How do I get whole and fractional parts from double in JSP Java

Question

How do I get whole and fractional parts from double in JSP Java   If the value is 3 25 then I want to get fractional   25  whole   3  How can we do this in Java

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http   www java2s com Code Java Data-Type Obtainingtheintegerandfractionalparts htm  double num  long iPart  double fPart      Get user input num   2 3d  iPart    long  num  fPart   num - iPart  System out println  Integer part       iPart   System out println  Fractional part       fPart     Outputs   Integer part   2 Fractional part   0 2999999999999998

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Since this 1-year old question was kicked up by someone who corrected the question subject  and this question is been tagged with jsp  and nobody here was able to give a JSP targeted answer  here is my JSP-targeted contribution   Use JSTL  just drop jstl-1 2 jar in  WEB-INF lib  fmt taglib  There s a  lt fmt formatNumber gt  tag which does exactly what you want and in a quite easy manner with help of maxFractionDigits and maxIntegerDigits attributes    Here s an SSCCE  just copy n paste n run it    lt    taglib uri  http   java sun com jsp jstl fmt  prefix  fmt    gt    lt          Just for quick prototyping  Don t do this in real  Use servlet javabean      double d   3 25      request setAttribute  d   d     gt    lt  doctype html gt   lt html lang  en  gt       lt head gt           lt title gt SO question 343584 lt  title gt       lt  head gt       lt body gt           lt p gt Whole   lt fmt formatNumber value    d   maxFractionDigits  0    gt           lt p gt Fraction   lt fmt formatNumber value    d   maxIntegerDigits  0    gt       lt  body gt   lt  html gt    Output      Whole  3      Fraction   25   That s it  No need to massage it with help of raw Java code

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The mantissa and exponent of an IEEE double floating point number are the values such that  value   sign    1   mantissa    pow 2  exponent    if the mantissa is of the form 0 101010101 base 2  ie its most sigificant bit is shifted to be after the binary point  and the exponent is adjusted for bias   Since 1 6  java lang Math also provides a direct method to get the unbiased exponent  called getExponent double     However  the numbers you re asking for are the integral and fractional parts of the number  which can be obtained using  integral   Math floor x  fractional   x - Math floor x    though you may you want to treat negative numbers differently  floor -3 5     -4 0   depending why you want the two parts   I d strongly suggest that you don t call these mantissa and exponent

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double value   3 25  double fractionalPart   value   1  double integralPart   value - fractionalPart

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Integer part gets from simple casting and for fractional - string splitting   double value   123 004567890  int integerPart    int  value     123  int fractionPart      Integer valueOf String valueOf value         split      1       004567890        To control zeroes omitted from start after parsing     int decimals     String valueOf value         split      1  length       9

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Integer part gets from simple casting and for fractional - string splitting   double value   123 004567890  int integerPart    int  value     123  int fractionPart      Integer valueOf String valueOf value         split      1       004567890        To control zeroes omitted from start after parsing     int decimals     String valueOf value         split      1  length       9

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I would use BigDecimal for the solution  Like this       double value   3 25      BigDecimal wholeValue   BigDecimal valueOf value  setScale 0  BigDecimal ROUND DOWN       double fractionalValue   value - wholeValue doubleValue

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Main logic you have to first find how many digits are there after the decimal point   This code works for any number upto 16 digits  If you use BigDecimal you can run it just for upto 18 digits  put the input value  your number  to the variable  num   here as an example i have hard coded it   double num  temp 0  double frac j 1   num 1034 235     FOR THE FRACTION PART do  j j 10  temp  num j   while  temp 10   0           j j 10  temp  int num  frac  num j - temp j    System out println  Double number    num         System out println  Whole part     int num   fraction part     int frac

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Main logic you have to first find how many digits are there after the decimal point   This code works for any number upto 16 digits  If you use BigDecimal you can run it just for upto 18 digits  put the input value  your number  to the variable  num   here as an example i have hard coded it   double num  temp 0  double frac j 1   num 1034 235     FOR THE FRACTION PART do  j j 10  temp  num j   while  temp 10   0           j j 10  temp  int num  frac  num j - temp j    System out println  Double number    num         System out println  Whole part     int num   fraction part     int frac

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The original question asked for the exponent and mantissa  rather than the fractional and whole part   To get the exponent and mantissa from a double you can convert it into the IEEE 754 representation and extract the bits like this   long bits   Double doubleToLongBits 3 25    boolean isNegative    bits  amp  0x8000000000000000L     0   long exponent         bits  amp  0x7ff0000000000000L   gt  gt  52  long mantissa         bits  amp  0x000fffffffffffffL

