VITTHAL - C - Iterations, Operators

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Decision-making, Bit-wise operations, Branching and Looping

[Q001] What will be the output of the following program :
int main()
{
   printf("Hi!");
   if (-1)
      printf("Bye");
   return(0);
}

(a)No Output
(b)Hi!
(c)Bye
(d)Hi!Bye

[Q002] What will be the output of the following program :
int main()
{
   printf("Hi!");
   if (0 || -1)
      printf("Bye");
   return(0);
}

(a)No Output
(b)Hi!
(c)Bye
(d)Hi!Bye

[Q003] What will be the output of the following program :

int main()
{
   printf("Hi!");
   if (!1)
      printf("Bye");
   return(0);
}

(a)Compile-Time error
(b)Hi!
(c)Bye
(d)Hi!Bye

[Q004] What will be the output of the following program :
int main()
{
   printf("Hi!");
   if !(0)
      printf("Bye");
   return(0);
}

(a)Compile-Time error
(b)Hi!
(c)Bye
(d)Hi!Bye

[Q005] What will be the output of the following program :

int main()
{
   printf("Hi!");
   if (-1+1+1+1-1-1-1+(-1)-(-1))
      printf("Bye");
   return(0);
}

(a)No Output
(b)Hi!
(c)Bye
(d)Hi!Bye

  [Q006] What will be the output of the following program :
  int main()
{
   if (sizeof(int) && sizeof(float) && sizeof(float)/2-sizeof(int))
      printf("Testing");
   printf("OK");
   return(0);
}

(a)No Output
(b)OK
(c)Testing
(d)TestingOK

[Q007] What will be the output of the following program :

int main()
{
   int a=1,b=2,c=3,d=4,e;
   if (e=(a & b | c ^ d))
      printf("%d",e);
   return(0);
}

  (a)0
(b)7
(c)3
(d)No Output

[Q008] What will be the output of the following program :
int main()
{
   unsigned val=0xffff;
   if (~val)
      printf("%d",val);
   printf("%d",~val);
   return(0);
}

(a)Compile-Time error
(b)-1
(c)0
(d)-1 0

[Q009] What will be the output of the following program :

  int main()
{
   unsigned a=0xe75f,b=0x0EF4,c;
   c=(a|b);
   if ((c > a) && (c > b))
      printf("%x",c);
   return(0);
}

(a)No Output
(b)0xe75f
(c)0xefff
(d)None of these

[Q010] What will be the output of the following program :

int main()
{
   unsigned val=0xabcd;
   if (val>>16 | val<<16)
   {
      printf("Success");
      return;
   }
   printf("Failure");
   return(0);
}

(a)No Output
(b)Success
(c)Failure
(d)SuccessFailure

[Q011] What will be the output of the following program :

  int main()
{
   unsigned x=0xf880,y=5,z;
   z=x<<y;
   printf("%#x %#x",z,x>>y-1);
   return(0);
}

(a)1000 f87
(b)8800 0xf88
(c)1000 f88
(d)0x1000 0xf88

[Q012] What will be the output of the following program :
    int main()
{
   register int a=5;
   int *b=&a;
   printf("%d %d",a,*b);
   return(0);
}

(a)Compile-Time error
(b)Run-Time error
(c)5 5
(d)Unpredictable

[Q013] What will be the output of the following program :
auto int a=5;
int main()
{
   printf("%d",a);
   return(0);
}

(a)Compile-Time error
(b)Run-Time error
(c)5
(d)Unpredictable

[Q014] What will be the output of the following program :
int main()
{
   auto int a=5;
   printf("%d",a);
   return(0);
}

(a)Compile-Time error
(b)Run-Time error
(c)5
(d)Unpredictable

[Q015] What will be the output of the following program :

int main()
{
   int a=1,b=2,c=3,d=4;
   if (d > c)
      if (c > b)
         printf("%d %d",d,c);
      else if (c > a)
         printf("%d %d",c,d);
   if (c > a)
      if (b < a)
         printf("%d %d",c,a);
      else if (b < c)
         printf("%d %d",b,c);
   return(0);
}

