Description
Parse a signed decimal mantissa with optional e/E signed integer exponent.
Alignment requires a declared measure of width. ASCII token characters, supplied display-cell widths and actual rendered glyph widths are different, so a column budget is meaningful only under its stated convention.
Parse a signed decimal mantissa with optional e/E signed integer exponent.
When to use this tool
Use Mantissa Exponent Field Width when you need a supplied field-width or padding calculation.
How to use the tool and how it works
- Enter token. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read mantissaWidth, exponentWidth, exponentPresent. Inspect exponentPresent before interpreting the associated values.
Parse a signed decimal mantissa with optional e/E signed integer exponent. Return mantissa text length, exponent-field length excluding e/E, and exponent presence.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| token | Token | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| mantissaWidth | Mantissa Width | Required. Safe integer. |
| exponentWidth | Exponent sign/digit character count excluding e/E; zero if no exponent. | Required. Safe integer. |
| exponentPresent | Exponent Present | Required. Boolean. |
{
"input": {
"token": "-1.20e+03"
},
"output": {
"mantissaWidth": 5,
"exponentWidth": 3,
"exponentPresent": true
}
}Limitations and assumptions
- Lengths count ASCII token characters including signs and digits; they are not display-cell measurements or numeric precision. No exponent yields width zero.
- 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.
Alternative or Complementary methods
Measure text in the actual font, terminal or output environment when visual alignment matters. Account for encoding, combining marks, wide characters and locale rather than inferring display width from text length alone.
References
Similar or alternative tools
- Mantissa Sign Field Width
Accept auto, always, never or except-zero policy.
- Signed Exponent E Notation Token
Require a signed decimal mantissa, allowing .5 or 1., and append e or E plus the signed integer exponent, explicitly adding plus for nonnegative exponents.