C#

static /*int*/ float readInteger (string prompt) // should be named readFloat !!!
{
    do
    {
       Console.Write(prompt);
       float value;
       if (float.TryParse(Console.ReadLine(), out value))
            return value;
       Console.WriteLine("That is not a valid number");
       Console.WriteLine("Enter a number, e.g. 15.5");
    } while (true);
}

// ...
if (nameString.Length != 0)
{
    finished = true;
}
else
{
    costPrice = readInteger("Enter price of the product : ");
    // It should be named readFloat as I noted above!
 
    if (costPrice < 20.0f)
// ...

Matt T Heffron wrote:

You have a method whose signature says it is returning int, but you
are returning a string!

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

Matt T Heffron wrote:

You have a method whose signature says it is returning int, but you
are returning a string!

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

Eddy Vluggen wrote:

I would still recommend using integers, not floats. You cannot pay half a cent AFAIK, and it would eliminate rounding errors

Matt T Heffron wrote:

Of course, this is exactly what the decimal data type is for!

Compared to floating-point types, the decimal type has more precision and a smaller range, which makes it appropriate for financial and monetary calculations.

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

Eddy Vluggen wrote:

Show me 0.000783678 cents and I might change my mind

Matt T Heffron wrote:

349.9 cents/gallon

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

jamesmc1535 wrote:

it doesnt come with a build in compiler

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]