Answer & Solution
Answer: Option A
Solution:
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.
