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Exercise 2.8. Write a version of product (see Exercise 2.7) that uses a while loop instead of recursion. Draw a table that illustrates values of its variables during execution for a reasonable input. The loop of sum follows a common pattern that motivates the for loop: 1 int sum (int n, int * s) { int i; // check for malformed input if (n ; ; ) { ] 3 44 Chapter 2. Control is exactly the same as a while loop of the form while () { ] 5 Programmer preference dictates when to use a while statement and when to use a for statement. Readability is the goal. Exercise 2.7. Write a function to compute the product 1 x...xn, for pos- itive n. Write a main function to call it, and illustrate various interesting memory configurations during its execution. Use the protection and naming conventions of Exercise 2.6