Is there a between function in C

Question

Google doesn t understand that  between  is the name of the function I m looking for and returns nothing relevant   Ex  I want to check if 5 is between 0 and 10 in only one operation

User · Answer

Nope  you ll have to test each endpoint individually   if   x  gt  0   amp  amp   x  lt  10           do stuff     Or if you want it to look more  betweeny   reorder the args   if   0  lt  x   amp  amp   x  lt  10           do stuff

User · Answer

I don t know that function  anyway if your value is unsigned  just one operation means  val  lt  11     If it is signed  I think there is no atomic way to do it because 10 is not a power of 2

User · Answer

So far  it looks like none of the answers have considered the likely possibility that dynamically  you don t know which value is the lower and upper bound   For the general case  you could create your own IsBetween method that would probably go something like       public bool IsBetween double testValue  double bound1  double bound2                return  testValue  gt   Math Min bound1 bound2   amp  amp  testValue  lt   Math Max bound1 bound2

User · Answer

Base  Dan J this version don t care max min  more like sql     public static bool IsBetween this decimal me  decimal a  decimal b  bool include   true        var left   Math Min a  b       var righ   Math Max a  b        return include            me  gt   left  amp  amp  me  lt   righ             me  gt  left  amp  amp  me  lt  righ

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Here s a complete class        lt summary gt      An extension class for the between operation     name pattern IsBetweenXX where X   I - gt  Inclusive  X   E - gt  Exclusive      lt a href  https   stackoverflow com a 13470099 37055  gt  lt  a gt       lt  summary gt  public static class BetweenExtensions             lt summary gt          Between check  lt   CDATA min  lt   value  lt   max   gt            lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt the value to check lt  param gt           lt param name  min  gt Inclusive minimum border lt  param gt           lt param name  max  gt Inclusive maximum border lt  param gt           lt returns gt return true if the value is between the min  amp  max else false lt  returns gt      public static bool IsBetweenII lt T gt  this T value  T min  T max  where T IComparable lt T gt                return  min CompareTo value   lt   0   amp  amp   value CompareTo max   lt   0                   lt summary gt          Between check  lt   CDATA min  lt  value  lt   max   gt           lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt the value to check lt  param gt           lt param name  min  gt Exclusive minimum border lt  param gt           lt param name  max  gt Inclusive maximum border lt  param gt           lt returns gt return true if the value is between the min  amp  max else false lt  returns gt      public static bool IsBetweenEI lt T gt  this T value  T min  T max  where T IComparable lt T gt                return  min CompareTo value   lt  0   amp  amp   value CompareTo max   lt   0                   lt summary gt          between check  lt   CDATA min  lt   value  lt  max   gt           lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt the value to check lt  param gt           lt param name  min  gt Inclusive minimum border lt  param gt           lt param name  max  gt Exclusive maximum border lt  param gt           lt returns gt return true if the value is between the min  amp  max else false lt  returns gt      public static bool IsBetweenIE lt T gt  this T value  T min  T max  where T IComparable lt T gt                return  min CompareTo value   lt   0   amp  amp   value CompareTo max   lt  0                   lt summary gt          between check  lt   CDATA min  lt  value  lt  max   gt           lt  summary gt           lt typeparam name  T  gt  lt  typeparam gt           lt param name  value  gt the value to check lt  param gt           lt param name  min  gt Exclusive minimum border lt  param gt           lt param name  max  gt Exclusive maximum border lt  param gt           lt returns gt return true if the value is between the min  amp  max else false lt  returns gt       public static bool IsBetweenEE lt T gt  this T value  T min  T max  where T IComparable lt T gt                return  min CompareTo value   lt  0   amp  amp   value CompareTo max   lt  0             plus some unit test code   TestClass  public class UnitTest1        TestMethod      public void TestMethodIsBeetween                 Assert IsTrue 5 0 IsBetweenII 5 0  5 0            Assert IsFalse 5 0 IsBetweenEI 5 0  5 0            Assert IsFalse 5 0 IsBetweenIE 5 0  5 0            Assert IsFalse 5 0 IsBetweenEE 5 0  5 0             Assert IsTrue 5 0 IsBetweenII 4 9  5 0            Assert IsTrue 5 0 IsBetweenEI 4 9  5 0            Assert IsFalse 5 0 IsBetweenIE 4 9  5 0            Assert IsFalse 5 0 IsBetweenEE 4 9  5 0             Assert IsTrue 5 0 IsBetweenII 5 0  5 1            Assert IsFalse 5 0 IsBetweenEI 5 0  5 1            Assert IsTrue 5 0 IsBetweenIE 5 0  5 1            Assert IsFalse 5 0 IsBetweenEE 5 0  5 1             Assert IsTrue 5 0 IsBetweenII 4 9  5 1            Assert IsTrue 5 0 IsBetweenEI 4 9  5 1            Assert IsTrue 5 0 IsBetweenIE 4 9  5 1            Assert IsTrue 5 0 IsBetweenEE 4 9  5 1             Assert IsFalse 5 0 IsBetweenII 5 1  4 9            Assert IsFalse 5 0 IsBetweenEI 5 1  4 9            Assert IsFalse 5 0 IsBetweenIE 5 1  4 9            Assert IsFalse 5 0 IsBetweenEE 5 1  4 9

