An integer n is divisible by $9$ if the sums of its digits are divisible by $9.$ Develop a program to

determine if the number entered is divisible by $9.$ Starting with the rightmost digit use the

modulo operator to isolate each digit and in the process get the sum of the digits. After all

digits are added together determine if this number is divisible by $9.$ All numbers entered will

have $6$ digits. in C