C Programming Questions and Answers – Declarations – 2

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

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

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1. Which of the following declaration is illegal?
a) char *str = “Best C programming classes by Sanfoundry”;
b) char str[] = “Best C programming classes by Sanfoundry”;
c) char str[20] = “Best C programming classes by Sanfoundry”;
d) char[] str = “Best C programming classes by Sanfoundry”;
View Answer

Answer: d
Explanation: char[] str is a declaration in Java, but not in C.

2. Which keyword is used to prevent any changes in the variable within a C program?
a) immutable
b) mutable
c) const
d) volatile
View Answer

Answer: c
Explanation: const is a keyword constant in C program.
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3. Which of the following is not a pointer declaration?
a) char a[10];
b) char a[] = {‘1’, ‘2’, ‘3’, ‘4’};
c) char *str;
d) char a;
View Answer

Answer: d
Explanation: Array declarations are pointer declarations.

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

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  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int k = 4;
  5.         float k = 4;
  6.         printf("%d", k)
  7.     }

a) Compile time error
b) 4
c) 4.0000000
d) 4.4
View Answer

Answer: a
Explanation: Since the variable k is defined both as integer and as float, it results in an error.
Output:
$ cc pgm8.c
pgm8.c: In function ‘main’:
pgm8.c:5: error: conflicting types for ‘k’
pgm8.c:4: note: previous definition of ‘k’ was here
pgm8.c:6: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘double’
pgm8.c:7: error: expected ‘;’ before ‘}’ token

5. Which of the following statement is false?
a) A variable defined once can be defined again with different scope
b) A single variable cannot be defined with two different types in the same scope
c) A variable must be declared and defined at the same time
d) A variable refers to a location in memory
View Answer

Answer: c
Explanation: It is not an error if the variable is declared and not defined. For example – extern declarations.
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6. A variable declared in a function can be used in main().
a) True
b) False
c) True if it is declared static
d) None of the mentioned
View Answer

Answer: b
Explanation: Since the scope of the variable declared within a function is restricted only within that function, so the above statement is false.
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7. The name of the variable used in one function cannot be used in another function.
a) True
b) False
View Answer

Answer: b
Explanation: Since the scope of the variable declared within a function is restricted only within that function, the same name can be used to declare another variable in another function.

Sanfoundry Global Education & Learning Series – C Programming Language.

To practice all areas of C language, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
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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