Question: Write a C++ program that sums the digits of the product of two positive integers until the sum becomes a single digit. For example Input:

Write a C++ program that sums the digits of the product of two positive integers until the sum becomes a single digit.

For example

Input: 12, 32

Output: 6

Because: 12 x 32 = 384, 3 + 8 + 4 = 15 -> 1+5 = 6

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