Declarations C Questions And Answers

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Declarations C Questions and Answers

1. What is the output of this C code? void foo(const int *); int main() { const int i = 10; printf("%d ", i); foo(&i); printf("%d", i); } void foo(const int *i) { *i = 20; }

Declarations C Questions and Answers

2. Comment on the output of this C code? int main() { const int i = 10; int *ptr = &i; *ptr = 20; printf("%d\n", i); return 0; }

Declarations C Questions and Answers

3. What is the output of this C code? int main() { j = 10; printf("%d\n", j++); return 0; }

Declarations C Questions and Answers

4. Does this compile without error? int main() { for (int k = 0; k < 10; k++); return 0; }

Declarations C Questions and Answers

5. Does this compile without error? int main() { int k; { int k; for (k = 0; k < 10; k++); } }

Declarations C Questions and Answers

6. Which of the following declaration is not supported by C?

Declarations C Questions and Answers

7. Which of the following format identifier can never be used for the variable var? int main() { char *var = "Advanced Training in C by AllIndiaExams.com"; }

Declarations C Questions and Answers

8. Which of the following declaration is illegal?

Declarations C Questions and Answers

9. Which keyword is used to prevent any changes in the variable within a C program?

Declarations C Questions and Answers

10. Which of the following is not a pointer declaration?

Declarations - C Multiple Choice Questions and Answers

This is the c programming questions and answers section on "Declarations and Initializations" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand. What are Declarations in C Langauge? Are you ready to know about it? Then check this article to find the Declarations C Questions. Contenders can refer to the last portion of this page to see the Declarations C Online Test. For all the applicants the arranged Declarations C Quiz will be available for free of cost. So, the postulates can learn the Declarations C Questions and Answers by taking part in the mock test. In the below table, we have provided all the information related to the Declarations C MCQ Quiz. Thus, the competitors can check and prepare the multiple choice questions regarding Declarations in C Langauge.

Declarations C Questions - Declarations C Quiz Details

Online Test Name	Declarations
Exam Type	Multiple Choice Questions
Category	Computer Science Engineering Quiz
Number of Questions	14

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Declarations C Multiple Choice Questions

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Declarations MCQ Quiz Answers with Solutions

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1. What is the output of this C code?

void foo(const int *);
int main()
{
const int i = 10;
printf("%d ", i);
foo(&i);
printf("%d", i);
}
void foo(const int *i)
{
*i = 20;
}

A. Compile time error
B. 10 Â Â 20
C. Undefined value
D. 10

Answer & Explanation

Answer: Option A

Explanation:

Cannot change a const type value.
Output:
$ cc pgm1.c
pgm1.c: In function â€˜fooâ€™:
pgm1.c:13: error: assignment of read-only location â€˜*iâ€™

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2. Comment on the output of this C code?

int main()
{
const int i = 10;
int *ptr = &i;
*ptr = 20;
printf("%d\n", i);
return 0;
}

A. Compile time error
B. Compile time warning and printf displays 20
C. Undefined behaviour
D. 10

Answer & Explanation

Answer: Option B

Explanation:

Changing const variable through non-constant pointers invokes compiler warning
Output:
$ cc pgm2.c
pgm2.c: In function â€˜mainâ€™:
pgm2.c:5: warning: initialization discards qualifiers from pointer target type
$ a.out
20

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3. What is the output of this C code?

int main()
{
j = 10;
printf("%d\n", j++);
return 0;
}

A. 10
B. 11
C. Compile time error
D. 0

Answer & Explanation

Answer: Option C

Explanation:

Variable j is not defined.
Output:
$ cc pgm3.c
pgm3.c: In function â€˜mainâ€™:
pgm3.c:4: error: â€˜jâ€™ undeclared (first use in this function)
pgm3.c:4: error: (Each undeclared identifier is reported only once
pgm3.c:4: error: for each function it appears in.)

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4. Does this compile without error?

int main()
{
for (int k = 0; k < 10; k++);
return 0;
}

A. Yes
B. No
C. Depends on the C standard implemented by compilers
D. None of the mentioned

Answer & Explanation

Answer: Option C

Explanation:

Compilers implementing C90 does not allow this but compilers implementing C99 allow it.
Output:
$ cc pgm4.c
pgm4.c: In function â€˜mainâ€™:
pgm4.c:4: error: â€˜forâ€™ loop initial declarations are only allowed in C99 mode
pgm4.c:4: note: use option -std=c99 or -std=gnu99 to compile your code