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17.	What is the difference between structured oriented, object oriented and non structure oriented programming language?
	Structured oriented programming language: In this type of language, large programs are divided into small programs called functions. Prime focus is on functions and procedures that operate on data. Data moves freely around the system from one function to another. Program structure follows "Top down Approach" Example: C, Pascal, ALGOL and Modula-2. Object oriented programming language: In this type of language, programs are divided into objects. Prime focus is on the data that is being operated and not on the functions or procedures. Data is hidden and cannot be accessed by external functions. Program structure follows Bottom up Approach Example: C++, Java and C#. Non structure oriented programming language: There is no specific structure for programming this language. Example: BASIC, COBOL, FORTRAN
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18.	What is the difference between array and string in C?
	Array can hold any of the data types. But, string can hold only char data type. Array size must be a constant value. So, array size can't be changed once declared. But, string size can be modified using char pointer.
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19.	What is the starting index of an array?
	The starting index of an array is 0 (zero).
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20.	What is scanf()?
	scanf() function is an inbuilt library function in C which is available in C library by default. This function is declared and related macros are defined in "stdio.h" header file. scanf() function is used to read character, string, numeric data from keyboard.
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