added challenge 20 chapter 10

Chapter-10-Characters-C-Strings-and-More-about-the-string-Class/Programming Challenges/20-display-most-common.cpp

@@ -0,0 +1,124 @@
+/**
+ * In the student sample programs for this book, you will find a file named pbnumbers.txt,
+ * containing the winning lottery numbers that were selected between February 3, 2010
+ * and May 11, 2016 (the file contains 654 sets of winning numbers). Here is an example of the first
+ * few lines of the file's contents:
+ * 17 22 36 37 52 24
+ * 14 22 52 54 59 04
+ * 05 08 29 37 38 34
+ * 10 14 30 40 51 01
+ * 07 08 19 26 36 15
+ * and so on...
+ *
+ * Each line in the file contains the set of six numbers that were selected on a given date.
+ * The numbers are separated by a space, and the last number in each line is the PowerBall
+ * number for the day. For example, the first line in the file shows the numbers for February 3, 2010,
+ * which are 17, 22, 36, 37, 52, and the PowerBall number 24.
+ *
+ * Write one or more programs that work with this file to perform the following:
+ *
+ * - Display the 10 most common numbers, ordered by frequency.
+ * - Display the 10 least common numbers, ordered by frequency.
+ * - Display the 10 most overdue numbers (numbers that haven't been
+ *      drawn in a long time), ordered from most overdue to least overdue.
+ * - Display the frequency of each number 1-69, and the frequency of each Powerball
+ *      number 1-26.
+ *
+ **/
+
+#include <iostream>
+#include <fstream>
+#include <string>
+
+using namespace std;
+
+const int ROWS = 654,
+          COLUMNS = 6;
+
+void readArrayContents(int [][COLUMNS]);
+
+int main()
+{
+
+    string array_from_file[ROWS][COLUMNS];
+
+    ifstream input_file;
+
+    input_file.open("pbnumbers.txt");
+
+    if (input_file)
+    {
+        cout << "File open" << endl;
+
+        for (int row = 0; row < ROWS; row++)
+        {
+            for (int column = 0; column < COLUMNS; column++)
+            {
+                if (!(input_file >> array_from_file[row][column]))
+                {
+                    cout << "Invalid file. See line #" << __LINE__ << endl << endl;
+                    exit(EXIT_FAILURE);
+                }
+
+            }
+
+        }
+
+        input_file.close();
+        cout << "File closed." << endl;
+
+    }
+    else
+    {
+        cout << "Invalid file. See line #" << __LINE__ << endl << endl;
+        exit(EXIT_FAILURE);
+    }
+
+
+
+
+    int array_of_ints_from_file[ROWS][COLUMNS];
+
+    for (int row = 0; row < ROWS; row++)
+    {
+        for (int column = 0; column < COLUMNS; column++)
+        {
+            array_of_ints_from_file[row][column] = stoi(array_from_file[row][column]);
+        }
+
+    }
+
+    //  - Find 10 most common numbers 
+    const int ALL_NUMBERS_INDEX = ROWS * COLUMNS;
+    int all_numbers[ALL_NUMBERS_INDEX];
+
+    for (int i = 0; i < ALL_NUMBERS_INDEX; i++)
+    {
+        /* code */
+    }
+
+
+
+    //  - Display the 10 most common numbers, ordered by frequency. get total numbers
+
+
+    //  - Read contents of int array
+    readArrayContents(array_of_ints_from_file);
+
+
+    return 0;
+}
+
+void readArrayContents(int array[][COLUMNS])
+{
+    for (int row = 0; row < ROWS; row++)
+    {
+        cout << row + 1 << ". ";
+
+        for (int column = 0; column < COLUMNS; column++)
+        {
+            cout << array[row][column] << " ";
+        }
+        cout << endl;
+    }
+}

Chapter-10-Characters-C-Strings-and-More-about-the-string-Class/Programming Challenges/20-read-into-array.cpp

@@ -0,0 +1,93 @@
+/**
+ * In the student sample programs for this book, you will find a file named pbnumbers.txt,
+ * containing the winning lottery numbers that were selected between February 3, 2010
+ * and May 11, 2016 (the file contains 654 sets of winning numbers). Here is an example of the first
+ * few lines of the file's contents:
+ * 17 22 36 37 52 24
+ * 14 22 52 54 59 04
+ * 05 08 29 37 38 34
+ * 10 14 30 40 51 01
+ * 07 08 19 26 36 15
+ * and so on...
+ *
+ * Each line in the file contains the set of six numbers that were selected on a given date.
+ * The numbers are separated by a space, and the last number in each line is the PowerBall
+ * number for the day. For example, the first line in the file shows the numbers for February 3, 2010,
+ * which are 17, 22, 36, 37, 52, and the PowerBall number 24.
+ *
+ * Write one or more programs that work with this file to perform the following:
+ *
+ * - Display the 10 most common numbers, ordered by frequency.
+ * - Display the 10 least common numbers, ordered by frequency.
+ * - Display the 10 most overdue numbers (numbers that haven't been
+ *      drawn in a long time), ordered from most overdue to least overdue.
+ * - Display the frequency of each number 1-69, and the frequency of each Powerball
+ *      number 1-26.
+ *
+ **/
+
+#include <iostream>
+#include <fstream>
+#include <string>
+
+using namespace std;
+
+int main()
+{
+    const int ROWS = 654,
+              COLUMNS = 6;
+
+    string array_from_file[ROWS][COLUMNS];
+
+    ifstream input_file;
+
+    input_file.open("pbnumbers.txt");
+
+    if (input_file)
+    {
+        cout << "File open" << endl;
+
+        // Display the 10 most common numbers, ordered by frequency.
+        for (int row = 0; row < ROWS; row++)
+        {
+            for (int column = 0; column < COLUMNS; column++)
+            {
+                if (!(input_file >> array_from_file[row][column]))
+                {
+                    cout << "Invalid file. See line #" << __LINE__ << endl << endl;
+                    exit(EXIT_FAILURE);
+                }
+
+            }
+
+        }
+
+
+        input_file.close();
+        cout << "File closed." << endl;
+
+    }
+    else
+    {
+        cout << "Invalid file. See line #" << __LINE__ << endl << endl;
+        exit(EXIT_FAILURE);
+    }
+
+    //  - Read contents of array
+    for (int row = 0; row < ROWS; row++)
+    {
+        cout << row + 1 << ". ";
+
+        for (int column = 0; column < COLUMNS; column++)
+        {
+            cout << array_from_file[row][column] << " ";
+        }
+        cout << endl;
+    }
+
+    //  - Display the 10 most common numbers, ordered by frequency.
+
+
+
+    return 0;
+}