1 files changed, 21 insertions, 0 deletions
diff --git a/mysqrt.cpp b/mysqrt.cpp
new file mode 100644
index 0000000..29fedf2
--- /dev/null
+++ b/mysqrt.cpp
@@ -0,0 +1,21 @@
+
+#include "mysqrt.h"
+
+using namespace std;
+double mysqrt(double x)
+{
+    bool goodenough = false;
+    double guess;
+    double last = x / 5.0;
+
+    if (x <= 0)
+        return x;
+
+    while (!goodenough) {
+        guess = (last + (x / last)) / 2.0;
+        last = guess;
+
+        goodenough = abs(guess - last) <= 0.000000001;
+    }
+    return guess;
+}