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8. a) What are formal and actual arguments? Explain the concept of call by value and call by reference with examples.
b) Write a C program to swap two numbers using pointers.
9. a) What is a structure? How to declare and initialize a structure? Explain with an example.
b) Explain the difference between structures and unions.
(OR)
10. a) Explain different file handling functions in C with examples.
b) Write a C program to copy the contents of one file to another file.
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