Why this error?

Question

I solved code coach problem with this code and that was working there, but when I saved this code and trying to run the code it give me an error why this happen? Maybe this feature is disabled in SL IDE!!
https://code.sololearn.com/cDSkroK4EleU/?ref=app

Answer 1

The increase var is assigned to a readline() function, your code does not have access to it, thus
var increase = parseInt(readLine(), 10);
Comes up as undefined

This function was not visible in the challenge to prevent cheating, so you didn't get it when copying the whole code

Try using a value your code can access, instead of the function, and add a line that will generate output. Do following:

function main() {
var increase = 4;
var prices = [98.99, 15.2, 20, 1026]

for(i=0; i<prices.length; i++){
prices[i]+=increase
}
console.log(prices);
}
main()