How to Round to the nearest whole number in C

Question

How can I round values to nearest integer   For example   1 1   gt  1 1 5   gt  2 1 9   gt  2    Math Ceiling    is not helping me  Any ideas

User · Answer

You can use Math Round as others have suggested  recommended   or you could add 0 5 and cast to an int  which will drop the decimal part    double value   1 1  int roundedValue    int  value   0 5      equals 1  double value2   1 5  int roundedValue2    int  value2   0 5      equals 2

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Math Ceiling   always rounds up  towards the ceiling   Math Floor   always rounds down  towards to floor   what you are after is simply   Math Round   which rounds as per this post

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there s this manual  and kinda cute way too   double d1   1 1  double d2   1 5  double d3   1 9   int i1    int  d1   0 5   int i2    int  d2   0 5   int i3    int  d3   0 5     simply add 0 5 to any number  and cast it to int  or floor it  and it will be mathematically correctly rounded  D

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Write your own round method  Something like   function round x      rx   Math ceil x      if  rx - x  lt    000001          return int rx      else         return int x  end

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var roundedVal   Math Round 2 5  0     It will give result   var roundedVal   3

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You have the Math Round function that does exactly what you want   Math Round 1 1  results with 1 Math Round 1 8  will result with 2     and so one

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Just a reminder  Beware for double    Math Round 0 3   0 2   result in 1  because in double 0 3   0 2   1 49999999 Math Round  1 5     2

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If your working with integers rather than floating point numbers  here is the way    define ROUNDED FRACTION numr denr    numr denr     numr denr  lt  denr 2   0 1     Here both  numr  and  denr  are unsigned integers

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You need Math Round  not Math Ceiling  Ceiling always  rounds  up  while Round rounds up or down depending on the value after the decimal point

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decimal RoundTotal   Total -  int Total  if   double RoundTotal  lt    50     Total    int Total  else    Total    int Total   1  lblTotal Text   Total ToString

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I was looking for this  but my example was to take a number  such as 4 2769 and drop it in a span as just 4 3   Not exactly the same  but if this helps   Model Statistics AverageReview    lt   it s just a double from the model   Then    Model Statistics AverageReview ToString  n1      lt  gives me 4 3  Model Statistics AverageReview ToString  n2      lt  gives me 4 28   etc

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See the official documentation for more  For example   Basically you give the Math Round method three parameters    The value you want to round  The number of decimals you want to keep after the value  An optional parameter you can invoke to use AwayFromZero rounding   ignored unless rounding is ambiguous  e g  1 5    Sample code   var roundedA   Math Round 1 1  0      Output  1 var roundedB   Math Round 1 5  0  MidpointRounding AwayFromZero      Output  2 var roundedC   Math Round 1 9  0      Output  2 var roundedD   Math Round 2 5  0      Output  2 var roundedE   Math Round 2 5  0  MidpointRounding AwayFromZero      Output  3 var roundedF   Math Round 3 49  0  MidpointRounding AwayFromZero      Output  3   Live Demo  You need MidpointRounding AwayFromZero if you want a  5 value to be rounded up  Unfortunately this isn t the default behavior for Math Round    If using MidpointRounding ToEven  the default  the value is rounded to the nearest even number  1 5 is rounded to 2  but 2 5 is also rounded to 2

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Use Math Round   double roundedValue   Math Round value  0

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this will round up to the nearest 5 or not change if it already is divisible by 5  public static double R double x           markup to nearest 5     return    int  x   5     5      x   5   gt  0   5   0

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Using Math Round number  rounds to the nearest whole number

[c#] How to Round to the nearest whole number in C#

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