day 2: 69-sqrt-x

also refactored, added drivers

69-sqrt-x/driver.cpp

@@ -0,0 +1,12 @@
+#include "soln.hpp"
+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+	int x = 69, answer = 8;
+	Solution soln;
+	cout << "Square root correct? " << soln.test(x, answer) << endl;
+	return 0;
+}

69-sqrt-x/soln.cpp

@@ -0,0 +1,32 @@
+#include "soln.hpp"
+#include <cmath>
+
+int Solution::mySqrt(int x)
+{
+	// base case
+	if (x == 0 || x == 1)
+	{
+		return x;
+	}
+	// effectively only till ~sqrt(x)
+	for (int i = 2; i <= x; i++)
+	{
+		long i_square = long(i) * i;
+		// x is a perfect square
+		if (i_square == x)
+		{
+			return int(i);
+		}
+		// x is not a perfect square
+		else if (i_square > x)
+		{
+			return int(i - 1);
+		}
+	}
+	return -1; // compiler fuss
+}
+
+bool Solution::test(int x, int answer)
+{
+	return answer == mySqrt(x);
+}

69-sqrt-x/soln.hpp

@@ -0,0 +1,6 @@
+class Solution
+{
+public:
+	int mySqrt(int x);
+	bool test(int x, int answer);
+};