How do you round a number to two decimal places in C

Question

I want to do this using the Math Round function

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You should be able to specify the number of digits you want to round to using Math Round YourNumber  2   You can read more here

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string a    10 65678    decimal d   Math Round Convert ToDouble a ToString    2

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If you want to round a number  you can obtain different results depending on  how you use the Math Round   function  if for a round-up or round-down   you re working with doubles and or floats numbers  and you apply the midpoint rounding  Especially  when using with operations inside of it or the variable to round comes from an operation  Let s say  you want to multiply these two numbers  0 75   0 95   0 7125  Right  Not in C   Let s see what happens if you want to round to the 3rd decimal   double result   0 75d   0 95d     result   0 71249999999999991 double result   0 75f   0 95f     result   0 71249997615814209  result   Math Round result  3  MidpointRounding ToEven      result   0 712  Ok result   Math Round result  3  MidpointRounding AwayFromZero      result   0 712  Should be 0 713   As you see  the first Round   is correct if you want to round down the midpoint  But the second Round   it s wrong if you want to round up   This applies to negative numbers   double result   -0 75   0 95     result   -0 71249999999999991 result   Math Round result  3  MidpointRounding ToEven      result   -0 712  Ok result   Math Round result  3  MidpointRounding AwayFromZero      result   -0 712  Should be -0 713   So  IMHO  you should create your own wrap function for Math Round   that fit your requirements  I created a function in which  the parameter  roundUp true  means to round to next greater number  That is  0 7125 rounds to 0 713 and -0 7125 rounds to -0 712  because -0 712   -0 713   This is the function I created and works for any number of decimals   double Redondea double value  int precision  bool roundUp   true        if   decimal value    0 0m          return 0 0       double corrector   1   Math Pow 10  precision   2        if   decimal value  lt  0 0m                if  roundUp              return Math Round value  precision  MidpointRounding ToEven           else             return Math Round value - corrector  precision  MidpointRounding AwayFromZero             else               if  roundUp              return Math Round value   corrector  precision  MidpointRounding AwayFromZero           else             return Math Round value  precision  MidpointRounding ToEven             The variable   corrector  is for fixing the inaccuracy of operating with floating or double numbers

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You should be able to specify the number of digits you want to round to using Math Round YourNumber  2   You can read more here

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One thing you may want to check is the Rounding Mechanism of Math Round   http   msdn microsoft com en-us library system midpointrounding aspx  Other than that  I recommend the Math Round inputNumer  numberOfPlaces  approach over the  100 100 one because it s cleaner

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Personally I never round anything  Keep it as resolute as possible  since rounding is a bit of a red herring in CS anyway  But you do want to format data for your users  and to that end  I find that string Format   0 0 00    number  is a good approach

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Here s some examples   decimal a   1 994444M   Math Round a  2     returns 1 99  decimal b   1 995555M   Math Round b  2     returns 2 00   You might also want to look at bankers rounding   round-to-even with the following overload   Math Round a  2  MidpointRounding ToEven     There s more information on it here

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Wikipedia has a nice page on rounding in general   All  NET  managed  languages can use any of the common language run time s  the CLR  rounding mechanisms   For example  the Math Round    as mentioned above  method allows the developer to specify the type of rounding  Round-to-even or Away-from-zero   The Convert ToInt32   method and its variations use round-to-even   The Ceiling   and Floor   methods are related   You can round with custom numeric formatting as well   Note that Decimal Round   uses a different method than Math Round     Here is a useful post on the banker s rounding algorithm  See one of Raymond s humorous posts here about rounding

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Had a weird situation where I had a decimal variable  when serializing 55 50 it always sets default value mathematically as 55 5  But whereas  our client system is seriously expecting 55 50 for some reason and they definitely expected decimal  Thats when I had write the below helper  which always converts any decimal value padded to 2 digits with zeros instead of sending a string   public static class DecimalExtensions       public static decimal WithTwoDecimalPoints this decimal val                return decimal Parse val ToString  0 00               Usage should be  var sampleDecimalValueV1   2 5m  Console WriteLine sampleDecimalValueV1 WithTwoDecimalPoints      decimal sampleDecimalValueV1   2  Console WriteLine sampleDecimalValueV1 WithTwoDecimalPoints       Output   2 50 2 00

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Here s some examples   decimal a   1 994444M   Math Round a  2     returns 1 99  decimal b   1 995555M   Math Round b  2     returns 2 00   You might also want to look at bankers rounding   round-to-even with the following overload   Math Round a  2  MidpointRounding ToEven     There s more information on it here

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Try this   twoDec   Math Round val  2

