Question

I’m fairly new to programming in general but have been working with Java for the past 2-3 months and decided to take a crack at C# on the side just for fun because I heard they were similar. The problem I’m having with this program, which is just a way for someone to convert an int to a percentage, is that it takes all my input correctly but the percentage always shows up as zero! For example, there are two input prompts: one that asks you for a number for converting and one that asks you what the number is out of. After both prompts the program displays correctly “Your percentage is: ” and then just writes 0 no matter what numbers I use for input, help please!

[code]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NumToPercentage
{
class Program
{
    static void Main(string[] args)
    {
        int userScore, userTotalScore, userPercentage;
        string userInput, userTotal;


        Console.WriteLine("Welcome to the number to percentile conversion program!");

        Console.WriteLine("Please enter your number here: ");
        userInput = Console.ReadLine();
        userScore = int.Parse(userInput); 

        Console.WriteLine("Please enter what the number is out of (i.e. 100, 42, 37, etc.): ");
        userTotal = Console.ReadLine();
        userTotalScore = int.Parse(userTotal);

        userPercentage = (userScore/userTotalScore)*100; 

        Console.WriteLine("Your percentage is: " + userPercentage); 
        Console.WriteLine("Press any key to exit.");
        Console.ReadLine();
    }
}
}

[/code]

Answer 1

The problem is integer math, it rounds towards zero.

• 1 divided by 100 is 0.
• 99 divided by 100 is 0.
• 199 divided by 100 is 1.

Convert at least one of the operands to a floating point type (double, float, decimal) when you perform your calculation.

double result = ((double)x / y) * 100;

If needed, you can always cast the result back to an integer if you are uninterested in the decimal places.

int finalPercent = (int)result;