Updated TextFileIO activity for CLion

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.23)
+project(TEACH_T08_TextFileIO)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(TEACH_T08_TextFileIO main.cpp)

input.txt

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+this is text
+from inside
+input.txt
+hello text file input!

inputdata.txt

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+0 5.2
+2 1.3
+4 13.4
+6 1.5
+8 5.6
+10 6.7
+12 7.7
+14 8.8
+16 9.9
+18 10.1

main.cpp

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+
+// Text file input and output
+// Chris Bass
+// Updated October 2019
+
+// note: requires C++17 for the filesystem library
+// in VS2019 project > C/C++ > properties > language > C++ language standard > C++17 or above
+// in CLion > Edit Run Configurations... > Working Directory > Insert Macros... > $ProjectFileDir$
+
+#include <iostream>
+#include <iomanip>
+#include <fstream>
+#include <string>
+#include <filesystem>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+    cout << "being exectued from:" << endl;
+    cout << argv[0] << endl;
+
+    std::filesystem::path cwd = std::filesystem::current_path() / "filename.txt"; // C++17
+    cout << "but the input.txt and output.txt files should be be in the following directory:" << endl;
+    cout << cwd.string() << endl << endl;
+
+    // writing to a text file using an output file stream object
+    {
+        cout << "--writing to output.txt started--" << endl;
+
+        ofstream outputFileStream;
+
+        outputFileStream.open("output.txt");
+        outputFileStream << "Hello text file!" << endl;
+        outputFileStream << "This will be inside output.txt" << endl;
+        outputFileStream.close();
+
+        cout << "--writing to output.txt finished--" << endl << endl;
+    }
+
+    // reading from a text file using an input file stream object
+    {
+        cout << "--reading from input.txt started--" << endl;
+
+        ifstream inputFileStream;
+
+        inputFileStream.open("input.txt");
+
+        if (inputFileStream.good()) {
+            cout << "Input file is good start processing" << endl;
+
+            char inputChar = inputFileStream.get();
+
+            while (!inputFileStream.fail()) {
+                cout << inputChar;
+                inputChar = inputFileStream.get();
+            }
+
+            cout << endl;
+
+            if (inputFileStream.eof())
+                cout << "Reached the end of file marker" << endl;
+            else
+                cout << "Error in input file" << endl;
+        } else {
+            cout << "Error opening input file, ";
+            cout << "check 'input.txt' exists in correct directory" << endl;
+        }
+
+
+        inputFileStream.close();
+
+        cout << "--reading from input.txt finished--" << endl << endl;
+    }
+
+    // reading from a text file using an input file stream object
+    // this uses std::string
+    {
+        cout << "--reading from input.txt started--" << endl;
+
+        ifstream inputFileStream;
+
+        inputFileStream.open("input.txt");
+
+        if (inputFileStream.good()) {
+            cout << "Input file is good start processing" << endl;
+
+            string inputString;
+
+            inputFileStream >> inputString;
+
+            while (!inputFileStream.fail()) {
+                cout << inputString << ";";
+                inputFileStream >> inputString;
+            }
+
+            cout << endl;
+
+            if (inputFileStream.eof())
+                cout << "Reached the end of file marker" << endl;
+            else
+                cout << "Error in input file" << endl;
+        } else {
+            cout << "Error opening input file, ";
+            cout << "check 'input.txt' exists in correct directory" << endl;
+        }
+
+        inputFileStream.close();
+
+        cout << "--reading from input.txt finished--" << endl << endl;
+    }
+
+    // reading from a text file using an input file stream object
+    // this assumes the data in the text file is in the format of:
+    // int double int double int double...
+    {
+        cout << "--reading from inputdata.txt started--" << endl;
+
+        ifstream inputFileStream;
+
+        inputFileStream.open("inputdata.txt");
+
+        if (inputFileStream.good()) {
+            int rowCounter = 1;
+            int var1;
+            double var2;
+
+            inputFileStream >> var1;
+
+            while (!inputFileStream.fail()) {
+                cout << "row" << setw(3) << rowCounter;
+                cout << "   var1 = " << setw(3) << var1;
+                rowCounter++;
+
+                inputFileStream >> var2;
+                if (!inputFileStream.fail()) {
+                    cout << "   var2 = " << setw(5) << var2;
+                    inputFileStream >> var1;
+                }
+                cout << endl;
+            }
+
+            if (inputFileStream.eof())
+                cout << "Reached the end of file marker" << endl;
+            else
+                cout << "Error whilst reading input file" << endl;
+        } else {
+            cout << "Error opening input file, ";
+            cout << "check 'inputdata.txt' exists in correct directory" << endl;
+        }
+
+        inputFileStream.close();
+
+        cout << "--reading from inputdata.txt finished--" << endl << endl;
+    }
+
+    cout << "End of program" << endl;
+
+    return 0;
+}

output.txt

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+Hello text file!
+This will be inside output.txt