C Programming Questions and Answers – Register Variables – 2

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Register Variables – 2”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

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1. When compiler accepts the request to use the variable as a register?
a) It is stored in CPU
b) It is stored in cache memory
c) It is stored in main memory
d) It is stored in secondary memory
View Answer

Answer: a
Explanation: None.

2. Which data type can be stored in register?
a) int
b) long
c) float
d) all of the mentioned
View Answer

Answer: d
Explanation: None.
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3. Which of the following operation is not possible in a register variable?
a) Reading the value into a register variable
b) Copy the value from a memory variable
c) Global declaration of register variable
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

4. Which among the following is the correct syntax to declare a static variable register?
a) static register a;
b) register static a;
c) Both static register a; and register static a;
d) We cannot use static and register together
View Answer

Answer: d
Explanation: None.
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5. Register variables reside in ________
a) stack
b) registers
c) heap
d) main memory
View Answer

Answer: b
Explanation: None.

6. What will be the output of the following C code?

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  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         register int x = 0;
  5.         if (x < 2)
  6.         {
  7.             x++;
  8.             main();
  9.         }
  10.     }

a) Segmentation fault
b) main is called twice
c) main is called once
d) main is called thrice
View Answer

Answer: a
Explanation: None.
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7. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         register int x;
  5.         printf("%d", x);
  6.     }

a) 0
b) Junk value
c) Compile time error
d) Nothing
View Answer

Answer: b
Explanation: None.

8. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     register int x;
  3.     void main()
  4.     {
  5.         printf("%d", x);
  6.     }

a) Varies
b) 0
c) Junk value
d) Compile time error
View Answer

Answer: d
Explanation: None.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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