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36.	What is calling a function?
	A function can be called or invoked from another function by using its name. The function name may include a set of actual parameters, enclosed in parenthesis separated by comma.
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37.	What are the advantageous of functions?
	Functions are advantageous as they Reduce the size of the program. Induce reusability of code. Reusability of code (function fact is executed more than once). A function can be shared by other programs by compiling it separately and loading them together.
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38.	What are functions?
	Functions are the building blocks of C++ programs. Functions are also the executable segments in a program. The starting point for the execution of a program is main ().
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39.	When are the variables to be declared?
	Declaration statement variables need to be declared and defined before they are used in a program. Declaration of a variable introduces a variable's name and its associated data type.
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40.	What is the use of declaration statements?
	Declaration statements are used to declare user defined data type identifiers, function headers, pointer variables and the like.
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