User · Answer

And for negatives values       Public Function IsBetween Of T  item As T  pStart As T  pEnd As T  As Boolean   https   msdn microsoft com fr-fr library bb384936 aspx     Dim Deb As T   pStart     Dim Fin As T   pEnd     If  Comparer Of T  Default Compare pStart  pEnd   gt  0  Then Deb   pEnd   Fin   pStart     Return Comparer Of T  Default Compare item  Deb   gt   0 AndAlso Comparer Of T  Default Compare item  Fin   lt   0 End Function

User · Answer

It isn t clear what you mean by  one operation   but no  there s no operator   framework method that I know of to determine if an item is within a range   You could of course write an extension-method yourself  For example  here s one that assumes that the interval is closed on both end-points   public static bool IsBetween lt T gt  this T item  T start  T end        return Comparer lt T gt  Default Compare item  start   gt   0          amp  amp  Comparer lt T gt  Default Compare item  end   lt   0      And then use it as   bool b   5 IsBetween 0  10      true

User · Answer

No  but you can write your own   public static bool Between this int num  int lower  int upper  bool inclusive   false        return inclusive           lower  lt   num  amp  amp  num  lt   upper           lower  lt  num  amp  amp  num  lt  upper

User · Answer

What about      somenumber    Math Max 0 Math Min 10 somenumber      returns true when somenumber is 5  returns false when somenumber is 11

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As  Hellfrost pointed out  it is literally nonsense to compare a number to two different numbers in  one operation   and I know of no C  operator that encapsulates this   between    0  lt  5  amp  amp  5  lt  10     Is about the most-compact form I can think of   You could make a somewhat  fluent -looking method using extension  though  while amusing  I think it s overkill    public static bool Between this int x  int a  int b        return  a  lt  x   amp  amp   x  lt  b       Use   int x   5  bool b   x Between 0 10

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Except for the answer by  Ed G  all of the answers require knowing which bound is the lower and which is the upper one    Here s a  rather non-obvious  way of doing it when you don t know which bound is which          lt summary gt        Method to test if a value is  between  two other values  when the relative magnitude of        the two other values is not known  i e   number1 may be larger or smaller than number2         The range is considered to be inclusive of the lower value and exclusive of the upper        value  irrespective of which parameter  number1 or number2  is the lower or upper value         This implies that if number1 equals number2 then the result is always false               This was extracted from a larger function that tests if a point is in a polygon        http   www ecse rpi edu Homepages wrf Research Short Notes pnpoly html        lt  summary gt         lt param name  testValue  gt value to be tested for being  between  the other two numbers lt  param gt         lt param name  number1  gt one end of the range lt  param gt         lt param name  number2  gt the other end of the range lt  param gt         lt returns gt true if testValue  gt   lower of the two numbers and less than upper of the two numbers                 false otherwise  incl  if number1    number2 lt  returns gt    private static bool IsInRange T testValue  T number1  T number2           return  testValue  lt   number1      testValue  lt   number2         Note  This is NOT a generic method  it is pseudo code  The T in the above method should be replaced by a proper type   int  or  float  or whatever   There are ways of making this generic  but they re sufficiently messy that it s not worth while for a one-line method  at least not in most situations

User · Answer

Wouldn t it be as simple as  0  lt  5  amp  amp  5  lt  10      So I suppose if you want a function out of it you could simply add this to a utility class   public static bool Between int num  int min  int max        return min  lt  num  amp  amp  num  lt  max

User · Answer

There is no built in construct in C   NET  but you can easily add your own extension method for this   public static class ExtensionsForInt32       public static bool IsBetween  this int val  int low  int high                   return val  gt  low  amp  amp  val  lt  high            Which can be used like   if  5 IsBetween  0  10        Do something

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int val to check   5 bool in range   Enumerable Range 0  13  Contains val to check     The second parameter is the  count  not the end or high number   I E   int low num   0 int high num   12 int val to check   5 bool in range   Enumerable Range low num   high num - low num   1  Contains val to check     Checks if the val to check is between 0 and 12

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Refer to this link  A one line solution to that question   How to elegantly check if a number is within a range   int x   30  if  Enumerable Range 1 100  Contains x     true  if  x  gt   1  amp  amp  x  lt   100    true   I know the post is pretty old  but It may help others

User · Answer

Or if you want to bound the value to the interval   public static T EnsureRange lt T gt  this T value  T min  T max  where T   IComparable lt T gt                if  value CompareTo min   lt  0              return min          else if  value CompareTo max   gt  0              return max          else             return value          It is like two-sided Math Min Max

User · Answer

Generic function that is validated at compilation   public static bool IsBetween lt T gt  this T item  T start  T end  where T   IComparable       return item CompareTo start   gt   0  amp  amp  item CompareTo end   lt   0

[c#] Is there a "between" function in C#?

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