C Question Set 1-7

Tech Index 1 2 3 4 5 6 7

Question 1

'C' is a

machine  language

low level  language

middle level  language

high level  language



Question 2

What is the  error in the program?

char count;

main()

{

int count =  70;

{

extern int  count;

printf("\n  %d ", count);

}

}



Error: Type  mismatch in redeclaration of ' nn'

Error:  Multiple declaration for 'nn'

Error: Storage  class 'extern' is not allowed here

Linker Error:  Undefined symbol 'nn'





Question 3

What is the  output of the program?



void main()

{

int val = (5,  val = 5)/++val;

printf("\n  %d ", val);

}



5

1

6

0





Question 4

Which of the  following statements is used to return more than one value from a function?



return 1,2,3 ;

return (1,2,3)  ;

return ((1),  (2), (3));

None of the  above





Question 5

Which of the  following is wrong with respect to structures?



Having the  same name for a structure and its variable

It has  functions as its data members

It has a data  member, which is of the same structure kind

Both B and C





Question 6

What is the  error in the code shown below?



union

{

int val1 : 5;

char val2;

};



Declaration of  variables is not possible due to the absence of tag name

Arrays of this  union cannot be created

Cannot be used  in file handling

All the three  B, C and D





Question 7

What is an  '&' operator?



logical

unary

bitwise

ternary





Question 8

What is the  difference between malloc and calloc?



in allocation  of memory

in return  types

number of  arguments

None of the  above





Question 9

What is the  default promotion for 'float' in va_arg?



double

int

long int

char





Question 10

What is the  error in the program?



main()

{

int a = 12;

int *ptr =  &a;

printf( "  %d %d ", *ptr /*ptr, *ptr**ptr);

}



No error,  output is 1 144



No error,  output is 144 144



Unexpected end  of file found



Error: illegal  pointer operation





Question 11

What is the  significance of the function realloc()?



realloc()  adjusts the size of the allocated block to specified size

realloc()  allocates memory on far heap

It is used to  allocate more than 64k bytes

realloc()  allocates the specified number of bytes in registers





Question 12

What is the  error in the program?



main()

{

typedef struct  personal

{

int  name[25]:15;

}

personal;  personal person;

}



Error: Bit  fields must be signed or unsigned int

Error:  Multiple declaration for 'personal'

Error:  Undefined symbol 'personal'

Error: Size of  the type is unknown or zero





Question 13

What is the  return type of fflush()?



void

FILE*

char*

int





Question 14

What is the  error in the program?



void  myprintf()

{

printf("\n  %d ", printf("Genesis"));

}

main() {

printf("\n  %d ", myprintf());

}



Error: Type  mismatch in 'printf'

The return  type of a function must be an integer

Error: printf  cannot return anything

Cannot convert  from 'void' to '...'





Question 15

What is the  meaning of a static function?



It is local to  a file in which it is declared

It is local to  main()

The set of  variables used in the function is 'static'

All the linked  files can access it





Question 16

What is the  output of the program?



# include  <stdio.h>



void main()

{

int main = 90;

top :  printf("Label1");

if(main)

goto top;

}



Infinite

Label1

No output

label top is  invalid





Question 17

How many times  is the 'for' loop/statement is executed in the following code.



main()

{

unsigned char  ch;

for(ch = 0; ch  <= 255; ch++);

}



Infinite

255

256

127





Question 18

What is  maximum number of 'case' values in a switch statement?



255

127

No specific  limit

128





Question 19

What is the  output of the program?



void main()

{

int x = (90, x  = 90)+++x;

printf("\n  %d ", x);

}



90

1

181

91





Question 20

Where do we  use a 'continue' statement?



In 'if'  statement

In 'switch'  statement

In 'goto'  labels

None of the  above





Answers

Answer 1 - C

Answer 2 - A

Answer 3 - B

Answer 4 - D

Answer 5 - D

Answer 6 - D

Answer 7 - C

Answer 8 - C

Answer 9 - A

Answer 10 - C

Answer 11 - A

Answer 12 - A

Answer 13 - D

Answer 14 - D

Answer 15 - A

Answer 16 - A

Answer 17 - A

Answer 18 - C

Answer 19 - C

Answer 20 - D