please write a program that take a character if character is small alphabet this program print same big alphabet and Inverse.then if numbers are between 0 until 9 this program prints the same...

Learn about how to input or output a character, and understand the methods IsLower, IsUpper, IsDigit, ToLower, ToUpper...

We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action.

Try it yourself, you may find it is not as difficult as you think!


"I am in terms of 1. and my teacher dosen't us basic of programming but he watnts us this questions : ((( thank you ..."

Ok. This is your homework, so I'll give you no code!

I am going to assume this is a Console App - if you haven't been told otherwise then it probably is.
I am also going to assume that you know how to create an empty Console Application.

There are two basic functions to need to look at:

Console.Write     - Output data to the console display.
Console.Read      - Read input from the console keyboard.

So start off simple: (And I will give you a bit of code after all:

Console.Write("Enter a character: ");
char c = (char)Console.Read();
Console.Write(c);

All that does is prompt you, read a character, and print it back out again.

Try it, and think: what do you need to do next?

First of all,We are not here to do your homework and try to practice in fields in which you think you are weak.
Further you can check these for help-
How to convert strings to lower, upper, or title (proper) case by using Visual C#[^]

and Google[^] is your complete globe for help.