Is there an exponent operator in C

Question

For example  does an operator exist to handle this   float Result  Number1  Number2   Number1   2  Number2   2   Result   Number1  operator  Number2    In the past the   operator has served as an exponential operator in other languages  but in C  it is a bit-wise operator   Do I have to write a loop or include another namespace to handle exponential operations  If so  how do I handle exponential operations using non-integers

User · Answer

I stumbled on this post looking to use scientific notation in my code, I used

4.95*Math.Pow(10,-10);

But afterwards I found out you can do

4.95E-10;

Just thought I would add this for anyone in a similar situation that I was in.

User · Answer

Since no-one has yet wrote a function to do this with two integers  here s one way   private long CalculatePower int number  int powerOf        for  int i   powerOf  i  gt  1  i--          number    number      return number    CalculatePower 5  3      125 CalculatePower 8  4      4096 CalculatePower 6  2      36   Alternatively in VB NET   Private Function CalculatePower number As Integer  powerOf As Integer  As Long     For i As Integer   powerOf To 2 Step -1         number    number     Next     Return number End Function CalculatePower 5  3    125 CalculatePower 8  4    4096 CalculatePower 6  2    36

User · Answer

The lack of an exponential operator for C  was a big annoyance for us when looking for a new language to convert our calculation software to from the good ol  vb6  I m glad we went with C  but it still annoys me whenever I m writing a complex equation including exponents  The Math Pow   method makes equations quite hard to read IMO  Our solution was to create a special DoubleX class where we override the  -operator  see below  This works fairly well as long as you declare at least one of the variables as DoubleX  DoubleX a   2  DoubleX b   3   Console WriteLine   quot a    a   b    b   a b    a   b  quot     or use an explicit converter on standard doubles  double c   2  double d   3   Console WriteLine   quot c    c   d    d   c d    c    DoubleX d  quot           Need explicit converter  One problem with this method though is that the exponent is calculated in the wrong order compared to other operators  This can be avoided by always putting an extra     around the operation which again makes it a bit harder to read the equations  DoubleX a   2  DoubleX b   3   Console WriteLine   quot a    a   b    b   3 a b    3   a   b  quot              Wrong result Console WriteLine   quot a    a   b    b   3 a b    3    a   b   quot            Correct result  I hope this can be of help to others who uses a lot of complex equations in their code  and maybe someone even has an idea of how to improve this method   DoubleX class  using System   namespace ExponentialOperator            lt summary gt          Double class that uses   as exponential operator          lt  summary gt      public class DoubleX                region ---------------- Fields ----------------          private readonly double  value            endregion ------------- Fields ----------------           region -------------- Properties --------------          public double Value                       get   return  value                        endregion ----------- Properties --------------           region ------------- Constructors -------------          public DoubleX double value                         value   value                     public DoubleX int value                         value   Convert ToDouble value                       endregion ---------- Constructors -------------           region --------------- Methods ----------------          public override string ToString                         return  value ToString                        endregion ------------ Methods ----------------           region -------------- Operators ---------------             Change the   operator to be used for exponents           public static DoubleX operator   DoubleX value  DoubleX exponent                        return Math Pow value  exponent                      public static DoubleX operator   DoubleX value  double exponent                        return Math Pow value  exponent                      public static DoubleX operator   double value  DoubleX exponent                        return Math Pow value  exponent                      public static DoubleX operator   DoubleX value  int exponent                        return Math Pow value  exponent                       endregion ----------- Operators ---------------           region -------------- Converters --------------             Allow implicit convertion          public static implicit operator DoubleX double value                        return new DoubleX value                      public static implicit operator DoubleX int value                        return new DoubleX value                      public static implicit operator Double DoubleX value                        return value  value                      endregion ----------- Converters --------------

User · Answer

The C  language doesn t have a power operator  However  the  NET Framework offers the Math Pow method   Returns a specified number raised to the specified power   So your example would look like this  float Result  Number1  Number2   Number1   2  Number2   2   Result   Math Pow Number1  Number2

User · Answer

A good power function would be public long Power int number  int power        if  number    0  return 0      long t   number      int e   power      int result   1      for i 0  i lt sizeof int   i              if  e  amp  1    1  result    t          e  gt  gt   1          if  e  0  break          t   t   t           The Math Pow function uses the processor power function and is more efficient

User · Answer

I m surprised no one has mentioned this  but for the simple  and probably most encountered  case of squaring  you just multiply by itself  float someNumber   float result   someNumber   someNumber

User · Answer

There is a blog post on MSDN about why an exponent operator does NOT exists from the C  team   It would be possible to add a power operator to the language  but performing this operation is a fairly rare thing to do in most programs  and it doesn t seem justified to add an operator when calling Math Pow   is simple    You asked   Do I have to write a loop or include another namespace to handle exponential operations  If so  how do I handle exponential operations using non-integers   Math Pow supports double parameters so there is no need for you to write your own

User · Answer

For what it s worth I do miss the   operator when raising a power of 2 to define a binary constant  Can t use Math Pow   there  but shifting an unsigned int of 1 to the left by the exponent s value works  When I needed to define a constant of  2 24 -1   public static int Phase count   24  public static uint PatternDecimal Max     uint 1  lt  lt  Phase count  - 1    Remember the types must be  uint   lt  lt   int

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