Question

function to calculate Power in C#

Asked by: ayha1999

hi,

how can write a function in C# to calcuate power and display in textbox?

ayha

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Asked On: 2009-10-19 at 08:06:38ID24823784
Topic: C# Programming Language
Participating Experts: 2
Points: 30
Comments: 11

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Answers

by: silemonePosted on 2009-10-19 at 08:15:03ID: 25605903

textbox.text = calculatePower(num, pow);

public string calculatePower(int num, int pow)
{
int x = 1;
if (pow < 1)
return "0";
if (pow == 1)
return num.ToString();
for (int i = 1; i <= pow; i++)
{
x*=x;
}
return x.ToString();
}

by: silemonePosted on 2009-10-19 at 08:15:53ID: 25605913

crap...I should have asked...what is your profession? you're not a student are you?

by: ayha1999Posted on 2009-10-19 at 08:17:55ID: 25605935

I am new to C#, not a student.

by: silemonePosted on 2009-10-19 at 08:22:13ID: 25605989

cool

public string calculatePower(int num, int pow)
{
int x = 1;
if (pow == 0)
return "1";
if (pow == 1)
return num.ToString();
for (int i = 1; i <= pow; i++)
{
x*=x;
}
return x.ToString();
}

this only captures positive powers...

by: Snarf0001Posted on 2009-10-19 at 08:23:55ID: 25606012

There's a built in function, it's just limited to a double:

For 2 to the power of 5:

Math.Pow(2, 5);

by: silemonePosted on 2009-10-19 at 08:25:09ID: 25606029

public string calculatePower(int num, int pow)
{

if (pow == 0)
return "1";
if (pow == 1)
return num.ToString();
for (int i = 1; i <= pow; i++)
{
num*=num;
}
return x.ToString();
}

by: silemonePosted on 2009-10-19 at 08:26:00ID: 25606036

oops..yes there is...but I thought he wanted to practice coding...if that's not your agenda, then snarf's solution works...

by: Snarf0001Posted on 2009-10-19 at 08:36:22ID: 25606161

Incidentally, there's a couple things wrong with your code silemone:

1) You need to store the original number and mutliply by that. In your code running 2 ^ 3 for example, you'd end up with 2 * 2 first resulting in four, 2nd loop would then run 4 *4, NOT 4 * 2 which it should be.

2) You need to drop the <= in your loop to a <, otherwise you're going to have an extra multiplication.

        public string calculatePower(int num, int pow)
        {
            int number = num;
 
            if (pow == 0)
                return "1";
            if (pow == 1)
                return num.ToString();
            for (int i = 1; i < pow; i++)
            {
                number *= num;
            }
            return number.ToString();
        }

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by: silemonePosted on 2009-10-19 at 08:38:16ID: 25606192

Anyway, there's code below just so you can follow...

anyway, have fun...and as snarf pointed, there are many built in functions/methods..so look over the libraries when you get the chance...

public string calculatePower(int num, int pow)
{
     bool pos = true;
 
     if (pow == 0)
        return "1";
     if (pow == 1)
        return num.ToString();    
     
 
     if (pow < 0)  //tests if exponent is positive or negative to see if reciprocal needed.
        pos = false;
 
     //gets absolute value of number...
 
      for (int i = 1; i < Math.Abs(pow); i++ )
      {
           num* = num;
      }
      if (!pos)
         return reciprocate(num);  //negative exponents are reciprocate...
      else
         return num.ToString();  //if not negative, no reciprocal...returns value from for loop as is
}
 
//function that gives reciprocal of negative exponent...returns string
public string reciprocate(int num);
{
       return "1/" + num.ToString();
}

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by: silemonePosted on 2009-10-19 at 08:39:10ID: 25606206

Snarf...cool...fix it and pass it to ayha...i'm rushing here in the office...

by: Snarf0001Posted on 2009-10-19 at 08:55:58ID: 25606378

Okay, so a final note on this:

IF you are only going to use integer values, then it's probably worthwhile to do inline coding as shown. There's a host of discussion online about this. Basically Math.Pow has to take into account fracional expononents to be reliable, to the math behind it is far more complicated than integer multiplication.

I haven't run tests myself, but general concensus seems to be custom function will outperform Math.Pow in integer exponents.

If your using doubles or just don't want to bother, then Math.Pow is the way to go.

Modified code is below to allow for proper negative exponents:

        public string calculatePower(int num, int pow)
        {
            int number = num;
 
            if (pow == 0) return "1";
            if (pow == 1) return num.ToString();
 
            for (int i = 1; i < Math.Abs(pow); i++)
                number *= num;
 
            if (pow < 0)
                return Convert.ToString((1f / number));
            else
                return number.ToString();
        }

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Question

function to calculate Power in C#

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C# Programming Language

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