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Check whether input is a nonnegative integer
Reject empty input and nonnumeric characters before arithmetic.
validation✓ Tested
Convert a duration to hours and minutes
Python: Use divmod to split nonnegative whole seconds into display components.
Python✓ Tested
Count day boundaries between dates
Compare date values with DATEDIFF.
DATEDIFF✓ Tested
Read a file line by line
Read C++ text lines without loading the whole file at once.
C++✓ Tested
Set consistent widths for table columns
HTML: A colgroup applies presentation to whole columns without repeating styles on every cell.
HTML✓ Tested
Sum values per category
Calculate a grouped total.
SUM✓ Tested