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Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx

 

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#include <stdio.h>

 

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#include "MathFunctions.h"

 

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#include "TutorialConfig.h"

 

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// include the generated table

 

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#include "Table.h"

 

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#include <math.h>

 

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// a hack square root calculation using simple operations

 

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double mysqrt(double x)

 

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{

 

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  if (x <= 0)

 

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    {

 

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    return 0;

 

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    }

 

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  double result;

 

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  // if we have both log and exp then use them

 

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  double delta;  

 

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  // use the table to help find an initial value

 

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  result = x;

 

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  if (x >= 1 && x < 10)

 

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    {

 

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    result = sqrtTable[static_cast<int>(x)];

 

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    }

 

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  // do ten iterations

 

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  int i;

 

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  for (i = 0; i < 10; ++i)

 

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    {

 

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    if (result <= 0)

 

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      {

 

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      result = 0.1;

 

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      }

 

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    delta = x - (result*result);

 

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    result = result + 0.5*delta/result;

 

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    fprintf(stdout,"Computing sqrt of %g to be %g\n",x,result);

 

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    }

 

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  return result;

 

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}

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