* day03

day03.java

@@ -0,0 +1,78 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class day03 {
+
+	public static void main(String[] args) throws IOException {
+		String gammaCalc = "";
+		String epsilonCalc = "";
+		int gammaVal = 0;
+		int epsilonVal = 0;
+
+		int finalAns = 0;
+
+		String line;
+
+		BufferedReader in = new BufferedReader(new FileReader("day03-input.txt"));
+		line = in.readLine();
+
+		int numLengthHuman = line.length();
+
+		// [0] will not have anything i think
+		int[] zeroCounter = new int[numLengthHuman + 1];
+		int[] oneCounter = new int[numLengthHuman + 1];
+		// temporary var, concat into an int for gammaVal/ epsilonVal.
+		String[] tempC = new String[numLengthHuman + 1];
+
+		while (line != null) {
+
+			for (int i = 1; i <= line.length(); i++) {
+
+				int currentNum = Integer.valueOf(line.substring(i - 1, i));
+
+				if (currentNum == 0) {
+					zeroCounter[i]++;
+				}
+				if (currentNum == 1) {
+					oneCounter[i]++;
+				}
+			}
+
+			line = in.readLine();
+		}
+		in.close();
+
+		// calc gamma
+		for (int i = 1; i <= numLengthHuman; i++) {
+
+			if (zeroCounter[i] > oneCounter[i]) {
+				tempC[i] = "0";
+			} else {
+				tempC[i] = "1";
+			}
+			
+			gammaCalc = gammaCalc + tempC[i];
+		}
+
+		gammaVal = Integer.parseInt(gammaCalc, 2); // some weird conversion thing?
+
+		// calc epsilon
+		for (int i = 1; i <= numLengthHuman; i++) {
+
+			if (zeroCounter[i] > oneCounter[i]) {
+				tempC[i] = "1"; // this time, one is the least
+			} else {
+				tempC[i] = "0";
+			}
+
+			epsilonCalc = epsilonCalc + tempC[i];
+		}
+
+		epsilonVal = Integer.parseInt(epsilonCalc, 2);
+
+		finalAns = gammaVal * epsilonVal;
+		System.out.println(finalAns);
+
+	}
+}