# / cannot be applied to rand of type 'string' and 'int'

Hi,

I am new to the community and getting stuck on the following:

For an exercise I need to provide a few things, it will be an coin converter

1. To find the maximum number of gold coins that “fit” into the amount (e.g. one gold coin fits into 11 cents):
• Divide the amount by the value of a gold coin
• Round down to the nearest integer
• Store the result in a double variable called goldCoins

But continuously I got the error "Operator ‘/’ cannot be applied to rands of type ‘string’ and ‘int’"

The code I have;

``````using System;

namespace MoneyMaker
{
class MainClass
{
public static void Main(string[] args)
{
int gold = 10;
int silver = 5;

Console.WriteLine("Welcome to Money Maker!");

Console.WriteLine("Enter an amount to convert to coins:");
double userInputConvert = Convert.ToDouble(userInput);
Console.WriteLine(\$"{userInput} cents is equal to ...");

double goldCoins = Math.Floor(userInput / gold);

}
}
}
``````

The error causes because of the last line of code;

``````double goldCoins = Math.Floor(userInput / gold);
``````

If I change the variables in the () to numbers it will work, but this needs to calculate from the user input. That is why I think there should be a dividing between variables.

The error is pretty helpful? the division operator (`/`) can not be applied to rands of type string (`userInput`) and int (`gold`)

i mean, you convert the user input to a double, but you don’t end up using this double when doing the calculation.

Hi stetim94,

You are right about the error which is very helpful, but I didn’t quite understand it.

But what you’ve mentioned (you convert the user input to a double, but you don’t end up using this double when doing the calculation), made me thinking in the right direction.

The line of code which I had to change was:

``````      double goldCoins = Math.Floor(userInputConvert/ gold);
``````