finish java;complete cpp 8.23 lab

cpp/8.23-lab-swapping-variables/main.cpp

@@ -0,0 +1,36 @@
+/*
+ * Write a program whose input is two integer and whose output is the two
+ * integers swapped
+ * Example
+ * Input:
+ * 3 8
+ * output:
+ * 8 3
+ * Must define and call a function
+ * void SwapValues(int& userVal1, int& userVal2)
+ */
+
+#include <iostream>
+using namespace std;
+
+/* Define your function here */
+
+void SwapValues(int& userVal1, int& userVal2){
+  int temp;
+  temp = userVal1;
+  userVal1 = userVal2;
+  userVal2 = temp;
+
+}
+int main() {
+   /* Type your code here. Your code must call the function.  */
+  int val1;
+  int val2;
+
+  cin >> val1;
+  cin >> val2;
+  SwapValues(val1, val2);
+  cout << val1 << " " << val2 << endl;
+
+   return 0;
+}

cpp/8.8.1-function-pass-by-reference/main.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+using namespace std;
+
+/* Your solution goes here  */
+/* Note how we put the reference bits in the function declaration
+ * instead of passing &var.
+ */
+
+void CoordTransform(int& xVal, int& yVal, int& xValNew, int& yValNew){
+   
+   xValNew = (xVal + 1) * 2;
+   yValNew = (yVal + 1) * 2;
+}
+
+int main() {
+   int xValNew;
+   int yValNew;
+   int xValUser;
+   int yValUser;
+
+   cin >> xValUser;
+   cin >> yValUser;
+
+   CoordTransform(xValUser, yValUser, xValNew, yValNew);
+   cout << "(" << xValUser << ", " << yValUser << ") becomes (" << xValNew << ", " << yValNew << ")" << endl;
+
+   return 0;
+}

cpp/8.8.1-function-pass-by-reference/main.cpp~

@@ -0,0 +1,25 @@
+#include <iostream>
+using namespace std;
+
+/* Your solution goes here  */
+
+void CoordTransform(int& xVal, int& yVal, int& xValNew, int& yValNew){
+   
+   xValNew = (xVal + 1) * 2;
+   yValNew = (yVal + 1) * 2;
+}
+
+int main() {
+   int xValNew;
+   int yValNew;
+   int xValUser;
+   int yValUser;
+
+   cin >> xValUser;
+   cin >> yValUser;
+
+   CoordTransform(xValUser, yValUser, xValNew, yValNew);
+   cout << "(" << xValUser << ", " << yValUser << ") becomes (" << xValNew << ", " << yValNew << ")" << endl;
+
+   return 0;
+}

cpp/8.9.2-Modify-a-string-arameter/main.cpp

@@ -0,0 +1,25 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+void MakeSentenceExcited(string& sentenceText) {
+
+   /* Your solution goes here  */
+  //Note that I had to use single quotes.   
+   for (int i =0; i<sentenceText.size();i++){
+    if (sentenceText.at(i) == '.'){
+       sentenceText.at(i) = '!';
+    }
+   }
+
+}
+
+int main() {
+   string testStr;
+
+   getline(cin, testStr);
+   MakeSentenceExcited(testStr);
+   cout << testStr;
+
+   return 0;
+}

cpp/8.9.3-swap-vector-ends/main.cpp

@@ -0,0 +1,34 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+/* Your solution goes here  */
+
+void SwapVectorEnds(vector<int>& v){
+   int temp;
+   temp = v.at(0);
+   
+   v.at(0) = v.at(v.size()-1);
+   
+   v.at(v.size()-1) = temp;
+}
+
+int main() {
+   vector<int> sortVector(4);
+   unsigned int i;
+   int userNum;
+
+   for (i = 0; i < sortVector.size(); ++i) {
+      cin >> userNum;
+      sortVector.at(i) = userNum;
+   }
+
+   SwapVectorEnds(sortVector);
+
+   for (i = 0; i < sortVector.size(); ++i) {
+      cout << sortVector.at(i) << " ";
+   }
+   cout << endl;
+
+   return 0;
+}

java/week8/exception-output-file/mainProgram.java

@@ -9,9 +9,17 @@ import java.io.IOException;
  * instead of the screen.
 */
 
-public class main {
+public class mainProgram {
 
-	public static  ArrayList<String> getInput(Scanner scnr){
+	public static  ArrayList<String> readInput(final String fileName)
+			throws IOException{
+
+		FileInputStream fileByteStream = null; // File input stream
+		Scanner scnr = null;  				   // Scanner object
+
+		System.out.println("Opening file " + fileName);
+		fileByteStream = new FileInputStream(fileName);
+		scnr = new Scanner(fileByteStream);
 
