leading zero
Leftmost null numeral
A leading zero is a zero that appears before other digits in a number, serving as a placeholder rather than indicating value.
In everyday arithmetic, leading zeros are meaningless—007 equals 7.
But in many contexts they matter: ZIP codes like 02134 require the leading zero, phone numbers preserve them, and formatted data often demands fixed-width numbers: The file names run from 001 to 999.
In programming, a leading zero sometimes signals a different number base, particularly octal.
- paddedFilled with soft material
- placeholderTemporary position marker
- formatArrangement and presentation style
- number formatWay digits are displayed
- digitSingle numeric character
prefix · binary · numeric · string · padding · decimal · integer · code · fill · alignment · timestamp · zipcode · counter · display · data entry · phone number · credit card · zip code
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