1. Write a program to print the sum and product of digits of an integer.
2. Write a program to reverse a non-negative integer.
3. Write a program to compute the sum of the first n terms of: S = 1 - 2 + 3 - 4 + 5…
4. Write a function to find whether a given number is prime or not. Use it to generate prime numbers less than 100.
5. Write a function that checks whether a given string is a Palindrome or not.
6. Write a program to compute the factors of a given number.
7. Write a program to swap two numbers using a macro.
8. Write a program to print a triangle of stars (take number of lines from user).
9. Write a program to perform the following actions on a user-entered array:
   - Print even-valued elements
   - Print odd-valued elements
   - Calculate sum and average
   - Print maximum and minimum element
   - Remove duplicates
   - Print array in reverse order
10. Write a program that prints a table of occurrences of each alphabet in text entered as command line arguments.
11. Write a program that swaps two numbers using pointers.
12. Write a program where a function passes the address of two variables and alters their contents.
13. Write a program that takes the radius of a circle as input, passes it to a function that computes area and circumference, and displays the values from main().
14. Write a program to find the sum of n elements entered by the user using dynamic memory allocation (malloc/calloc or new).
15. Write a menu-driven program to perform the following string operations:
    - Show address of each character
    - Concatenate two strings without strcat
    - Concatenate two strings using strcat
    - Compare two strings
    - Calculate length using pointers
    - Convert to uppercase
    - Convert to lowercase
    - Count vowels
    - Reverse the string
16. Given two ordered arrays of integers, write a program to merge them into an ordered array.
17. Write a program to display Fibonacci series (i) using recursion, (ii) using iteration.
18. Write a program to calculate Factorial (i) using recursion, (ii) using iteration.
19. Write a program to calculate GCD of two numbers (i) with recursion, (ii) without recursion.
20. Write a menu-driven program for Matrix operations: a) Sum b) Difference c) Product d) Transpose.
21. Copy contents of one text file to another after removing all whitespaces.
22. Write a function that reverses elements of an array in place, accepting only one pointer value and returning void.
23. Write a program that reads 10 integers into an array (implemented using pointers) and prints elements in ascending and descending order.
24. Add two distances in a meter-kilometer system using structures.
25. Add two complex numbers using structures.
26. Calculate the difference between two time periods using structures.