Write in C. NOT C++.

COULD STEP COMMENTS BE ADDED AS WELL AS A SAMPLE OUTPUT

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For two extra points test the validity of the ISBN number by the Sum of Sums method Sum of Sums: In this method the original ISBN array is used again. A second array is created by adding each digit of the ISBN array to the sum of the previous digits. A third array is the sum of the previous sums. The ISBN number is valid if the sum of the sums modulus 11 is 0. An example is shown be low 2. Write a program to test an ISBN number to see if it is valid using the weighted sum method Weighted sum method: Declare two arrays with ten elements each. Enter the 10 digits of an ISBN number in one array, one digit in each array slot. In the second array enter weighting factors from 10 to 1 as shown in the table below. You may choose to have a third array with weighted values (products of corresponding elements of the other two arrays. The ISBN number is valid if the sum of the weighted values modulus 11 is 0. An example is shown in the table below for ISBN number 0078818095 Table2. Sum of Sums Method for ISBN Validity Test Problem adapter from Computer Science A Structured Pro- 56 amming Approach Using C by Forouzan & Gilberg End of document Table 1. Weighted Sum Method for ISBN Validity Test