User · Answer

Wikipedia has a nice page on rounding in general   All  NET  managed  languages can use any of the common language run time s  the CLR  rounding mechanisms   For example  the Math Round    as mentioned above  method allows the developer to specify the type of rounding  Round-to-even or Away-from-zero   The Convert ToInt32   method and its variations use round-to-even   The Ceiling   and Floor   methods are related   You can round with custom numeric formatting as well   Note that Decimal Round   uses a different method than Math Round     Here is a useful post on the banker s rounding algorithm  See one of Raymond s humorous posts here about rounding

User · Answer

Wikipedia has a nice page on rounding in general   All  NET  managed  languages can use any of the common language run time s  the CLR  rounding mechanisms   For example  the Math Round    as mentioned above  method allows the developer to specify the type of rounding  Round-to-even or Away-from-zero   The Convert ToInt32   method and its variations use round-to-even   The Ceiling   and Floor   methods are related   You can round with custom numeric formatting as well   Note that Decimal Round   uses a different method than Math Round     Here is a useful post on the banker s rounding algorithm  See one of Raymond s humorous posts here about rounding

User · Answer

If you d like a string   gt   1 7289  ToString          1 73    Or a decimal   gt  Math Round  Decimal x  2  1 73m     But remember  Rounding is not distributive  ie  round x y     round x    round y   So don t do any rounding until the very end of a calculation  else you ll lose accuracy

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I know its an old question but please note for the following differences between Math round and String format round   decimal d1    decimal 1 125  Math Round d1  2  Dump         returns 1 12 d1 ToString         Dump       returns  1 13   decimal d2    decimal 1 1251  Math Round d2  2  Dump         returns 1 13 d2 ToString         Dump       returns  1 13

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Personally I never round anything  Keep it as resolute as possible  since rounding is a bit of a red herring in CS anyway  But you do want to format data for your users  and to that end  I find that string Format   0 0 00    number  is a good approach

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public double RoundDown double number  int decimalPlaces                        return Math Floor number   Math Pow 10  decimalPlaces     Math Pow 10  decimalPlaces

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One thing you may want to check is the Rounding Mechanism of Math Round   http   msdn microsoft com en-us library system midpointrounding aspx  Other than that  I recommend the Math Round inputNumer  numberOfPlaces  approach over the  100 100 one because it s cleaner

User · Answer

If you want to round a number  you can obtain different results depending on  how you use the Math Round   function  if for a round-up or round-down   you re working with doubles and or floats numbers  and you apply the midpoint rounding  Especially  when using with operations inside of it or the variable to round comes from an operation  Let s say  you want to multiply these two numbers  0 75   0 95   0 7125  Right  Not in C   Let s see what happens if you want to round to the 3rd decimal   double result   0 75d   0 95d     result   0 71249999999999991 double result   0 75f   0 95f     result   0 71249997615814209  result   Math Round result  3  MidpointRounding ToEven      result   0 712  Ok result   Math Round result  3  MidpointRounding AwayFromZero      result   0 712  Should be 0 713   As you see  the first Round   is correct if you want to round down the midpoint  But the second Round   it s wrong if you want to round up   This applies to negative numbers   double result   -0 75   0 95     result   -0 71249999999999991 result   Math Round result  3  MidpointRounding ToEven      result   -0 712  Ok result   Math Round result  3  MidpointRounding AwayFromZero      result   -0 712  Should be -0 713   So  IMHO  you should create your own wrap function for Math Round   that fit your requirements  I created a function in which  the parameter  roundUp true  means to round to next greater number  That is  0 7125 rounds to 0 713 and -0 7125 rounds to -0 712  because -0 712   -0 713   This is the function I created and works for any number of decimals   double Redondea double value  int precision  bool roundUp   true        if   decimal value    0 0m          return 0 0       double corrector   1   Math Pow 10  precision   2        if   decimal value  lt  0 0m                if  roundUp              return Math Round value  precision  MidpointRounding ToEven           else             return Math Round value - corrector  precision  MidpointRounding AwayFromZero             else               if  roundUp              return Math Round value   corrector  precision  MidpointRounding AwayFromZero           else             return Math Round value  precision  MidpointRounding ToEven             The variable   corrector  is for fixing the inaccuracy of operating with floating or double numbers

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Here s some examples   decimal a   1 994444M   Math Round a  2     returns 1 99  decimal b   1 995555M   Math Round b  2     returns 2 00   You might also want to look at bankers rounding   round-to-even with the following overload   Math Round a  2  MidpointRounding ToEven     There s more information on it here

User · Answer

You should be able to specify the number of digits you want to round to using Math Round YourNumber  2   You can read more here

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Math Floor 123456 646   100    100 Would return 123456 64

User · Answer

You should be able to specify the number of digits you want to round to using Math Round YourNumber  2   You can read more here