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The mantissa and exponent of an IEEE double floating point number are the values such that  value   sign    1   mantissa    pow 2  exponent    if the mantissa is of the form 0 101010101 base 2  ie its most sigificant bit is shifted to be after the binary point  and the exponent is adjusted for bias   Since 1 6  java lang Math also provides a direct method to get the unbiased exponent  called getExponent double     However  the numbers you re asking for are the integral and fractional parts of the number  which can be obtained using  integral   Math floor x  fractional   x - Math floor x    though you may you want to treat negative numbers differently  floor -3 5     -4 0   depending why you want the two parts   I d strongly suggest that you don t call these mantissa and exponent

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What if your number is 2 39999999999999  I suppose you want to get the exact decimal value  Then use BigDecimal   Integer x y intPart  BigDecimal bd bdInt bdDec  bd   new BigDecimal  2 39999999999999    intPart   bd intValue    bdInt   new BigDecimal intPart   bdDec   bd subtract bdInt   System out println  Number       bd   System out println  Whole number part       bdInt   System out println  Decimal number part       bdDec

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OK this is maybe late  but i think the best and more accurate approach is using BigDecimal  double d   11 38   BigDecimal bigD   BigDecimal valueOf d   int intPart   bigD intValue    double fractionalPart   bigD subtract BigDecimal valueOf intPart   doubleValue     System out println intPart      11 System out println fractionalPart      0 38

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Don t know if this is faster but I m using  float fp   ip   1 0f

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Since Java 8  you can use Math floorDiv   It returns the largest  closest to positive infinity  int value that is less than or equal to the algebraic quotient   Some examples   floorDiv 4  3     1 floorDiv -4  3     -2   Alternatively  the   operator can be used    4   3     1  -4   3     -1   References    Java 8   Math floorDiv int int  Java 8   Math floorDiv long long

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String value    3 06    if  value isEmpty         if value contains                    String block   value substring 0 value indexOf                System out println block        else          System out println value

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Edit  The question originally asked how to get the mantissa and exponent    Where n is the number to get the real mantissa exponent   exponent   int log n   mantissa   n   10 exponent   Or  to get the answer you were looking for   exponent   int n  mantissa   n - exponent   These are not Java exactly but should be easy to convert

User · Answer

Since this 1-year old question was kicked up by someone who corrected the question subject  and this question is been tagged with jsp  and nobody here was able to give a JSP targeted answer  here is my JSP-targeted contribution   Use JSTL  just drop jstl-1 2 jar in  WEB-INF lib  fmt taglib  There s a  lt fmt formatNumber gt  tag which does exactly what you want and in a quite easy manner with help of maxFractionDigits and maxIntegerDigits attributes    Here s an SSCCE  just copy n paste n run it    lt    taglib uri  http   java sun com jsp jstl fmt  prefix  fmt    gt    lt          Just for quick prototyping  Don t do this in real  Use servlet javabean      double d   3 25      request setAttribute  d   d     gt    lt  doctype html gt   lt html lang  en  gt       lt head gt           lt title gt SO question 343584 lt  title gt       lt  head gt       lt body gt           lt p gt Whole   lt fmt formatNumber value    d   maxFractionDigits  0    gt           lt p gt Fraction   lt fmt formatNumber value    d   maxIntegerDigits  0    gt       lt  body gt   lt  html gt    Output      Whole  3      Fraction   25   That s it  No need to massage it with help of raw Java code

User · Answer

Edit  The question originally asked how to get the mantissa and exponent    Where n is the number to get the real mantissa exponent   exponent   int log n   mantissa   n   10 exponent   Or  to get the answer you were looking for   exponent   int n  mantissa   n - exponent   These are not Java exactly but should be easy to convert

User · Answer

Edit  The question originally asked how to get the mantissa and exponent    Where n is the number to get the real mantissa exponent   exponent   int log n   mantissa   n   10 exponent   Or  to get the answer you were looking for   exponent   int n  mantissa   n - exponent   These are not Java exactly but should be easy to convert

User · Answer

The mantissa and exponent of an IEEE double floating point number are the values such that  value   sign    1   mantissa    pow 2  exponent    if the mantissa is of the form 0 101010101 base 2  ie its most sigificant bit is shifted to be after the binary point  and the exponent is adjusted for bias   Since 1 6  java lang Math also provides a direct method to get the unbiased exponent  called getExponent double     However  the numbers you re asking for are the integral and fractional parts of the number  which can be obtained using  integral   Math floor x  fractional   x - Math floor x    though you may you want to treat negative numbers differently  floor -3 5     -4 0   depending why you want the two parts   I d strongly suggest that you don t call these mantissa and exponent

