Part A: RAPTOR program exercise:

a) Start RAPTOR and create a flowchart that asks the user to enter the first 12 digits of an ISBN-13, and displays the corresponding check digit.

b) Run the flowchart with different numbers.

c) Save the flowchart to a file named isbn.rap in the working directory on the PC you are using.

Part B: C programming exercise

a) Implement the algorithm as represented by isbn.rap, and write an equivalent C program that accomplishes what the flowchart does. The program, however, is allowed to call the scanf(...) function only once. A sample interaction is shown below:

Enter the first twelve digits of ISBN-13: 978030640615

Check digit: 7

b) Save your program to a file named isbn.c in the working directory on the PC you are using.

Hint: To read single digits, well use scanf with the %1d conversion specification.