TryParse Used In Function - Convert Celsius To Fahrenheit
Mar 28, 2010
I am creating a program that will convert Celsius to Fahrenheit and visa versa. The program must use a function to return the answer. I'm using a string function that will return either the temperature in Celsius or Fahrenheit or "Please enter a valid temperature" if anything but a number is entered. TryParse is used to check if the input is valid.
When using the TryParse method in the function I am trying to use a parameter to pass the variable that will store the converted data type value [Code] The line " If Double.TryParse(tempTextBox.Text, scale) Then " is supposed to check if the conversion is possible and if it is pass either F or C as a variable to the scale parameter. It seems to verify the conversion all right but it doesn't actually do the conversion. Why isn't doing the conversion? Both F and C remain 0. I can get it to work by using two more TryParse methods (one in each branch of the If else statement in the function), but I'd rather not do this.
I've figured out the Variable declaration and coding to make it work:
Dim Celsius, Fahrenheit As Double Try Celsius = CDbl(txtCelsius.Text)
[Code]....
I'm gettting an "error": Option strict on dissallows implicit conversions from string to double? I have a textbox for celsius input that I want stored and converted into a label with the Convert Button Click Event.
This is what i have i need for it to run and ask for celsius instead of fahrenheit but it is not doing it..
[code]...
I am not understand this at all i am suppose also ask users to input a celsius degree for this part.its telling me i nedd to change formula to calculate the fahrenheit temp for this part.
I've been looking at this code for about 3 days now and I can't seem to get what I did wrong. When I run it as a console application I get "0 : 32" a lot of times.
The purpose of this code is to start at 0 degrees Celsius and work our way up to 100 by 10's. IE:
0 degrees C = 32 degrees F 10 degrees C = 50 degrees F etc.. too 100 degrees C = 212 degrees F
Module Module1
Sub Main() 'Program: Celsius to Fahrenheit Conversion 'Programmer: T
I've got this far with my interface and layout and buttons. I cannot figure out to do the functions for converting to and from celsius and fahrenheit.[code]...
I have already completed most of the program and it works, except when there is no input in the Fahrenhiet or is left blank.I get the following exception: on this code: Inputsingle = CSng(TextBox1.Text).Conversion from string "" to type 'Single' is not valid.Here is my code:
'Project" Convert Tempertures
'Progammer: Cathy R. Hjelm
'Description: Convert Fahrenheit temperture to Centigrade Temperature using a convert button and output Text Box[code]....
The formula is F = 9/5C + 32 where F is Fahrenheit and C is centigrade temperature.I've this code but the result shows 32 no matter what I enter. How come?
Dim intTemp As Integer Dim intResult As Integer ' calculation intResult = (1.8 * intTemp) + 32
The lesson exercise is to convert from both Cecilius and Fahrenheit using two sub procedures. I thought I had this one in the bag..seemed pretty easy when I was doing it but my calculations are always 0..
This includes two radio buttons one for F and one for C the tempature text box and the results lbl along with two buttons, convert and exit. (see attached screen clipping)
Option Explicit On Option Strict On Option Infer Off
How would I code a TryParse to get the input from customer from a textbox named Strands and convert it to a number (this number will always be a whole complete number, cannot be 5.6 or 4 1/2 or whatever) then have that Strand number be muliplied by the selected item in my listbox1. This listbox has an access database bound to it with 2 columns Size and Area, the Size equals the Area and I set the Value to the Area column but set the Size to show up in the list box. and the Strands textbox has to muliply by the Size picked, but by the Area # not the Size #. And the results of that multiplication showing up in another textbox named total.
I am trying to convert a DLL function call which has the Callback function routine called within the DLL function call.The DLL function call signature is like this:
I'm new to visual basic and have decided to make a temperature conversion program. I've attached a screenshot to aid in my description. The program reads the temperatures on the left(from text boxes), converts them, and displays the answers on the right in text boxes. The program has a fever check at the bottom which displays whether or not the converted values are a fever.