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target float point number double d   3 025      transfer the number to string DecimalFormat df   new DecimalFormat    df setDecimalSeparatorAlwaysShown false   String format   df format d       split the number into two fragments int dotIndex   format indexOf       int iPart   Integer parseInt format substring 0  dotIndex       output  3 double fPart   Double parseDouble format substring dotIndex       output  0 025

User · Answer

Edit  The question originally asked how to get the mantissa and exponent    Where n is the number to get the real mantissa exponent   exponent   int log n   mantissa   n   10 exponent   Or  to get the answer you were looking for   exponent   int n  mantissa   n - exponent   These are not Java exactly but should be easy to convert

User · Answer

The original question asked for the exponent and mantissa  rather than the fractional and whole part   To get the exponent and mantissa from a double you can convert it into the IEEE 754 representation and extract the bits like this   long bits   Double doubleToLongBits 3 25    boolean isNegative    bits  amp  0x8000000000000000L     0   long exponent         bits  amp  0x7ff0000000000000L   gt  gt  52  long mantissa         bits  amp  0x000fffffffffffffL

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The accepted answer don t work well for negative numbers between -0 and -1 0 Also give the fractional part negative   For example   For number -0 35   returns  Integer part   0 Fractional part   -0 35  If wou are working with GPS coordinates it is better to have a result with the signum on the integer part as   Integer part   -0  Fractional part   0 35   Theses  numbers are used for example for GPS coordinates  where are important the signum for Lat or Long position  Propose code       double num      double iPart      double fPart          Get user input     num   -0 35d      iPart    long  num        Correct numbers between -0 0 and -1 0     iPart    num lt  -0 0000001  amp  amp  num gt -1 0   -iPart   iPart       fPart   Math abs num - iPart       System out println String format  Integer part    01 0f  iPart        System out println String format  Fractional part    01 04f  fPart      Output   Integer part   -0 Fractional part   0 3500

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A lot of these answers have horrid rounding errors because they re casting numbers from one type to another   How about   double x 123 456  double fractionalPart   x-Math floor x   double wholePart   Math floor x

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I would use BigDecimal for the solution  Like this       double value   3 25      BigDecimal wholeValue   BigDecimal valueOf value  setScale 0  BigDecimal ROUND DOWN       double fractionalValue   value - wholeValue doubleValue

User · Answer

The mantissa and exponent of an IEEE double floating point number are the values such that  value   sign    1   mantissa    pow 2  exponent    if the mantissa is of the form 0 101010101 base 2  ie its most sigificant bit is shifted to be after the binary point  and the exponent is adjusted for bias   Since 1 6  java lang Math also provides a direct method to get the unbiased exponent  called getExponent double     However  the numbers you re asking for are the integral and fractional parts of the number  which can be obtained using  integral   Math floor x  fractional   x - Math floor x    though you may you want to treat negative numbers differently  floor -3 5     -4 0   depending why you want the two parts   I d strongly suggest that you don t call these mantissa and exponent

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public class MyMain2       public static void main String   args            double myDub          myDub 1234 5678          long myLong          myLong  int myDub          myDub  myDub 1  10000          int myInt  int myDub          System out println myLong     n    myInt

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String value    3 06    if  value isEmpty         if value contains                    String block   value substring 0 value indexOf                System out println block        else          System out println value

User · Answer

Since Java 8  you can use Math floorDiv   It returns the largest  closest to positive infinity  int value that is less than or equal to the algebraic quotient   Some examples   floorDiv 4  3     1 floorDiv -4  3     -2   Alternatively  the   operator can be used    4   3     1  -4   3     -1   References    Java 8   Math floorDiv int int  Java 8   Math floorDiv long long

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double value   3 25  double fractionalPart   value   1  double integralPart   value - fractionalPart

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What if your number is 2 39999999999999  I suppose you want to get the exact decimal value  Then use BigDecimal   Integer x y intPart  BigDecimal bd bdInt bdDec  bd   new BigDecimal  2 39999999999999    intPart   bd intValue    bdInt   new BigDecimal intPart   bdDec   bd subtract bdInt   System out println  Number       bd   System out println  Whole number part       bdInt   System out println  Decimal number part       bdDec

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double value   3 25  double fractionalPart   value   1  double integralPart   value - fractionalPart