 		String s = "";
 		String name;
@@ -51,44 +59,42 @@ public class main {
 
 			System.out.println();
 		}
+		System.out.println("Closing scanner:");
+		fileByteStream.close();
+		scnr.close();
 		return results;
 	}
 
-	public static void main(String[] args) throws IOException {
+	public static void writeArrayListToFile(ArrayList<String> arr,
-		FileInputStream fileByteStream = null; // File input stream
+											final String fileName)
-		Scanner inFS = null;  				   // Scanner object
+			throws IOException{
+		FileOutputStream fileStream = null;
+		PrintWriter file = null;
 
-		ArrayList<String> userInputs = new ArrayList<String>();
+		fileStream = new FileOutputStream(fileName);
+		file = new PrintWriter(fileStream);
+
+		System.out.println("Writing out results " +
+				           "To " + fileName );
+		for (String S:arr){
+			file.println(S);
+		}
+		file.flush();
+		fileStream.close();
+		file.close();
+	}
+
+	public static void main(String[] args) throws IOException{
+
+	 final String  INPUTFILENAME = "NamesAndAges.txt";
+	 final String  OUTPUTFILENAME = "NamesAndAgesUpdated.txt";
+
+		ArrayList<String> userInputs;
 
 		//Get input
-		System.out.println("Opening file NamesAndAges.txt.");
+		userInputs = readInput(INPUTFILENAME);
-		fileByteStream = new FileInputStream("NamesAndAges.txt");
-		inFS = new Scanner(fileByteStream);
-
-		System.out.println("Reading in file and processing");
-
-		userInputs = getInput(inFS);
-
-
-		System.out.println("Closing scanner and writing out results " +
-				           "To NamesAndAgesUpdated.txt");
-		fileByteStream.close();
-		inFS.close();
 
 		//Write to file
-
+		writeArrayListToFile(userInputs, OUTPUTFILENAME);
-		FileOutputStream fileStream = null;
-		PrintWriter outFS = null;
-
-		fileStream = new FileOutputStream("NamesAndAgesUpdated.txt");
-		outFS = new PrintWriter(fileStream);
-
-		for (String S:userInputs){
-			outFS.println(S);
-		}
-		outFS.flush();
-		fileStream.close();
-		outFS.close();
 	}
 }
-

java/week8/exceptions-input-file/NamesAndAges.txt

@@ -2,4 +2,4 @@ Lee 18
 Lua 21
 Mary Beth 19
 Stu 33
--2
+-1

java/week8/exceptions-input-file/main.java

@@ -1,5 +1,7 @@
 import java.util.ArrayList;
 import java.util.Scanner;
+import java.io.FileInputStream;
+import java.io.IOException;
 /*
  * Same as the lab str vs int, except the input comes from a file
  * instead of the keyboard.
@@ -8,19 +10,26 @@ import java.util.Scanner;
 
 public class main {
 
-	public static void main(String[] args) {
+	public static void main(String[] args) throws IOException {
-		Scanner scnr = new Scanner(System.in);
+		FileInputStream fileByteStream = null; // File input stream
+		Scanner inFS = null;  				   // Scanner object
+
 		String s = "";
 		ArrayList<String> userInputs = new ArrayList<String>();
 		String name;
 		int age;
 
 		//Get input
-		while(s != "-1"){
+		System.out.println("Opening file NamesAndAges.txt.");
-			System.out.println("Enter a name and age. -1 to exit: ");
+		fileByteStream = new FileInputStream("NamesAndAges.txt");
+		inFS = new Scanner(fileByteStream);
+
+		System.out.println("Reading in file and processing");
+
+		while(true){
 
 			//Get name or exit
-			s = scnr.next();
+			s = inFS.next();
 
 			if (s.equals("-1")){
 				System.out.println();
@@ -33,7 +42,7 @@ public class main {
 			//Get age
 
 			try{
-				age = scnr.nextInt() +1;
+				age = inFS.nextInt() +1;
 			}
 			catch(Exception e){
 				System.out.println("Age must be an Integer\n" +
@@ -42,7 +51,7 @@ public class main {
 
 			}
 			//Finish line
-			scnr.nextLine();
+			inFS.nextLine();
 
 			//Add name plus new age to arr
 			userInputs.add(name + " " + Integer.toString(age));
@@ -50,6 +59,10 @@ public class main {
 			System.out.println();
 		}
 
+		System.out.println("Closing scanner and printing out results ");
+		fileByteStream.close();
+		inFS.close();
+
 		for (String S:userInputs){
 			System.out.println(S);
 		}