org.apache.poi.ss.util

Class NumberToTextConverter

java.lang.Object

org.apache.poi.ss.util.NumberToTextConverter

public final class NumberToTextConverter
extends Object

Excel converts numbers to text with different rules to those of java, so Double.toString(value) won't do.

• No more than 15 significant figures are output (java does 18).
• The sign char for the exponent is included even if positive
• Special values (NaN and Infinity) get rendered like the ordinary number that the bit pattern represents.
• Denormalised values (between ±2^-1074 and ±2^-1022 are displayed as "0"

IEEE 64-bit Double Rendering Comparison

Raw bits	Java	Excel
0x0000000000000000L	0.0	0
0x3FF0000000000000L	1.0	1
0x3FF00068DB8BAC71L	1.0001	1.0001
0x4087A00000000000L	756.0	756
0x401E3D70A3D70A3DL	7.56	7.56
0x405EDD3C07FB4C99L	123.45678901234568	123.456789012346
0x4132D687E3DF2180L	1234567.8901234567	1234567.89012346
0x3EE9E409302678BAL	1.2345678901234568E-5	1.23456789012346E-05
0x3F202E85BE180B74L	1.2345678901234567E-4	0.000123456789012346
0x3F543A272D9E0E51L	0.0012345678901234567	0.00123456789012346
0x3F8948B0F90591E6L	0.012345678901234568	0.0123456789012346
0x3EE9E409301B5A02L	1.23456789E-5	0.0000123456789
0x3E6E7D05BDABDE50L	5.6789012345E-8	0.000000056789012345
0x3E6E7D05BDAD407EL	5.67890123456E-8	5.67890123456E-08
0x3E6E7D06029F18BEL	5.678902E-8	0.00000005678902
0x2BCB5733CB32AE6EL	9.999999999999123E-98	9.99999999999912E-98
0x2B617F7D4ED8C59EL	1.0000000000001235E-99	1.0000000000001E-99
0x0036319916D67853L	1.2345678901234578E-307	1.2345678901235E-307
0x359DEE7A4AD4B81FL	2.0E-50	2E-50
0x41678C29DCD6E9E0L	1.2345678901234567E7	12345678.9012346
0x42A674E79C5FE523L	1.2345678901234568E13	12345678901234.6
0x42DC12218377DE6BL	1.2345678901234567E14	123456789012346
0x43118B54F22AEB03L	1.2345678901234568E15	1234567890123460
0x43E56A95319D63E1L	1.2345678901234567E19	12345678901234600000
0x441AC53A7E04BCDAL	1.2345678901234568E20	1.23456789012346E+20
0xC3E56A95319D63E1L	-1.2345678901234567E19	-12345678901234600000
0xC41AC53A7E04BCDAL	-1.2345678901234568E20	-1.23456789012346E+20
0x54820FE0BA17F46DL	1.2345678901234577E99	1.2345678901235E+99
0x54B693D8E89DF188L	1.2345678901234576E100	1.2345678901235E+100
0x4A611B0EC57E649AL	2.0E50	2E+50
0x7FEFFFFFFFFFFFFFL	1.7976931348623157E308	1.7976931348623E+308
0x0010000000000000L	2.2250738585072014E-308	2.2250738585072E-308
0x000FFFFFFFFFFFFFL	2.225073858507201E-308	0
0x0000000000000001L	4.9E-324	0
0x7FF0000000000000L	Infinity	1.7976931348623E+308
0xFFF0000000000000L	-Infinity	1.7976931348623E+308
0x441AC7A08EAD02F2L	1.234999999999999E20	1.235E+20
0x40FE26BFFFFFFFF9L	123499.9999999999	123500
0x3E4A857BFB2F2809L	1.234999999999999E-8	0.00000001235
0x3BCD291DEF868C89L	1.234999999999999E-20	1.235E-20
0x444B1AE4D6E2EF4FL	9.999999999999999E20	1E+21
0x412E847FFFFFFFFFL	999999.9999999999	1000000
0x3E45798EE2308C39L	9.999999999999999E-9	0.00000001
0x3C32725DD1D243ABL	9.999999999999999E-19	0.000000000000000001
0x3BFD83C94FB6D2ABL	9.999999999999999E-20	1E-19
0xC44B1AE4D6E2EF4FL	-9.999999999999999E20	-1E+21
0xC12E847FFFFFFFFFL	-999999.9999999999	-1000000
0xBE45798EE2308C39L	-9.999999999999999E-9	-0.00000001
0xBC32725DD1D243ABL	-9.999999999999999E-19	-0.000000000000000001
0xBBFD83C94FB6D2ABL	-9.999999999999999E-20	-1E-19
0xFFFF0420003C0000L	NaN	3.484840871308E+308
0x7FF8000000000000L	NaN	2.6965397022935E+308
0x7FFF0420003C0000L	NaN	3.484840871308E+308
0xFFF8000000000000L	NaN	2.6965397022935E+308
0xFFFF0AAAAAAAAAAAL	NaN	3.4877119413344E+308
0x7FF80AAAAAAAAAAAL	NaN	2.7012211948322E+308
0xFFFFFFFFFFFFFFFFL	NaN	3.5953862697246E+308
0x7FFFFFFFFFFFFFFFL	NaN	3.5953862697246E+308
0xFFF7FFFFFFFFFFFFL	NaN	2.6965397022935E+308

Note: Excel has inconsistent rules for the following numeric operations:

• Conversion to string (as handled here)
• Rendering numerical quantities in the cell grid.
• Conversion from text
• General arithmetic

Excel's text to number conversion is not a true inverse of this operation. The allowable ranges are different. Some numbers that don't correctly convert to text actually do get handled properly when used in arithmetic evaluations.

Method Summary

Modifier and Type	Method and Description
static String	toText(double value) Converts the supplied value to the text representation that Excel would give if the value were to appear in an unformatted cell, or as a literal number in a formula. Note - the results from this method differ slightly from those of Double.toString() In some special cases Excel behaves quite differently.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

toText

public static String toText(double value)

Converts the supplied value to the text representation that Excel would give if the value were to appear in an unformatted cell, or as a literal number in a formula.
Note - the results from this method differ slightly from those of Double.toString() In some special cases Excel behaves quite differently. This function attempts to reproduce those results.