initial commit

7 files changed, 60 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a60d365
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+
+*.un~
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Makefile
diff --git a/Q1 b/Q1
new file mode 100755
index 0000000..5691942
--- /dev/null
+++ b/Q1
diff --git a/Q1.cpp b/Q1.cpp
new file mode 100644
index 0000000..6b23316
--- /dev/null
+++ b/Q1.cpp
@@ -0,0 +1,28 @@
+
+#include <iostream>
+#include <cmath>
+
+#include "mysqrt.h"
+
+using namespace std;
+int main()
+{
+    double input;
+    double sq, mysq;
+
+    do { // 
+        cout << "Enter a number (negative to quit)" << endl;
+        cout << ">> ";
+        cin >> input;
+        if (input >= 0) {
+            mysq = mysqrt(input);
+            sq = sqrt(input);
+            cout << "mysqrt(" << input << ") = " << mysq << endl;
+            cout << "sqrt("   << input << ") = " << sq << endl;
+            cout << "sqrt and mysqrt differ by " << abs(sq - mysq) << endl;
+        }
+
+    } while (input >= 0);
+    
+    return 0;
+}
diff --git a/Q2.cpp b/Q2.cpp
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Q2.cpp
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;
+}
diff --git a/mysqrt.h b/mysqrt.h
new file mode 100644
index 0000000..459cc99
--- /dev/null
+++ b/mysqrt.h
@@ -0,0 +1,9 @@
+
+#ifndef MYSQRT_H
+#define MYSQRT_H
+
+#include <cmath>
+
+double mysqrt(double x);
+
+#endif