38 lines
877 B
C++
38 lines
877 B
C++
#include "mysqrt.h"
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#include <iostream>
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namespace mathfunctions {
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namespace detail {
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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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return 0;
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}
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// TODO 5: If both HAVE_LOG and HAVE_EXP are defined, use the following:
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//// double result = std::exp(std::log(x) * 0.5);
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//// std::cout << "Computing sqrt of " << x << " to be " << result
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//// << " using log and exp" << std::endl;
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// else, use the existing logic.
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// Hint: Don't forget the #endif before returning the result!
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double result = x;
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// do ten iterations
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for (int i = 0; i < 10; ++i) {
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if (result <= 0) {
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result = 0.1;
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}
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double delta = x - (result * result);
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result = result + 0.5 * delta / result;
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std::cout << "Computing sqrt of " << x << " to be " << result << std::endl;
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}
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return result;
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}
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}
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}
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