User · Answer

Had a weird situation where I had a decimal variable  when serializing 55 50 it always sets default value mathematically as 55 5  But whereas  our client system is seriously expecting 55 50 for some reason and they definitely expected decimal  Thats when I had write the below helper  which always converts any decimal value padded to 2 digits with zeros instead of sending a string   public static class DecimalExtensions       public static decimal WithTwoDecimalPoints this decimal val                return decimal Parse val ToString  0 00               Usage should be  var sampleDecimalValueV1   2 5m  Console WriteLine sampleDecimalValueV1 WithTwoDecimalPoints      decimal sampleDecimalValueV1   2  Console WriteLine sampleDecimalValueV1 WithTwoDecimalPoints       Output   2 50 2 00

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This is for rounding to 2 decimal places in C     label8 Text   valor cuota  ToString  N2       In VB NET    Imports System Math  round label8 text 2

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public double RoundDown double number  int decimalPlaces                        return Math Floor number   Math Pow 10  decimalPlaces     Math Pow 10  decimalPlaces

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Try this   twoDec   Math Round val  2

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convert upto two decimal places  String Format   0 0 00    140 6767554              140 67  String Format   0 0 00    140 1                   140 10  String Format   0 0 00    140                    140 00   Double d   140 6767554  Double dc   Math Round  Double d  2             140 67  decimal d   140 6767554M  decimal dc   Math Round d  2                   140 67                 just two decimal places String Format   0 0       123 4567            123 46  String Format   0 0       123 4               123 4  String Format   0 0       123 0               123    can also combine  0  with       String Format   0 0 0     123 4567            123 46  String Format   0 0 0     123 4               123 4  String Format   0 0 0     123 0               123 0

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Here s some examples   decimal a   1 994444M   Math Round a  2     returns 1 99  decimal b   1 995555M   Math Round b  2     returns 2 00   You might also want to look at bankers rounding   round-to-even with the following overload   Math Round a  2  MidpointRounding ToEven     There s more information on it here

User · Answer

If you d like a string   gt   1 7289  ToString          1 73    Or a decimal   gt  Math Round  Decimal x  2  1 73m     But remember  Rounding is not distributive  ie  round x y     round x    round y   So don t do any rounding until the very end of a calculation  else you ll lose accuracy

User · Answer

One thing you may want to check is the Rounding Mechanism of Math Round   http   msdn microsoft com en-us library system midpointrounding aspx  Other than that  I recommend the Math Round inputNumer  numberOfPlaces  approach over the  100 100 one because it s cleaner

User · Answer

Try this   twoDec   Math Round val  2

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string a    10 65678    decimal d   Math Round Convert ToDouble a ToString    2

User · Answer

One thing you may want to check is the Rounding Mechanism of Math Round   http   msdn microsoft com en-us library system midpointrounding aspx  Other than that  I recommend the Math Round inputNumer  numberOfPlaces  approach over the  100 100 one because it s cleaner

User · Answer

Try this   twoDec   Math Round val  2

User · Answer

Wikipedia has a nice page on rounding in general   All  NET  managed  languages can use any of the common language run time s  the CLR  rounding mechanisms   For example  the Math Round    as mentioned above  method allows the developer to specify the type of rounding  Round-to-even or Away-from-zero   The Convert ToInt32   method and its variations use round-to-even   The Ceiling   and Floor   methods are related   You can round with custom numeric formatting as well   Note that Decimal Round   uses a different method than Math Round     Here is a useful post on the banker s rounding algorithm  See one of Raymond s humorous posts here about rounding

User · Answer

I know its an old question but please note for the following differences between Math round and String format round   decimal d1    decimal 1 125  Math Round d1  2  Dump         returns 1 12 d1 ToString         Dump       returns  1 13   decimal d2    decimal 1 1251  Math Round d2  2  Dump         returns 1 13 d2 ToString         Dump       returns  1 13

User · Answer

convert upto two decimal places  String Format   0 0 00    140 6767554              140 67  String Format   0 0 00    140 1                   140 10  String Format   0 0 00    140                    140 00   Double d   140 6767554  Double dc   Math Round  Double d  2             140 67  decimal d   140 6767554M  decimal dc   Math Round d  2                   140 67                 just two decimal places String Format   0 0       123 4567            123 46  String Format   0 0       123 4               123 4  String Format   0 0       123 0               123    can also combine  0  with       String Format   0 0 0     123 4567            123 46  String Format   0 0 0     123 4               123 4  String Format   0 0 0     123 0               123 0

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Math Floor 123456 646   100    100 Would return 123456 64

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This is for rounding to 2 decimal places in C     label8 Text   valor cuota  ToString  N2       In VB NET    Imports System Math  round label8 text 2

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