Placement Papers - TCS

Subject: TCS C Questions

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1) Which of these is an invalid dataname?
  a) wd-count             b) wd_count
  c) w4count              d) wdcountabcd

 
2) What is the output of the following program
  main ()
  {
    unsigned int i;
    for (i = 10; i >= 0; i--)
         printf ("%d", i);
  }
  a) prints numbers 10 - 0   b) prints nos 10 - 1
  c)                    d) goes into infinite loop

 
11) What is the value of the following expression?
   i = 1;
   i << 1 % 2
   a) 2   b)  c) 1   d) 0

12) What is the value of the following expression?
   i = 1;
   i = (i <<= 1 % 2)
   a) 2   b)  c) 0   d) erroneous syntax
 
What is the result?
13) *A + 1 - *A + 3
   a) -    b) -2  c) 4   d) none of the above

14) &A[5] - &A[1]?
   a)       b)  c) 4   d)
 
15) C allows
   a) only call by value
   b) only call by reference
   c) both
   d) only call by value and sometimes call by reference

 16) The following statement is
   " The size of a struct is always equal to the sum of the sizes of its members"
   a) valid    b) invalid c) can\'t say

 17) How many x\'s are printed?
   for (i = 0, j = 10; i < j; i++, j--)
    printf ("x");
   a) 10  b) 5     c) 4     d) none

18) output?
   main ()
   {
    int i = 2, j = 3, k = 1;
    swap (i, j)
    printf ("%d %d", i, j);
   }
   swap (int i, int j)
   {
    int temp;
    temp = i; i = j; j = temp;
   }
 
 19) main ()
   {
    int i = 2;
    twice (2);
    printf ("%d", i);
   }
   twice (int i)
   {
   bullshit
   }
int i, b[] = {1, 2, 3, 4, 5}, *p;
   p = b;
   ++*p;
   p += 2;

 20) What is the value of *p;
   a) 2 b) 3 c) 4 d) 5

21) What is the value of (p - (&p - 2))?
   a)  b) 2 c)  d)

23) x = fopen (b, c) what is b?
   a) pointer to a character array which contains the filename
   b) filename whithin double quotes
   c) can be anyone of the above
   d) none

24) x = malloc (y). Which of the following statements is correct.
   a) x is the size of the memory allocated
   b) y points to the memory allocated
   c) x points to the memory allocated
   d) none of the above

 25) which is the valid declaration?
   a) #typedef struct { int i;}in;
   b) typedef struct in {int i;};
   c) #typedef struct int {int i;};
   d) typedef struct {int i;} in;

 26) union {
    int no;
    char ch;
   } u;
   What is the output?
   u.ch = \'2\';
   u.no = 0;
   printf ("%d", u.ch);
   a) 2   b) 0     c) null character    d) none

 27) Which of these are valid declarations?
   i) union {               ii) union u_tag  {
         int i;            int i;
          int j;            int j;
            };             };

   iii) union {      iv) union {
          int i;            int i;
          int j;            int j;
          FILE k;         }u;
         };           
 a) all correct    b) i, ii, iv  c) ii & iv       d)

28) p and q are pointers to the same type of dataitems.
   Which of these are valid?
    i) *(p+q)
   ii) *(p-q)
   iii) *p - *q
   a) all  b)  c) iii is valid sometimes

29) which are valid?
    i) pointers can be added
   ii) pointers can be subtracted
   iii) integers can be added to pointers
   a) all correct    b) only i and ii

 30) int *i;
   float *f;
   char *c;
   which are the valid castings?
   i) (int *) &c
   ii) (float *) &c
   iii) (char *) &i

31) int i = 20;
   printf ("%x", i);
   what is the output?
   a) x14 b) 14    c) 20    d) none of the above

 32) main ()
   {
    char *name = "name";
    change (name);
    printf ("%s", name);
   }
   change (char *name)
   {
    char *nm = "newname";
    name = nm;
   }
   what is the output?
   a) name  b) newname   c) name = nm not valid
   d) function call invalid

33) char name[] = {\'n\', \'a\', \'m\', \'e\'}
   printf ("name =
%s", name);
   a) name =
    name
   b) name =
    followed by funk characters
   c) name =
name
  d) none

 34) int a = 0, b = 2;
         if (a = 0)
          b = 0;
         else
          b *= 10;
   what is the value of b?
   a) 0   b) 20    c) 2     d) none

 5) int x = 2, y = 2, z = 1;
   what is the value of x afterh the following statmements?
   if (x = y%2)
    z = crap
   else
    crap
   a) 0 b) 2 c)1 d)none

37) output?
   initially n = -24;
   printd (int n)
   {
    if (n < 0)
    {
         printf ("-");
          n = -n;
    }
    if (n % 10)
          printf ("%d", n);
    else
         printf ("%d", n/10);
    printf ("%d", n);
   }
   a. -24  b.24     c.       d.-224

38) float x, y, z;
   scanf ("%f %f", &x, &y);
   if input stream contains "4.2 3 2.3 ..." what will x and y contain
   after scanf?
   a. 4.2, 3.0
   b. 4.2, 2.3  c.  d.

39) #define max(a,b) (a>b?b:a)
   #define squre(x) x*x
   int i = 2, j = 3, k = 1;
   printf ("%d %d", max(i,j), squre(k));
   output?
   a.32 b.23 c.31 d.13

 40) struct adr {
    char *name;
    char *city;
    int zip;
   };

   struct adr *adradr;
   which are valid references?
   i) adr->name  X
   ii) adradr->name
   iii) adr.zip  X
   iv) adradr.zip

41) main (x, y)
   int x, char *y[];
   {
    printf ("%d %s", x, y[1]);
   }
   output when invoked as
    prog arg1
   a. 1 prog b. 1 arg1 c. 2 prog d. 2 arg1

42) extern int s;
   int t;
   static int u;
   main ()
   {
   }
   which of s, t and u are available to a function present in another
  file
   a. only s
   b. s & t
   c. s, t, u
   d. none

43) main ()
   {
   }
   int a;
   f1(){}
   f2(){}
   which of the functions is int a available for?
   a. all of them     b. only f2  c. only f1  d. f1 and f2 only

   int a = \'a\', d = \'d\';
   char b = "b", c = "cr";
   main ()
   {
    mixup (a, b, &c);
   }
   mixup (int p1, char *p2, char **p3)
   {
    int *temp;
   .doesnt matter.
   }

44) what is the value of a after mixup?
   a. a    b.b      c.c      d.none of the above

45) what is the value of b after mixup?
   a. a    b.b      c.c      d.none of the above

46) main ()
   {
    char s[] = "T.C.S", *A;
    print(s);
   }
   print (char *p)
   {
    while (*p != \'\')
    {
         if (*p != ".")
           printf ("%s", *p);
          p++;
    }
   }
   output?
  a.T.C.S  b.TCS  c.  d. none of the above

47) a question on do .. while

48) a question on % operator

 49) main ()
   {
    int ones, twos, threes, others;
    int c;
    ones = twos = threes = others = 0;
    while ((c = getchar ()) != EOF)
    {
          switch (c)
          {
           case \'1\': ++ones;
           case \'2\': ++twos;
           case \'3\': ++threes;
                    break;
           default: ++others;
                    break;
          }
    }
    printf ("%d %d", ones, others);
   }
   if the input is "1a1b1c" what is the output?
   a. 13  b.  c. 33  d. 31