Query: prime number or not

Question

Look at my code pls... I tried to make a query where you type in a number and it outputs if it is a prime numer or not...

x needs to be defined as integer number I guess but I don't know how... I just started with javascript so I know the code is might wrong in general.

I would be very grateful if someone could help me with my code.

https://code.sololearn.com/WDBeaUNRUBIM/?ref=app

Answer 1

Here is a better way.
https://code.sololearn.com/Wx071DYM163i/?ref=app

Answer 2

Wait, JS has no "int". Ints and doubles all are "Number".
Instead of division use modulus("%") and check if it is 0. Also, check only for 2,3,5 and 7 not all nos.
And what are you doing with the variable x? Its value is "undefined". That way all numbers will be prime.

Answer 3

Plus, you also need to check that the number itself is not 2 and 3 and 5 and 7

Answer 4

i don't think the way you are identifying a number as prime is correct
//1 more thing if Integer/Integer is an integer in iavascript , then no point of this algorithm (it might not work) , U can use double & take %1 //if 0 comes , then it means its an integer , else have a decimal part

Answer 5

var number = parseInt(prompt("Enter a number"));

Answer 6

thx but that doesnt help my code :( I need x to be integer number... so when I type in a number at first place (for example: 12) I want it to check if the number divided by 2 or 3 or 4 or... equals a integer number ...

I dont think the problem is in the var number... because I type in that number anyway ..

Answer 7

Maybe anyone can build me a short code of what I want to reach :)

I dont understand what I have to change in my code to get the solution I want..

I want to type in a number and the code should check whether its a prime number or not...

at the end the programm's output should be:

This is a prime number

or

This isn't a prime number

I would be very grateful if someone can create me a code for this !! thx

Answer 8

wow thx a lot for those inputs ;)

thats exactly what I was looking for.. I have been learning javascript for only a week now.. so I am not used to all functions but you all helped me a lot.

Big thanks for writing that amazing code :) !!!

I love this community.. I hope I can help you some day too when I am better at js.

chris