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- Question
In which header file is the NULL macro defined?
Options- A. stdio.h
- B. stddef.h
- C. stdio.h and stddef.h
- D. math.h
- Correct Answer
- stdio.h and stddef.h
ExplanationThe macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h. - 1. The operator used to get value at address stored in a pointer variable is
Options- A. *
- B. &
- C. &&
- D. || Discuss
- 2. Which of the following is the correct usage of conditional operators used in C?
Options- A. a>b ? c=30 : c=40;
- B. a>b ? c=30;
- C. max = a>b ? a>c?a:c:b>c?b:c
- D. return (a>b)?(a:b) Discuss
- 3. In which order do the following gets evaluated
1. Relational 2. Arithmetic 3. Logical 4. Assignment
Options- A. 2134
- B. 1234
- C. 4321
- D. 3214 Discuss
- 4. Which of the following correctly shows the hierarchy of arithmetic operations in C?
Options- A. / + * -
- B. * - / +
- C. + - / *
- D. / * + - Discuss
- B - Brackets first
- O - Orders (ie Powers and Square Roots, etc.)
- DM - Division and Multiplication (left-to-right)
- AS - Addition and Subtraction (left-to-right)
- 5. Which of the following is the correct order of evaluation for the below expression?
z = x + y * z / 4 % 2 - 1
Options- A. * / % + - =
- B. = * / % + -
- C. / * % - + =
- D. * % / - + = Discuss
- 6. What is (void*)0?
Options- A. Representation of NULL pointer
- B. Representation of void pointer
- C. Error
- D. None of above Discuss
- 7. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?
Options- A. .
- B. &
- C. *
- D. -> Discuss
- 8. Can you combine the following two statements into one?
char *p; p = (char*) malloc(100);
Options- A. char p = *malloc(100);
- B. char *p = (char) malloc(100);
- C. char *p = (char*)malloc(100);
- D. char *p = (char *)(malloc*)(100); Discuss
- 9. A pointer is
Options- A. A keyword used to create variables
- B. A variable that stores address of an instruction
- C. A variable that stores address of other variable
- D. All of the above Discuss
- 10. How many bytes are occupied by near, far and huge pointers (DOS)?
Options- A. near=2 far=4 huge=4
- B. near=4 far=8 huge=8
- C. near=2 far=4 huge=8
- D. near=4 far=4 huge=8 Discuss
Pointers problems
Search Results
Correct Answer: *
Correct Answer: max = a>b ? a>c?a:c:b>c?b:c
Explanation:
Option A: assignment statements are always return in paranthesis in the case of conditional operator. It should be a>b? (c=30):(c=40);
Option B: it is syntatically wrong.
Option D: syntatically wrong, it should be return(a>b ? a:b);
Option C: it uses nested conditional operator, this is logic for finding greatest number out of three numbers.
Correct Answer: 2134
Explanation:
2. Arithmetic operators: *, /, %, +, -
1. Relational operators: >, <, >=, <=, ==, !=
3. Logical operators : !, &&, ||
4. Assignment operators: =
1. Relational operators: >, <, >=, <=, ==, !=
3. Logical operators : !, &&, ||
4. Assignment operators: =
Correct Answer: / * + -
Explanation:
Simply called as BODMAS (Bracket of Division, Multiplication, Addition and Subtraction).
How Do I Remember ? BODMAS !
Correct Answer: * / % + - =
Explanation:
C uses left associativity for evaluating expressions to break a tie between two operators having same precedence.
Correct Answer: Representation of NULL pointer
Correct Answer: ->
Correct Answer: char *p = (char*)malloc(100);
Correct Answer: A variable that stores address of other variable
Correct Answer: near=2 far=4 huge=4
Explanation:
near=2,
far=4 and
huge=4 pointers exist only under DOS. Under windows and Linux every pointers is 4 bytes long.
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