(a)4 3 3 4
(b)4 3 3 2
(c)4 32 3
(d)4 33 1

[Q016] What will be the output of the following program :
int main()
{
   int a=1,b=2,c=3,d=4;
   if (d > c)
      if (c > b)
         printf("%d %d",d,c);
      if (c > a)
         printf("%d %d",c,d);
   if (c > a)
      if (b < a)
         printf("%d %d",c,a);
      if (b < c)
         printf("%d %d",b,c);
   return(0);
}

(a)4 32 3
(b)4 33 42 3
(c)4 3 3 4 2 3
(d)None of these

[Q017] What will be the output of the following program :
int main()
{
   int a=1;
   if (a == 2);
      printf("C Program");
   return(0);
}

(a)No Output
(b)C Program
(c)Compile-Time Error

[Q018] What will be the output of the following program :

int main()
{
   int a=1;
   if (a)
      printf("Test");
   else;
      printf("Again");
   return(0);
}

(a)Again
(b)Test
(c)Compile-Time Error
(d)TestAgain

[Q019] What will be the output of the following program :
int main()
{
   int i=1;
   for (; i<4; i++);
        printf("%dn",i);
   return(0);
}

(a)No Output
(b)1
      2
      3
(c)4
(d)None of these

[Q020] What will be the output of the following program :

  int main()
{
   int a,b;
   for (a=0; a<10; a++);
        for (b=25; b>9; b-=3);
             printf("%d %d",a,b);
   return(0);
}

(a)Compile-Time error
(b)10 9
(c)10 7
(d)None of these

[Q021] What will be the output of the following program :
int main()
{
   float i;
   for (i=0.1; i<0.4; i+=0.1)
        printf("%.1f",i);
   return(0);
}

(a)0.10.20.3
(b)Compile-Time Error
(c)Run-Time Error
(d)No Output

[Q022] What will be the output of the following program :

int main()
{
   int i;
   for (i=-10; !i; i++);
        printf("%d",-i);
   return(0);
}

(a)0
(b)Compile-Time Error
(c)10
(d)No Output

[Q023] What will be the output of the following program :

int main()
{
   int i=5;
   do;
      printf("%d",i--);
   while (i>0);
   return(0);
}

(a)5
(b)54321
(c)Compile-Time Error
(d)None of these

[Q024] What will be the output of the following program :

int main()
{
   int i;
   for (i=2,i+=2; i<=9; i+=2)
        printf("%d",i);
   return(0);
}

(a)Compile-Time error
(b)2468
(c)468
(d)None of these

[Q025] What will be the output of the following program :

int main()
{
   int i=3;
   for (i--; i<7; i=7)
        printf("%d",i++);
   return(0);
}

(a)No Output
(b)3456
(c)23456
(d)None of these

[Q026] What will be the output of the following program :

int main()
{
   int i;
   for (i=5; --i;)
        printf("%d",i);
   return(0);
}

(a)No Output
(b)54321
(c)4321
(d)None of these

[Q027] What will be the output of the following program :
int main()
{
   int choice=3;
   switch(choice)
   {
     default:
         printf("Default");

     case 1:
         printf("Choice1");
         break;

     case 2:
         printf("Choice2");
         break;
   }
   return(0);
}

(a)No Output
(b)Default
(c)DefaultChoice1
(d)None of these

[Q028] What will be the output of the following program :

int main()
{
   static int choice;
   switch(--choice,choice-1,choice-1,choice+=2)
   {
       case 1:
           printf("Choice1");
           break;

       case 2:
           printf("Choice2");
           break;

       default:
           printf("Default");
   }
   return(0);
}

(a)Choice1
(b)Choice2
(c)Default
(d)None of these

[Q029] What will be the output of the following program :

int main()
{
   for (;printf(""););
   return(0);
}

(a)Compile-Time error
(b)Executes ONLY once
(c)Executes INFINITELY
(d)None of these

  [Q030] What will be the output of the following program :
int main()
{
   int i;
   for (;(i=4)?(i-4):i++;)
        printf("%d",i);
   return(0);
}

(a)Compile-Time error
(b)4
(c)Infinite Loop
(d)No Output

SOLUTIONS

Solutions - Decision-making, Bit-wise operations, Branching and Looping

[Q001]

(b)Compile-Time Error
Too few arguments to function 'printf'.

