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C > 06. Advanced Functions

1. A Function with Two Results
   This program shows a function that generates two results. One result is returned, the other accessed from the main via an address.
2. The bigger2 Function: Using Pointer Arguments
   This function returns nothing but will change the value of the variable in the calling function's memory area.
3. The Prime Numbers Function
   A function that determines if a number is prime or not. The function returs 1 if prime, 0 if not. In addition, the function will "return" the value of one of the divisors.
4. The Divisors Program
   A program that prints all the smallest divisors of the integers between 1 and 50 and indicates prime numbers with and asterisk.
5. The double_triple Function: Two Results by Reference
   A function that takes in an integer number and "returns" both twice the number and three times the number.
6. The separate Function: Multiple Results by Reference
   A function that takes a real number and splits it into three parts: a sign (character), a whole part (integer) and a fraction (double).
7. The readex Function: Two results from a scanf
   A simple addition reader/parser for 2 doubles.
8. The multiply Function: Using Recursion
   A function that multiplies two integers without using the multiplication (*) operator.
9. The evaluate Function
   A function that gets the results of another function with different argument values. Uses a function as a parameter.
10. The Function Roots Program
    A program finding function roots using the bisection method.
11. The Fraction Evaluation Function
    A function that evaluates a fraction specified as a numerator and denominator.
12. The Swap Numbers Function
    A void function that swaps two numbers depending on their values.
13. The Factorial Function (Recursive)
    A recursive version of a function that calculates the factorial on an integer number.
14. The Recursive Fibonacci Function
    A recursive version of a function that returns the nth number in the Fibonacci sequence.
15. The Recursive GCD Function
    A recursive function that finds the greatest common divisor of two integer numbers.
16. The find_caps Function
    A recursive function that extracts capital letters from a string and puts them into another string.
17. The select_sort Function
    A recursive that sorts and array of integers in ascending order.

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