From f279107065146a4940f5e73602a1c3c09e58b31d Mon Sep 17 00:00:00 2001
From: Santo Cariotti <dcariotti24@gmail.com>
Date: Sun, 18 Oct 2020 18:56:43 +0200
Subject: chore: name of first year folder

---
 1_anno/Programmazione_2/algorithms/sqrt.cc | 46 ++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 1_anno/Programmazione_2/algorithms/sqrt.cc

(limited to '1_anno/Programmazione_2/algorithms/sqrt.cc')

diff --git a/1_anno/Programmazione_2/algorithms/sqrt.cc b/1_anno/Programmazione_2/algorithms/sqrt.cc
new file mode 100644
index 0000000..aa6b032
--- /dev/null
+++ b/1_anno/Programmazione_2/algorithms/sqrt.cc
@@ -0,0 +1,46 @@
+#include<iostream>
+
+using namespace std;
+
+double abs(double n) {
+    if(n < 0) return -n;
+
+    return n;
+}
+
+
+double sq(int n) {
+    double x = n;
+    double y = 1;
+    while(x-y > 0.0000001) {
+        x = (x+y)/2;
+        y = n/x;
+    }
+    return x;
+}
+
+double sq2_n(double n, double a) {
+    if(abs(a*a - n) <= 0.000001) {
+        return a;
+    }
+
+    return sq2_n(n, (a+n/a)/2);
+}
+
+double sq2(int n) {
+    return sq2_n(n, n/2);
+}
+
+double sqrt_d(int n) {
+    double x = 1;
+    while(abs(x*x-n)>=0.0000001) {
+        x = ((n/x)+x)/2;
+    }
+    return x;
+}
+
+int main() {
+    cout << sq(81) << endl;
+    cout << sq2(81) << endl;
+    return 0;
+}
-- 
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