C#•2mo ago

Learning please help me understand.

I am sure this is so simple for most of you finding this but I am struggling and I really just want to understand it. Help.

22 Replies

Keswiik•2mo ago

What part of this are you having trouble understanding?

StaynkOP•2mo ago

I understand what they’re asking me to do I just don’t know how to get there. I know it has to be a loop could I use a do-while loop? For example “do number -1” “while number >= 0”

Keswiik•2mo ago

what would happen in your do-while loop if the user entered 0 as a number?

StaynkOP•2mo ago

hmm It would go negative So adjust while number > 0 ?

Keswiik•2mo ago

try it and see

StaynkOP•2mo ago

lol fail

StaynkOP•2mo ago

Keswiik•2mo ago

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/arithmetic-operators#decrement-operator---

Arithmetic operators - C# reference

Learn about C# operators that perform multiplication, division, remainder, addition, and subtraction operations with numeric types.

Keswiik•2mo ago

read this

StaynkOP•2mo ago

the answer was —number 😎

Salman•2mo ago

you dont even need a do while loop there, a simple while loop will suffice such as :

 var x = 10;
while(x >=0) Console.WriteLine(x--);

 var x = 10;
while(x >=0) Console.WriteLine(x--);

Keswiik•2mo ago

if you want it to count down in real time, you'd want to look at https://learn.microsoft.com/en-us/dotnet/api/system.threading.thread.sleep?view=net-9.0 or https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task.delay?view=net-9.0 (the second would require you use an async main method, though)

StaynkOP•2mo ago

I like that too That may be too advanced me right now hahah I think the concept behind that was for me to use a ooop

Salman•2mo ago

btw it's better if you use the new api like:

if(int.TryParse(Console.ReadLine(),out var res)
//do something
else
//otherwise do something else

if(int.TryParse(Console.ReadLine(),out var res)
//do something
else
//otherwise do something else

in this way even if user inputs something other than an int , you would be able to gracefully handle that . note that code might need some adjustment but you get the idea

StaynkOP•2mo ago

I’m not understanding that I’m sorry I’m just learning

Salman•2mo ago

what TryParse does is that , it tries to parse a string into a number if that string is a valid number e.g "10" to 10 , however if the string isn't a valid number .eg acd it would return false but if it's true it would give you the parsed value that's in the above example res

StaynkOP•2mo ago

I see and when would you use that type of statement

Salman•2mo ago

when you want to parse a string to a number and you aren't sure if the string is in correct form or not like in this program, user could type anything on their console , in your Convert.ToInt32 code, if user inputs abcd, it would crash your program

StaynkOP•2mo ago

Ohhh I see Now that makes sense.

Salman•2mo ago

$close

MODiX•2mo ago

If you have no further questions, please use /close to mark the forum thread as answered

StaynkOP•2mo ago

Thank you.

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Learning please help me understand.

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