Description
Return the least-significant zero-bit index.
Bit positions are usually counted from the least-significant bit, while a displayed binary string has its own left-to-right indexing convention. Masks, fields and parity predicates describe a selected region or pattern; local agreement does not validate a complete encoded record.
Return the least-significant zero-bit index.
When to use this tool
Use Lowest Zero Bit Index when checking the stated mask, field, parity or bit-index convention.
How to use the tool and how it works
- Enter wordDecimal, width. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read found, index. Inspect found before interpreting the associated values.
Return the least-significant zero-bit index. Require width 1..256 and bounded exact wordDecimal; scan from index zero upward, return found and index or -1 when all bits are one.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| wordDecimal | Word Decimal | Required. Text; maximum UTF-16 length 8192. Integer syntax: optional + or - and 1-128 decimal digits; leading zeros accepted. Apply the sign restriction above. |
| width | Width under the stated bit, interval or geometry convention; apply the field-specific units and bounds. | Required. Safe integer; minimum 1; maximum 256. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| found | Found | Required. Boolean. |
| index | Position under the explicit indexing convention; inspect any missing-value sentinel. | Required. Safe integer. |
{
"input": {
"wordDecimal": "11",
"width": 4
},
"output": {
"found": true,
"index": 2
}
}Limitations and assumptions
- Indexes are least-significant-first and ignore positions outside width; this is a bounded search, not complement arithmetic on an unbounded integer.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Choose an explicit bit order, word width and missing-position policy; use the complete record format and appropriate parsing or checksum methods for full validation.
References
Similar or alternative tools
- Gray Code Single Transition Bit Index
Check whether two words differ in exactly one bit.
- Bitwise: Bitmask Singleton Index Check
Return a singleton mask's bit index or a sentinel.