CMake/Tests/Tutorial/Step3/MathFunctions/mysqrt.cxx

30 lines
504 B
C++
Raw Normal View History

2005-11-10 18:50:09 +03:00
#include <stdio.h>
#include "MathFunctions.h"
// a hack square root calculation using simple operations
double mysqrt(double x)
{
if (x <= 0)
{
return 0;
}
2005-11-10 18:50:09 +03:00
double result;
double delta;
2005-11-10 18:50:09 +03:00
result = x;
// do ten iterations
int i;
for (i = 0; i < 10; ++i)
{
if (result <= 0)
{
result = 0.1;
}
delta = x - (result*result);
result = result + 0.5*delta/result;
fprintf(stdout,"Computing sqrt of %g to be %g\n",x,result);
}
return result;
}