The use of punctuation characters to separate subgroups in a number can make the number more readable. For instance consider 1,000,000,000 versus
1000000000. But when the grouping is irregular, such as 1,000,00,000; it indicates an error.
This rule raises an issue when underscores (_) are used to break a number into irregular subgroups.
Noncompliant code example
int thousand = 100_0;
int tenThousand = 100_00;
int million = 1_000_00_000;
Compliant solution
int thousand = 1000;
int tenThousand = 10_000;
int tenThousandWithout = 10000;
int duos = 1_00_00;
int million = 100_000_000;
