49ce4d6ff4
* Fix typo in #include * Remove CMakeLists file that users should create * Clarify which files users are expected to create * Highlight the importance of configuring TutorialConfig.h.in after the MY_MATH option has been set
23 lines
456 B
C++
23 lines
456 B
C++
#include <iostream>
|
|
|
|
// a hack square root calculation using simple operations
|
|
double mysqrt(double x)
|
|
{
|
|
if (x <= 0) {
|
|
return 0;
|
|
}
|
|
|
|
double result = x;
|
|
|
|
// do ten iterations
|
|
for (int i = 0; i < 10; ++i) {
|
|
if (result <= 0) {
|
|
result = 0.1;
|
|
}
|
|
double delta = x - (result * result);
|
|
result = result + 0.5 * delta / result;
|
|
std::cout << "Computing sqrt of " << x << " to be " << result << std::endl;
|
|
}
|
|
return result;
|
|
}
|