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Given a non-negative int `n`

, return the count of the occurrences of 7 as a digit, so for example 717 yields 2. (no loops). Note that mod (...

Given a non-negative int `n`

, return the count of the occurrences of 7 as a digit, so for example 717 yields 2. (no loops). Note that mod (`%`

) by 10 yields the rightmost digit (126 % 10 is 6), while divide (/) by 10 removes the rightmost digit (126 / 10 is 12).

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