[Q002]

(c)No Output
Here NULL is treated as a NULL string.

[Q003]

(c)%
% is a format specifier and it prints %. The excess arguments are merely ignored i.e. 7.

[Q004]

(d)//
is an escape sequence but not /. Thus it prints // and the excess arguments are merely ignored i.e. 5.

[Q005]

(c)d%
%d is a format specifier but not d%. Thus it prints d% and it ignores the excess arguments i.e. 8.

[Q006]

(a)123
"%d"+0 in the printf statement has no effect on the output operation. Thus it prints 123.

[Q007]

(c)d

"%d"+1 (or > 0) in the printf statement affects the program output by considering "%d" as string and ignores the excess argument i.e. 123. Here 1 refers to the index i.e. 2nd character in the array or string "%d"

[Q008]

(b)Hi!Bye6

L->R priority and the length of the strings 'Hi!' & 'Bye' is 3+3=6. The statement printf returns the no. of bytes displayed onto the screen.

[Q009]

(b)Hi!Bye9
L->R priority and the length of the strings 'Hi!' & 'Bye' is 3*3=9. The statement printf returns the no. of bytes displayed onto the screen.

[Q010]

(a)0

L->R priority and the length of the two strings are 0+0=0. The statement printf returns the no. of bytes displayed onto the screen.

[Q011]

(b)Friends

(base adress of the string 'Hi Friends')+0 points to the value 'H'. Now the NEW (base address) equals (base address)+3 that points to the character 'F'. Thus it prints the string from 'F' onwards.

[Q012]

(b)C For Swimmers
The value returned by the printf statements need not be stored or simply ignored. It is a valid C code.

[Q013]

  (c)/*-*/
is an escape sequence character. Be careful while analyzing such statements.

[Q014]

  (d)7
It is a VALID C code. Prints 7 and returns the same to the Operating System. NOTE: Last printf statement will not be executed.

[Q015]

(c)Infinite Loop

main is a function so it can be called by any other function including itself. Here main is called by itself and it runs infinite number of times i.e. till the memory exists.

[Q016]

  (d)WorkHard
It is a valid C code. First it prints the word 'Work' and then 'Hard'.

[Q017]

(c)25

First parameter contains the format specifier & the Second parameter contains the actual value 25.

[Q018]

(a)Compile-Time Error

Generates compile-time error message. Parse error before '.' token.

[Q019]

(a)10
R->L priority. The second format specifier '%d' is an excess argument and it is ignored.

[Q020]

(b)Compiler dependant

The output varies from compiler to compiler in different platforms.

[Q021]

Execute & understand the output format.

[Q022]

(b)2

It is a valid C code. scanf statement is embedded inside the printf statement get executed first. scanf statement returns the number of input fields successfully scanned, converted and stored.

[Q023]

  (b)30

During pre-processing the macro calls are merely replaced by the replacement text. Be careful while analyzing macro calls.

[Q024]

(c)Compile-Time Error

Unterminated comment or Comment statement not ended properly i.e */ is missing in the above C code.

[Q025]

  (d)a
Alphabet 'a' is the ASCII equivalent of 97. printf statement return the number of bytes displayed onto the screen and it can be ignored.

[Q026]

  (d)CSkills7

printf statement return the number of bytes displayed onto the screen. The length of the strings 'C' and 'Skills' are 1 + 6 = 7.

[Q027]

(b)TestSuccess

It is valid C code. printf statement return the number of bytes displayed onto the screen.

[Q028]

(a)bbbbb5 (where b means blankspace)

Here '*' specifies the precision. First val is the precision and second val is the actual value. Thus it prints 5 BLANK SPACES & then the value 5.

[Q029]

(c)55

%d format specifier is replaced by the contents of the variable val i.e. 5 followed by another 5.

[Q030]

(a) Compile-Time Error

Incorrect usage of pair of braces } and {. Correct usage : Each compound statement should be enclosed within a pair of braces, i.e. { and

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