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Expressions - C Programming Questions and Answers - RejinpaulPlacement

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1.
In which order do the following gets evaluated
1. Relational
2. Arithmetic
3. Logical
4. Assignment
Answer & Solution
Answer: (A) 2134
Solution: 2. Arithmetic operators: *, /, %, +, -
1. Relational operators: >, <, >=, <=, ==, !=
3. Logical operators : !, &&, ||
4. Assignment operators: =
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2.
Which of the following are unary operators in C?
1. !
2. sizeof
3. ~
4. &&
Answer & Solution
Answer: (D) 1, 2, 3
Solution: 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.
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3.
Which of the following is the correct order if calling functions in the below code?
a = f1(23, 14) * f2(12/4) + f3();
Answer & Solution
Answer: (C) Order may vary from compiler to compiler
Solution: 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.
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4.
Which of the following is the correct usage of conditional operators used in C?
Answer & Solution
Answer: (C) max = a>b ? a>c?a:c:b>c?b:c
Solution: 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.
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5.
Which of the following correctly shows the hierarchy of arithmetic operations in C?
Answer & Solution
Answer: (D) / * + -
Solution: Simply called as BODMAS (Bracket of Division, Multiplication, Addition and Subtraction).

How Do I Remember ? BODMAS !

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)
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