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- Question
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)
- Correct Answer
- max = a>b ? a>c?a:c:b>c?b:c
ExplanationOption 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.
Expressions problems
Search Results
- 1. 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
Correct Answer: 2134
Explanation:
2. Arithmetic operators: *, /, %, +, -
1. Relational operators: >, <, >=, <=, ==, !=
3. Logical operators : !, &&, ||
4. Assignment operators: =- 2. 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)
Correct Answer: / * + -
Explanation:
Simply called as BODMAS (Bracket of Division, Multiplication, Addition and Subtraction).How Do I Remember ? BODMAS !
- 3. 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
Correct Answer: * / % + - =
Explanation:
C uses left associativity for evaluating expressions to break a tie between two operators having same precedence.- 4. Which of the following are unary operators in C?
1. ! 2. sizeof 3. ~ 4. &&
Options- A. 1, 2
- B. 1, 3
- C. 2, 4
- D. 1, 2, 3 Discuss
Correct Answer: 1, 2, 3
Explanation:
An operation with only one operand is called unary operation.
Unary operators:
! Logical NOT operator.
~ bitwise NOT operator.
sizeof Size-of operator.
&& Logical AND is a logical operator.
Therefore, 1, 2, 3 are unary operators.
- 5. Which of the following is the correct order if calling functions in the below code?
a = f1(23, 14) * f2(12/4) + f3();
Options- A. f1, f2, f3
- B. f3, f2, f1
- C. Order may vary from compiler to compiler
- D. None of above Discuss
Correct Answer: Order may vary from compiler to compiler
Explanation:
Here, Multiplication will happen before the addition, but in which order the functions would be called is undefined. In an arithmetic expression the parenthesis tell the compiler which operands go with which operators but do not force the compiler to evaluate everything within the parenthesis first.- 6. The operator used to get value at address stored in a pointer variable is
Options- A. *
- B. &
- C. &&
- D. || Discuss
Correct Answer: *
- 7. 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 Discuss
Correct Answer: stdio.h and stddef.h
Explanation:
The macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h.- 8. What is (void*)0?
Options- A. Representation of NULL pointer
- B. Representation of void pointer
- C. Error
- D. None of above Discuss
Correct Answer: Representation of NULL pointer
- 9. 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
Correct Answer: ->
- 10. 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
Correct Answer: char *p = (char*)malloc(100);
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- 1. In which order do the following gets evaluated