Name some operating systems which is written in C programming language.

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=> Who is the father of C language?
=> Which of the following is not a valid C variable name?
=> All keywords in C are in ........................
=> Which is valid C expression?
=> Which of the following cannot be a variable name in C?
=> What is short int in C programming?
=> Which of the following declaration is not supported by C language?
=> Which keyword is used to prevent any changes in the variable within a C program?
=> C preprocessors can have compiler specific features.
=> The C-preprocessors are specified with _________ symbol.