To gain experience writing functions and using recursion.

1. Write a program three.c that takes in 3 user-input integers and checks whether or not the 3 integers form a valid triangle (no one side is longer than the sum of the other 2 sides). It should contain the following functions:

   • isTriangle(), which determines whether the integers form a valid triangle
   • triangleType(), which determines whether the triangle is equilateral (all sides are equal), isoceles (only 2 sides are equal), or scalene (no sides are equal) and prints a message as appropriate
   • sanitizedInput(), which ensures that the user-input integers are valid

2. Write a program palindrome.c using recursion to test if a word/phrase is a palindrome (something that reads the same if the letters are reversed, such as racecar).

In a text file assignment5.txt, answer the following questions:

1. What do each of the following mean? Include a description of the syntax or an example.

   • Passing by value:
   • Passing by reference:
   • Passing call-by-value

2. What is the function of the return statement in C?

3. What is the purpose of writing functions?

4. When would you use Call by Value and when would you use Call by Reference?

Please include your name and a description in a comment at the top of your code files. Please also include your name at the top of your assignment5.txt file.

All files must be submitted via GitHub by 10:10am 7/29.