feat: finish lab 5-1

meson.build

@@ -38,3 +38,9 @@ c_4_program_3 = executable(
   ],
   install: true,
 )
+
+c_5_lab_5_1 = executable(
+  'c_5_lab_5-1',
+  ['src/chapter_5/lab_5-1/main.cpp'],
+  install: true,
+)

src/chapter_5/lab_5-1/main.cpp

@@ -0,0 +1,111 @@
+// include any standard libraries needed
+#include <fstream>
+#include <iostream>
+
+//  - Passes in an array along with the size of the array.
+//  - Returns the mean of all values stored in the array.
+double mean(const double array[], int arraySize) {
+  double sum = 0;
+  for (int i = 0; i < arraySize; i++) {
+    sum += array[i];
+  }
+  return sum / arraySize;
+}
+
+//  - Passes in an array, the size of the array by reference, and the index of a
+//  value to be removed from the array.
+//  - Removes the value at this index by shifting all of the values after this
+//  value up, keeping the same relative order of all values not removed.
+//  - Reduces arraySize by 1.
+void remove(double array[], int &arraySize, int index) {
+  if (index >= arraySize) {
+    return;
+  }
+  for (int i = index; i < arraySize - 1; i++) {
+    array[i] = array[i + 1];
+  }
+  arraySize--;
+}
+
+// - Passes in an array and the size of the array.
+// - Outputs each value in the array separated by a comma and space, with no
+// comma, space or newline at the end.
+void display(const double array[], int arraySize) {
+  for (int i = 0; i < arraySize - 1; i++) {
+    std::cout << array[i] << ", ";
+  }
+  std::cout << array[arraySize - 1];
+}
+
+const int ARR_CAP = 100;
+
+int main(int argc, char *argv[]) {
+
+  // verify file name provided on command line
+  if (argc < 2) {
+    std::cout << "provide the file name" << std::endl;
+    return 1;
+  }
+
+  // open file and verify it opened
+  std::fstream file = std::fstream(argv[1]);
+  if (!file.is_open()) {
+    std::cout << "file does not exist or could not be opened" << std::endl;
+    return 1;
+  }
+
+  // Declare an array of doubles of size ARR_CAP.
+  double arr[ARR_CAP];
+
+  // Fill the array with up to ARR_CAP doubles from the file entered at the
+  // command line.
+  double temp;
+  int i = 0;
+  while (file >> temp) {
+    if (i >= ARR_CAP)
+      break;
+
+    arr[i] = temp;
+    i++;
+  }
+
+  int arr_actual_size = i;
+
+  if (i < ARR_CAP) {
+    for (; i < ARR_CAP; i++) {
+      arr[i] = 0;
+    }
+  }
+
+  // Call the mean function passing it this array and output the
+  // value returned.
+
+  std::cout << "Mean: " << mean(arr, arr_actual_size) << std::endl << std::endl;
+
+  // Ask the user for the index (0 to size - 1) of the value they want to
+  // remove.
+  int user_idx;
+  std::cout << "Enter index of value to be removed (0 to "
+            << arr_actual_size - 1 << "): " << std::endl;
+  std::cin >> user_idx;
+
+  // Call the display function to output the array.
+  std::cout << "Before removing value: ";
+  display(arr, arr_actual_size);
+  std::cout << std::endl;
+
+  // Call the remove function to remove the value at the index
+  // provided by the user.
+  remove(arr, arr_actual_size, user_idx);
+
+  // Call the display function again to output the array
+  // with the value removed.
+  std::cout << "After removing value: ";
+  display(arr, arr_actual_size);
+  std::cout << std::endl;
+
+  // Call the mean function again to get the new mean
+  std::cout << "Mean: " << mean(arr, arr_actual_size);
+
+  return 0;
+}

src/chapter_5/lab_5-1/one_hundred.dat

@@ -0,0 +1,18 @@
+10 2 4
+3 9 8.1
+2 5.6
+8.1 9 3.0 4.67 8 2
+8 4 2 1 19 29.32
+
+4 5 9.1 9 2 3.1
+8 4 1 2 1.2 9.45
+8 4 3 3 2.12 3
+9
+11
+
+-2.3 4 2 8 9 11 21.3 9 4 9 1
+8 2 9 0.45 4.5 2 1 9 5.4
+
+4 5 6 3 2 9 5 6.3 -16 5 9 2 0.3 34 5 2.1 6 8.7 9.23 10
+
+5 9 3.2 5.67 -9.8 2 3 9 4.5 2.89 4 8 7 21 -43.2 5.2 9 8 2.0 

src/chapter_5/lab_5-1/seven.dat

@@ -0,0 +1 @@
+-1 -2 3 4 9 2 7