory

  • compile a program

  • change access permissions on a file





 		 
   
 
 
  rm
  cd
  cp
  mv
  chmod
  gcc