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What is the role of operating system? Why C is called structured programming language? Explain the term associativity and precedence of operator in C? Why GOTO is not used in modern programming style What is type casting? State the difference of type casting with example? What do you mean by data type? Explain the different type of data type? Differentiate between a)while and do while loop b) Break and continue with example 8) Explain local variable and global variable with example. State with difference between them 9) State the difference between pass by value and pass by address. Does C support pass by address? 10) Explain the different parts of function. What is meant by prototype? 11) What do you mean by malloc and calloc? State the difference between them. 12) What is meant by algorithm? State the basic features of algorithm? 13) What is preprocessor? State the difference between function and macro.