How do I create a menu in C to select the difficulty for a game

Why does there have to be a switch/case statement? If numbers are entered then they determine the size for everything in the game. The board area would either have to be allocated dynamically or you define a maximum size and make everything that big. For example, say you make 32 the maximum dimension size. Define a board variable type of int that is 32x32. You just make all your loops extended only as far as they need to for the current board size. Also - Mr. Griff's idea of the unused board boundary is a very good one and I would definitely use it. As previously mentioned, if you fix the board to 32x32 then you will have a usable board size of 30x30 so that would be the maximum size you allow the user to enter.

I just realized that I was assuming the user entered the actual size and not a level of difficulty. You could provide both if you wanted to. You could have easy, medium, hard, and user-defined as your possibilities. As for a switch/case statement - there are four cases and only two variables to assign in each case (board size and bomb count) and I think that's pretty easy.

If this is a console application, fgets( stdin, ... ) can be used to read lines of input from the user and atoi can convert the input into an integer. Both functions have tchar and wchar equivalents.

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i know i can use switch case but the code is too large. is there anyway to run a certain project in code blocks from an another project? because that would totally solve my problem.

Even if your project was 100 times larger, it wouldn't be too large.
The difference between each level of difficulty is the size of minefield and number of mines, there is no way you need a second project for this.

When you really want to write a minesweeper game the language C isnt the best, because some graphic element with an elegant GUI would be a better result. So C++ with some framework like MFC or Gt or C# would leed to nicer results, because the have big libraries like for string handling, painting beautiful graphics and UI elements.

If you really want to use C than you should structure and design your code. I have provided some of my experiences and knowledge in the article How to start the homework.