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- Question
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
- Correct Answer
- 1, 2, 3
ExplanationAn 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.
Expressions problems
Search Results
- 1. 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.- 2. Which of the following special symbol allowed in a variable name?
Options- A. * (asterisk)
- B. | (pipeline)
- C. - (hyphen)
- D. _ (underscore) Discuss
Correct Answer: _ (underscore)
Explanation:
Variable names in C are made up of letters (upper and lower case) and digits. The underscore character ("_") is also permitted. Names must not begin with a digit.Examples of valid (but not very descriptive) C variable names:
=> foo
=> Bar
=> BAZ
=> foo_bar
=> _foo42
=> _
=> QuUx
- 3. By default a real number is treated as a
Options- A. float
- B. double
- C. long double
- D. far double Discuss
Correct Answer: double
Explanation:
In computing, 'real number' often refers to non-complex floating-point numbers. It include both rational numbers, such as 42 and 3/4, and irrational numbers such as pi = 3.14159265...When the accuracy of the floating point number is insufficient, we can use the double to define the number. The double is same as float but with longer precision and takes double space (8 bytes) than float.
To extend the precision further we can use long double which occupies 10 bytes of memory space.
- 4. Identify which of the following are declarations
1 : extern int x; 2 : float square ( float x ) { ... } 3 : double pow(double, double);
Options- A. 1
- B. 2
- C. 1 and 3
- D. 3 Discuss
Correct Answer: 1 and 3
Explanation:
extern int x; - is an external variable declaration.
double pow(double, double); - is a function prototype declaration.
Therefore, 1 and 3 are declarations. 2 is definition.- 5. What are the types of linkages?
Options- A. Internal and External
- B. External, Internal and None
- C. External and None
- D. Internal Discuss
Correct Answer: External, Internal and None
Explanation:
External Linkage-> means global, non-static variables and functions.
Internal Linkage-> means static variables and functions with file scope.
None Linkage-> means Local variables.- 6. 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.- 7. 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 !
- 8. 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: =- 9. 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
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.
- 10. The operator used to get value at address stored in a pointer variable is
Options- A. *
- B. &
- C. &&
- D. || Discuss
Correct Answer: *
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- 1. Which of the following is the correct order if calling functions in the below code?