Prime example

Task

Create a program that takes in a number from the user.

• Print all the factors of this given number
• If there are no factors, this is a prime number – report this to the user

Solution

Enter your number:

Show Code

Code

function factors() {
	//get user input
	let userInput = parseInt( document.getElementById(“number-input”).value);
	console.log(“User input = ” + userInput);
	//check input is a number (parseInt)
	let checkType = typeof userInput;
	console.log(“Type = ” + checkType);
	//display number
	document.getElementById(“display-number”).innerHTML = “You selected: ” + userInput;
	// program to find the factors of an integer
	console.log(`The factors of ${userInput} is:`);
	//declare empty variable
	let factors=””;
	// looping through 1 to num
	for(let i = 1; i <= userInput; i++) {
	// check if number is a factor
	if(userInput % i == 0) {
	console.log(i);
	factors = factors + i + ” is a factor of ” + userInput + “<br />”;
	document.getElementById(“display-factors”).innerHTML = factors;
	}
	}
	}