feat: complete chapter2 labs{1,2,3}

meson.build

@@ -7,3 +7,14 @@ project(
 
 c_1_lab_1 = executable('c_1_lab_1', 'src/chapter_1/c_1_lab_1.cpp', install: true)
 c_1_ice_1 = executable('c_1_ice_1', 'src/chapter_1/c_1_ice_1.cpp', install: true)
+
+c_2_lab_1 = executable('c_2_lab_1', 'src/chapter_2/lab_1/main.cpp', install: true)
+c_2_lab_1_arg = executable(
+  'c_2_lab_1_arg',
+  'src/chapter_2/lab_1/main.cpp',
+  install: true,
+  cpp_args: ['-DCHECK_ARG'],
+)
+
+c_2_lab_2 = executable('c_2_lab_2', 'src/chapter_2/lab_2/main.cpp', install: true)
+c_2_lab_3 = executable('c_2_lab_3', 'src/chapter_2/lab_3/main.cpp', install: true)

src/chapter_2/lab_1/lab2part1.dat

@@ -0,0 +1,3 @@
+10 20 30
+56 6 8 9 11
+12 34 87 3

src/chapter_2/lab_1/lab2part1a.txt

@@ -0,0 +1 @@
+1 2 3 4 5 6 -1 -2 -3

src/chapter_2/lab_1/main.cpp

@@ -0,0 +1,62 @@
+#include <cstdlib> //needed for exit function
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+// Place fileSum prototype (declaration) here
+int fileSum(string filename);
+
+int main(int argc, char *argv[]) {
+
+  string filename;
+
+#ifdef CHECK_ARG // This is a flag to the compiler to include this code if
+                 // CHECK_ARG is defined
+  if (argc < 2) {
+    cout
+        << "Please enter a file on the command line\n"; // Too little arguements
+    exit(1);
+  }
+  if (argc > 2) {
+    cout << "Too many arguements! Only 1 file is expected\n"; // Too many
+                                                              // arguements
+    exit(1);
+  }
+  filename =
+      argv[1]; // set the file name to the second element in the command line
+#endif
+#ifndef CHECK_ARG // This is a flag to the compiler to include this code if
+                  // CHECK_ARG is NOT defined
+  cout << "Enter the name of the input file: ";
+  cin >> filename; // set the file name to what the user inputs (interactive)
+  cout << "\n";
+#endif
+
+  int sum = 0;
+  sum = fileSum(filename);
+
+  cout << "Sum: " << sum << endl;
+
+  return 0;
+}
+
+// Place fileSum implementation here
+int fileSum(string filename) {
+  fstream file;
+  file.open(filename);
+
+  if (!file.is_open()) {
+    cout << "Error opening " << filename << endl;
+    exit(EXIT_FAILURE);
+  }
+
+  int num;
+  int sum = 0;
+
+  while (file >> num) {
+    sum += num;
+  }
+
+  return sum;
+}

src/chapter_2/lab_2/alpha.txt

@@ -0,0 +1 @@
+abcdefghijklmnopqrstuvwxyz

src/chapter_2/lab_2/main.cpp

@@ -0,0 +1,47 @@
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+// Place charCnt prototype (declaration) here
+int charCnt(string filename, char ch);
+
+int main() {
+  string filename;
+  char ch;
+  int chCnt = 0;
+
+  cout << "Enter the name of the input file: ";
+  cin >> filename;
+  cout << endl;
+  cout << "Enter a character: ";
+  cin.ignore(); // ignores newline left in stream after previous input statement
+  cin.get(ch);
+  cout << endl;
+
+  chCnt = charCnt(filename, ch);
+  cout << "# of " << ch << "'s: " << chCnt << endl;
+
+  return 0;
+}
+
+// Place charCnt implementation here
+int charCnt(string filename, char ch) {
+  fstream file = fstream(filename);
+
+  if (!file.is_open()) {
+    cout << "Error opening " << filename << endl;
+    exit(EXIT_FAILURE);
+  }
+
+  int count = 0;
+  char currentCh;
+
+  while (file.get(currentCh)) {
+    if (currentCh == ch)
+      count++;
+  }
+
+  return count;
+}

src/chapter_2/lab_3/data1.csv

@@ -0,0 +1 @@
+1,2,3,4,5,6

src/chapter_2/lab_3/data2.csv

@@ -0,0 +1 @@
+6,4,8,10

src/chapter_2/lab_3/main.cpp

@@ -0,0 +1,79 @@
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <numeric>
+#include <sstream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+  string inputFile;
+  string outputFile;
+
+  // Assign to inputFile value of 2nd command line argument
+  // Assign to outputFile value of 3rd command line argument
+  inputFile = argv[1];
+  outputFile = argv[2];
+
+  // Create input stream and open input csv file.
+  ifstream input(inputFile);
+
+  // Verify file opened correctly.
+  // Output error message and return 1 if file stream did not open correctly.
+  if (!input.is_open()) {
+    cout << "Error opening " << inputFile << endl;
+    return 1;
+  }
+
+  // Read in integers from input file to vector.
+  string line;
+  getline(input, line);
+
+  vector<int> values;
+  stringstream ss(line);
+  string value;
+
+  while (getline(ss, value, ',')) {
+    values.push_back(stoi(value));
+  }
+
+  // Close input stream.
+  input.close();
+
+  // Get integer average of all values read in.
+  int sum = std::accumulate(values.begin(), values.end(), 0);
+  int average = sum / static_cast<int>(values.size());
+
+  // Convert each value within vector to be the difference between the original
+  // value and the average.
+  for_each(values.begin(), values.end(),
+           [average](int &num) { num -= average; });
+
+  // Create output stream and open/create output csv file.
+  ofstream output(outputFile);
+
+  // Verify file opened or was created correctly.
+  // Output error message and return 1 if file stream did not open
+  // correctly.
+  if (!output.is_open()) {
+    cout << "Error opening " << outputFile << endl;
+    return 1;
+  }
+
+  // Write converted values into output csv file, each integer separated by
+  // a comma.
+  for (unsigned int i = 0; i < values.size(); i++) {
+    output << values[i];
+    if (i < values.size() - 1) {
+      output << ",";
+    }
+  }
+
+  // Close output stream.
+  output.close();
+
+  return 0;
+}

src/chapter_2/lab_3/out1.csv

@@ -0,0 +1 @@
+-2,-1,0,1,2,3