C Programming

CONTROL INSTRUCTIONS MCQs

Total Questions : 30

Page 1 of 3 pages
Question 1.

By default, the data type of a constant without a decimal point is int, whereas the one 

with a decimal point is a double.


  1.    Yes
  2.    No
 Discuss Question
Answer is Option A. -> Yes

6 is int constant. 
6.68 is double. 
6.68L is long double constant. 
6.68f is float constant. 

Question 2.

We want to test whether a value lies in the range 2 to 4 or 5 to 7. Can we do this using a switch?


  1.    Yes
  2.    No
 Discuss Question
Answer is Option A. -> Yes

We can do this in following switchstat ement

switch(a) { case 2: case 3: case 4: /* some statements */ break; case 5: case 6: case 7: /* some statements */ break; }

Question 3.

A char variable can store either an ASCII character or a Unicode character.


  1.    True
  2.    False
 Discuss Question
Answer is Option A. -> True

Yes, we can store either an ASCII character or a Unicode character in a char variable.

Question 4.

The way the break is used to take control out of switch and continue to take control 

of the beginning of the switch?


  1.    Yes
  2.    No
 Discuss Question
Answer is Option B. -> No

continue can work only with loops and not with switch

Question 5.

Can we use a switch statement to switch on strings?


  1.    Yes
  2.    No
 Discuss Question
Answer is Option B. -> No

The cases in a switch must either have integer constants or constant expressions.

Question 6.

The modulus operator cannot be used with a long double.


  1.    True
  2.    False
 Discuss Question
Answer is Option A. -> True

fmod(x,y) - Calculates x modulo y, the remainder of x/y. 
This function is the same as the modulus operator. But fmod() performs 

floating point or long doubledivisions.

Question 7.


Which of the following statements are correct about the below program?



#include<stdio.h>
int main()
{
int n = 0, y = 1;
y == 1 ? n=0 : n=1;
if(n)
printf("Yes\n");
else
printf("No\n");
return 0;
}

  1.    Error: Declaration terminated incorrectly
  2.    Error: Syntax error
  3.    Error: Lvalue required
  4.    None of above
 Discuss Question
Answer is Option C. -> Error: Lvalue required

No answer description available for this question. 

Question 8.

If scanf() is used to store a value in a char variable then along with the value a carriage return

(r) also gets stored it.


  1.    True
  2.    False
 Discuss Question
Answer is Option B. -> False

No, the carriage return tells the compiler to read the input from the buffer after 

ENTER key is pressed.

Question 9.

Which of the following sentences are correct about a switch loop in a C program?

1:switch is useful when we wish to check the value of variable against a particular set of values.

2:switch is useful when we wish to check whether a value falls in different ranges.

3:Compiler implements a jump table for cases used in switch.

4:It is not necessary to use a break in every switch statement.


  1.    1,2
  2.    1,3,4
  3.    2,4
  4.    2
 Discuss Question
Answer is Option B. -> 1,3,4

Question 10.

A short integer is at least 16 bits wide and a long integer is at least 32 bits wide.


  1.    True
  2.    False
 Discuss Question
Answer is Option A. -> True

The basic C compiler is 16 bit compiler, below are the size of it's data types 
The size of short int is 2 bytes wide(16 bits).
The size of long int is 4 bytes wide(32 bits).