#208. count7
count7
Background
Description
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).
Format
Input
Output
Samples
717
2
7
1
123
0
Limitation
1s, 1024KiB for each test case.