my int thinks its a double, how do i change this?

Question

im using an online compiler so maybe thats the reason that its not working.

so i set the TCoins int to 0

int TCoins = 0;

then after you defeat an enemy it adds to the int

TCoins = coins + TCoins;

then i made a shop system, so i check to see if you have the coin amount to be able to buy the item, then i subtract the coin amount needed to the coin amount you have, now for some reason it thinks its a double when i do this

if(Answer == "S" && TCoins >= (S + 1) * Math.Pow(10,(S+1)))
{
    TCoins = TCoins - (S + 1) * Math.Pow(10,(S+1));
    S++;
}

im new to coding, so i might be being dumb and not realising what the problem is.

Answer 1

Well, Math works with double and thus

Math.Pow(10,(S+1));

returns double result (for instance, if S == -2 we'll get 0.1). You can either cast:

(int) Math.Pow(10,(S+1))

or implement custom integer power:

public static class MathI {
  public static int Pow10(int value) {
    if (value < 0 || value > 9)
      throw new ArgumentOutOfRangeException(nameof(value));

    int result = 1;

    for (int i = 1; i <= value; ++i)
      result *= 10;

    return result;
  }
}

And then use MathI.Pow10(S + 1) instead of Math.Pow(10,S+1)