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45.	How do you determine the length of a string value that was stored in a variable?
	To get the length of a string value, use the function strlen(). For example, if you have a variable named FullName, you can get the length of the stored string value by using this statement: I = strlen(FullName); the variable I will now have the character length of the string value.
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46.	Can variable name start with numbers?
	No. variable names can't start with numbers as per the variable naming rule.
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47.	What is the difference between functions getch() and getche()?
	Both functions will accept a character input values from the user. When using getch(), the key that was pressed will not appear on the screen, and is automatically captured and assigned to a variable. When using getche(), the key that was pressed by the user will appear on the screen, while at the same time being assigned to a variable.
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48.	Can we make our own library of functions?
	Yes. Different compilers provide different utilities to add/delete/modify functions in the standard library. For example Turbo C/C++ compilers provide a utility called TLIB.EXE. Using this utility we can also develop a completely new library.
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