I've managed to get this to work no problem, but I'm trying to get it so if the user enters the temperatures directly into the "result" textboxes, that the fever check still works. Unfortunately I'm having no luck, the fever check will only display a message if the values have been converted, not directly entered by the user. Here is the code I tried(fever.Text is what is displayed in a textbox above the fever check button):
Private Sub FeverCheck_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FeverCheck.Click 'Turn string values entered into Decimal Values so they can be compared to decimal values Dim fahrfever As Decimal Dim Celsfever As Decimal 'The following two lines have problems when debugging [Code] .....
I am working on a school project to make a temperature converter that when fahrenheit is entered into textbox1 and then tabbed, the conversion to celsius, rankine, and kelvin is displayed in textbox 2,3, and 4.My instructor showed me how to input the code for this, but it isn't working correctly. I know I need more code to get this right but I am a newbie to programming and my instructor doesn't insruct very well. Can someone please tell me what I need to do to finish this coding? This is what I have so far: Public Class Form1
I am trying to check this app. and make sure only numbers are placed into the textbox, but my tryparse isn't working.
Private Sub btnConvertC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConvertC.Click Dim intTemp As Integer 'holds the text input If Integer.TryParse(txtTemp.Text, intTemp) Then
I have an array of 5 objects and also 5 textboxes. I am wanting to check to see if the values in the corresponding textbox are valid for the type of object.I have currently hard coded this, I parse out the object type and then use a tryparse statement depending on the object type.
Can I do this automatically? Can I detect the type and use a tryparse statement for that type. Maybe something like:if objectarray(x).tryparse(textbox(x).text, nothing)
I have become accustomed to using TryParse for attempting to parse unknown types:
Dim b As Boolean Dim qVal As Boolean = If(Boolean.TryParse(Request.QueryString("q").Trim(), b), b, False)
or
bool b; bool qVal = (Boolean.TryParse(Request.QueryString("q").Trim(), out b) ? b : false;
So, just curious if someone knows a better way of doing this other than using a ternary operator.
public static class PrimitiveType { /// This function will return a parsed value of the generic type specified. /// </summary>
[code]....
Just pass in the type you're expecting as the generic and provide a string value to be parsed and a default value in case the string is not parsable. If you provide a class instead of a primitive type it will throw new ArgumentException("Generic type must be a valid Value Type that has a Parse method.");
The adultcombobox & childcombobox have value from 1 to 10, and none.I try put it in Do Loop like the code below, but the total price not come up so well, so I think I am having problem with the Do Loop and the Payment method.One more thing, do I need to Tryparse the combobox and use the selectedIndex ?
I am in my programming class and we had a small program to make that would check to see if an value that was entered is a integer and convert it to a Roman numeral. I know how to properly do it by putting the TryParse into the If...Then statement. What I am trying to do is to not use an If...Then statement and go just by a Case Selection statement. If it is not possible then that is cool with me, I am just trying to think outside the box. Here is what i have done with it: [code]....
When you do say "Case 1" it says it needs to be "Case CBool(1)." Using either "Case CBool(1)" or "Case 1 = 1" provides the same result .However the code shows no errors it doesn't do the conversion, it always displays the label's value as "I"
this is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code. This is what I have for the calculate click event:
this is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code.This is what I have for the calculate click event:
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click Dim intInputA As Integer Dim intInputB As Integer Dim intInputC As Integer
[code]....
My Problem: I am using the Try parse to validate weather the inputA(B)(C) is an integer or not, if it is an integer, i want it to move to the nested if and validate that it is a positive number, and show the error message in the label if it is not. If it is not a number at all i want it to show another message in the label. The problem that I am getting is that even if i put in a letter for the input it does not catch it and it continues on to the select case, which comes out 0.
My understanding of the Integer.TryParse() function was that it tried to parse an integer from the passed in string and if the parse failed the result integer would remain as it did before.
I have an integer with a default value of -1 which I would like to remain at -1 if the parse fails. However the Integer.TryParse() function on failing to parse is changing this default value to zero.
Dim defaultValue As Integer = -1 Dim parseSuccess As Boolean = Integer.TryParse("", defaultValue) Debug.Print("defaultValue {0}", defaultValue) Debug.Print("parseSuccess {0}", parseSuccess)
On all my assignments I am asked to make sure the data is valid - only numeric, no empty strings. And I keep wondering which is the best to use IsNumeric or TryParse. When I try both on coding they seem to do the same thing, and I don't seem to find my answer online. Any ideas of why to use one over the other.
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