User · Answer

Don t know if this is faster but I m using  float fp   ip   1 0f

User · Answer

A lot of these answers have horrid rounding errors because they re casting numbers from one type to another   How about   double x 123 456  double fractionalPart   x-Math floor x   double wholePart   Math floor x

User · Answer

The original question asked for the exponent and mantissa  rather than the fractional and whole part   To get the exponent and mantissa from a double you can convert it into the IEEE 754 representation and extract the bits like this   long bits   Double doubleToLongBits 3 25    boolean isNegative    bits  amp  0x8000000000000000L     0   long exponent         bits  amp  0x7ff0000000000000L   gt  gt  52  long mantissa         bits  amp  0x000fffffffffffffL

User · Answer

The original question asked for the exponent and mantissa  rather than the fractional and whole part   To get the exponent and mantissa from a double you can convert it into the IEEE 754 representation and extract the bits like this   long bits   Double doubleToLongBits 3 25    boolean isNegative    bits  amp  0x8000000000000000L     0   long exponent         bits  amp  0x7ff0000000000000L   gt  gt  52  long mantissa         bits  amp  0x000fffffffffffffL

User · Answer

OK this is maybe late  but i think the best and more accurate approach is using BigDecimal  double d   11 38   BigDecimal bigD   BigDecimal valueOf d   int intPart   bigD intValue    double fractionalPart   bigD subtract BigDecimal valueOf intPart   doubleValue     System out println intPart      11 System out println fractionalPart      0 38

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double value   3 25  double fractionalPart   value   1  double integralPart   value - fractionalPart

User · Answer

The accepted answer don t work well for negative numbers between -0 and -1 0 Also give the fractional part negative   For example   For number -0 35   returns  Integer part   0 Fractional part   -0 35  If wou are working with GPS coordinates it is better to have a result with the signum on the integer part as   Integer part   -0  Fractional part   0 35   Theses  numbers are used for example for GPS coordinates  where are important the signum for Lat or Long position  Propose code       double num      double iPart      double fPart          Get user input     num   -0 35d      iPart    long  num        Correct numbers between -0 0 and -1 0     iPart    num lt  -0 0000001  amp  amp  num gt -1 0   -iPart   iPart       fPart   Math abs num - iPart       System out println String format  Integer part    01 0f  iPart        System out println String format  Fractional part    01 04f  fPart      Output   Integer part   -0 Fractional part   0 3500

User · Answer

Since the fmt formatNumber tag doesn t always yield the correct result  here is another JSP-only approach  It just formats the number as string and does the rest of the computation on the string  since that is easier and doesn t involve further floating point arithmetics    lt    taglib uri  http   java sun com jsp jstl core  prefix  c    gt   lt    taglib uri  http   java sun com jsp jstl functions  prefix  fn    gt    lt     double   numbers     0 0  3 25  3 75  3 5  2 5  -1 5  -2 5      pageContext setAttribute  numbers   numbers     gt    lt html gt     lt body gt       lt ul gt         lt c forEach var  n  items    numbers   gt           lt li gt   n      fn substringBefore n            n - fn substringBefore n        lt  li gt         lt  c forEach gt       lt  ul gt     lt  body gt   lt  html gt

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public class MyMain2       public static void main String   args            double myDub          myDub 1234 5678          long myLong          myLong  int myDub          myDub  myDub 1  10000          int myInt  int myDub          System out println myLong     n    myInt

User · Answer

Since the fmt formatNumber tag doesn t always yield the correct result  here is another JSP-only approach  It just formats the number as string and does the rest of the computation on the string  since that is easier and doesn t involve further floating point arithmetics    lt    taglib uri  http   java sun com jsp jstl core  prefix  c    gt   lt    taglib uri  http   java sun com jsp jstl functions  prefix  fn    gt    lt     double   numbers     0 0  3 25  3 75  3 5  2 5  -1 5  -2 5      pageContext setAttribute  numbers   numbers     gt    lt html gt     lt body gt       lt ul gt         lt c forEach var  n  items    numbers   gt           lt li gt   n      fn substringBefore n            n - fn substringBefore n        lt  li gt         lt  c forEach gt       lt  ul gt     lt  body gt   lt  html gt

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target float point number double d   3 025      transfer the number to string DecimalFormat df   new DecimalFormat    df setDecimalSeparatorAlwaysShown false   String format   df format d       split the number into two fragments int dotIndex   format indexOf       int iPart   Integer parseInt format substring 0  dotIndex       output  3 double fPart   Double parseDouble format substring dotIndex       output  0 025

[java] How do I get whole and fractional parts from double in JSP/Java?

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