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Hey all,
So,
for my final in C# we have to write a few programs. Some of them being
pretty simple. The one I'm doing now asks me to write a weight
conversion program with a minimum of grams, ounces, kilograms and
pounds. If the user enters a negative number or a letter then it's
supposed to throw and handle an exception. Well, everything was going
great until I encountered this problem.
At the moment, I'm
trying to convert grams to kilograms, pounds and ounces. It works great
when I'm converting grams to ounces or kilograms, but whenever I want
to convert the grams to pounds, it handles an exception and says
"Invalid input value.". I have the user select what they want to
convert said grams to by inputting a number. The number for pounds is
3, but whenever the user enters 3 to convert to pounds it handles said
exception.
Here's my code:
WeightConverterTest Class
using System;
using System.Collections.Generic;
using System.Text;
namespace Final_Question_3
{
class WeightConverterTest
{
static void Main(string[] args)
{
//declare variables
int selection = 0;
while (selection < 5)
{
try
{
//prompt user to select a measurement type to be converted
Console.WriteLine("Select measurement type:" +
"\n1) Grams\t2) Kilograms\t3) Ounces\t4) Pounds\n" +
"5) Exit the program.\n");
selection = Convert.ToInt32(Console.ReadLine());
/*if statement which checks if the user wanted to end the
program of if they entered a selection between 1 and 5*/
if (selection == 5)
Console.WriteLine("Exiting program.");
else if (selection < 1 || selection > 5)
Console.WriteLine("Please enter a selection between 1 and 5.\n");
else
SelectionMethod(selection);
}//end try
//if input value is not numeric, display message
catch
{
Console.WriteLine("Invalid input value.");
}//end catch
}//end while
}//end Main method
public static int SelectionMethod(int s)
{
//declare variables and create reference to WeightConverter class
WeightConverter weightConverter = new WeightConverter();
decimal grams = 0;
decimal kilograms = 0;
decimal ounces = 0;
decimal pounds = 0;
try
{
switch (s)
{
//if user chose to input grams, prompt user to enter how many
case 1:
Console.WriteLine("Input amount of grams to be converted:\n");
grams = Convert.ToDecimal(Console.ReadLine());
//call Grams method of class WeightConverter
weightConverter.Grams(grams);
break;
//if user chose to input kilograms, prompt user to enter how many
case 2:
Console.WriteLine("Input amount of kilograms to be conveted:\n");
kilograms = Convert.ToDecimal(Console.ReadLine());
//call Kilograms method of class WeightConverter
weightConverter.Kilograms(kilograms);
break;
//if user chose to input ounces, prompt user to enter how many
case 3:
Console.WriteLine("Input amount of ounces to be converted:\n");
ounces = Convert.ToDecimal(Console.ReadLine());
//call Ounces method of class WeightConverter
weightConverter.Ounces(ounces);
break;
//if user chose to input pounds, prompt user to enter how many
case 4:
Console.WriteLine("Input amount of pounds to be converted:\n");
pounds = Convert.ToDecimal(Console.ReadLine());
//call Pounds method of class WeightConverter
weightConverter.Pounds(pounds);
break;
}
}//end try
//if input value is not numeric, display message
catch
{
Console.WriteLine("Invalid input value.");
}//end catch
return s;
}//end Selection method
}
}
WeightConverter Class
using System;
using System.Collections.Generic;
using System.Text;
namespace Final_Question_3
{
class WeightConverter
{
public decimal Grams(decimal g)
{
//declare variables
decimal kilograms = 0;
decimal ounces = 0;
decimal pounds = 0;
int selection = 0;
while (selection <= 4)
{
try
{
//prompt user to select what they would like to convert grams to
Console.WriteLine("Convert grams to?\n1) Kilograms\t2) Ounces \t3) Pounds" +
"\n4) Return to first selection.");
selection = Convert.ToInt32(Console.ReadLine());
switch (selection)
{
//convert grams to kilograms
case 1:
kilograms = g / 1000;
Console.WriteLine("{0} gram(s) is {1} kilogram(s).", g, kilograms);
break;
//convert grams to ounces
case 2:
ounces = g / (int)28.31257;
Console.WriteLine("{0} gram(s) is {1} ounce(s).", g, ounces);
break;
//convert grams to pounds
case 3:
pounds = g / 453;
Console.WriteLine("{0} gram(s} is {1} pound(s).", g, pounds);
break;
//return to first selection
case 4:
selection = 5;
break;
}
}//end try
//if value entered is not numeric, display message
catch
{
Console.WriteLine("Invalid input value.");
}//end catch
}//end while
return g;
}
public decimal Kilograms(decimal kg)
{
decimal grams = 0;
decimal ounces = 0;
decimal pounds = 0;
return kg;
}
public decimal Ounces(decimal o)
{
decimal grams = 0;
decimal kilograms = 0;
decimal pounds = 0;
return o;
}
public decimal Pounds(decimal p)
{
decimal grams = 0;
decimal kilograms = 0;
decimal ounces = 0;
return p;
}
}
}
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