Write a C++ program to find the Fibonacci series up to N terms, where N is a user-defined positive integer.

Implement a C++ program to reverse a given integer.

Create a C++ program that counts the number of words in a user-entered sentence.

Write a C++ program to find the largest and smallest elements in an array of integers.

Implement a C++ program to check if a string is a palindrome (reads the same forwards and backward) ignoring spaces and punctuation.

Create a C++ program that calculates the factorial of a given number using a loop.

Write a C++ program that performs basic arithmetic operations (addition, subtraction, multiplication, and division) based on user input.

Implement a C++ program that simulates a simple calculator with functions for addition, subtraction, multiplication, and division.