Binary or Ascii Text?

Hi, everyone. I got a question. How can I identify whether a file is a
binary file or an ascii text file? For instance, I wrote a piece of
code and saved as "Test.c". I knew it was an ascii text file. Then
after compilation, I got a "Test" file and it was a binary executable
file. The problem is, I know the type of those two files in my mind
because I executed the process of compilation, but how can I make the
computer know the type of a given file by writing code in C? Files are
all save as 0's and 1's. What's the difference?

Please help me, thanks.

.

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