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Raghuwarna_19/Command_Line_Arg.cpp

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+#include <iostream>
+
+int main(int argc, char* argv[]) {
+    std::cout << "Number of arguments: " << argc << std::endl;
+
+    for (int i = 0; i < argc; ++i) {
+        std::cout << "Argument " << i << ": " << argv[i] << std::endl;
+    }
+
+    return 0;
+}

Raghuwarna_19/Error_Handling.cpp

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+#include <iostream>
+#include <fstream>
+#include <string>
+
+void readFile(const std::string& filename) {
+    std::ifstream file;
+    file.open(filename);
+
+    if (!file.is_open()) {
+        throw std::runtime_error("Error: Unable to open file.");
+    }
+
+    std::string line;
+    while (std::getline(file, line)) {
+        std::cout << line << std::endl;
+    }
+
+    file.close();
+}
+
+int main() {
+    std::string filename = "example.txt";
+
+    try {
+        readFile(filename);
+    } catch (const std::exception& e) {
+        std::cerr << "Exception caught: " << e.what() << std::endl;
+    }
+
+    return 0;
+}

Raghuwarna_19/Extraction_Insertion.cpp

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+#include <iostream>
+using namespace std;
+
+class ComplexNumber {
+private:
+    double real;
+    double imaginary;
+
+public:
+    ComplexNumber(double r = 0, double i = 0) : real(r), imaginary(i) {}
+
+    friend ostream& operator<<(ostream& os, const ComplexNumber& cn) {
+        os << cn.real << " + " << cn.imaginary << "i";
+        return os;
+    }
+
+    friend istream& operator>>(istream& is, ComplexNumber& cn) {
+        cout << "Enter real part: ";
+        is >> cn.real;
+        cout << "Enter imaginary part: ";
+        is >> cn.imaginary;
+        return is;
+    }
+};
+
+int main() {
+    ComplexNumber cn1;
+    cout << "Enter a complex number:" << endl;
+    cin >> cn1;
+    cout << "The complex number is: " << cn1 << endl;
+
+    return 0;
+}

Raghuwarna_19/File_Pointer.cpp

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+#include <iostream>
+#include <fstream>
+
+int main() {
+    std::ofstream file("example.txt"); 
+
+    if (file.is_open()) {
+        file << "Hello, File Pointers!"; 
+        file.close(); 
+    } else {
+        std::cout << "Unable to open file";
+    }
+
+    std::ifstream readFile("example.txt"); 
+
+    if (readFile.is_open()) {
+        std::string content;
+        while (getline(readFile, content)) {
+            std::cout << content << std::endl; 
+        }
+        readFile.close(); 
+    } else {
+        std::cout << "Unable to open file";
+    }
+
+    return 0;
+}