Question

question: 2
what is the output of the following code?
function main() {
let x = 5;
quadruplenumber(x);
}

function quadruplenumber(x) {
let quadx = 4 * x;
console.log(quadx);
}

main();

○ 10
○ 15
○ 20
○ no output, there is a syntax error

Explanation:

Step1: Analyze the main function

In the main function, a variable x is declared and assigned the value 5. Then the function quadrupleNumber is called with x as the argument.

Step2: Analyze the quadrupleNumber function

The quadrupleNumber function takes a parameter x. Inside it, a variable quadX is calculated as 4 x. Given that the value of x passed from main is 5, we calculate 4 5.
$quadX = 4\times5 = 20$
Then, console.log(quadX) is used to print the value of quadX, which is 20.

Step3: Check for syntax errors

Looking at the code, there are no syntax errors. The function definitions and calls are properly structured in JavaScript (assuming this is JavaScript code, the syntax for variable declaration with let, function definitions, and console.log is correct).

Answer:

20 (corresponding to the option "20")