Operators and Expressions in C++ MCQ question and answer with solution | C++ Programimg MCQs

The correct answer is B: 11

Let's break down why:

C++ follows the standard order of operations (often remembered by the acronym PEMDAS/BODMAS).
This means:

* Parentheses/Brackets (None in this expression)
* Exponents/Orders (None in this expression)
* Multiplication and Division (from left to right)
* Addition and Subtraction (from left to right)

In the expression 5 + 3 * 2:

1. First, we perform the multiplication: 3 * 2 = 6
2. Then, we perform the addition: 5 + 6 = 11

Therefore, the result of the expression is 11.
Option A (16) is incorrect because it doesn't follow the order of operations (it would result from doing 5+3 first).
Option C (10) is incorrect for the same reason.
Option D (Compiler error) is incorrect. The expression is perfectly valid in C++ and will compile and run.

Let's break down this C++ expression step by step, just like you would in regular math!
The expression is: 3 * (4 + 2)

In C++ (and most programming languages), we follow a set of rules called operator precedence. This means some operations are performed before others. It's similar to the PEMDAS (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction) or BODMAS rule you might know from mathematics.

The most important rule here is: Parentheses ( ) always come first! Any calculation inside parentheses is done before anything outside them.

1. First, evaluate the expression inside the parentheses:
We have (4 + 2).
4 + 2 = 6

2. Now, substitute this result back into the original expression:
The expression now becomes: 3 * 6

3. Finally, perform the multiplication:
3 * 6 = 18

So, the result of the expression 3 * (4 + 2) in C++ is 18.

Therefore, Option A: 18 is the correct answer.

Why not other options?
* Options B and C are incorrect because they do not follow the correct order of operations. If you did 3 * 4 first (12), then added 2, you'd get 14, which is not an option and still incorrect. The parentheses *must* be solved first.
* Option D: Compiler error is incorrect because this is a perfectly valid and well-formed C++ expression. The compiler understands the parentheses and the operators (* and +) and will correctly calculate the result.