Problem 2040. Additive persistence

Solution 1881392

Submitted on 22 Jul 2019 by Evan

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Test	Status	Code Input and Output
1	Pass	x = 1; y_correct = 0; assert(isequal(add_persistence(x),y_correct))
2	Pass	x=18; y_correct = 1; assert(isequal(add_persistence(x),y_correct))
3	Pass	x=2718; y_correct = 2; assert(isequal(add_persistence(x),y_correct))
4	Pass	x=199; y_correct = 3; assert(isequal(add_persistence(x),y_correct))
5	Pass	x=100; y_correct = 1; assert(isequal(add_persistence(x),y_correct))