Unit 3: Input and Output Operations Notes

• Which of the following is an invalid variable name in C? (a) _salary (b) 1st_rank (c) total_sum (d) age2objective · 1 marks
• What is the return type of the `malloc()` function in C? (a) `int*` (b) `char*` (c) `void*` (d) `float*`objective · 1 marks
• Explain the difference between call by value and call by reference in C with suitable code snippets.short · 5 marks
• What is recursion? Write a recursive function in C to calculate the factorial of a positive integer.short · 5 marks
• Explain dynamic memory allocation in C. Differentiate between `malloc()` and `calloc()`. Write a C program to dynamically allocate memory for N integers, sort them in ascending order, and free the memory.long · 10 marks

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