add fstream demo

Author: tbhaxor

CMakeLists.txt

@@ -11,4 +11,5 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 add_subdirectory(WritingFile)
 add_subdirectory(ReadingFile)
 add_subdirectory(AppendingFile)
-add_subdirectory(BinaryFile)
+add_subdirectory(BinaryFile)
+add_subdirectory(FileRW)

FileRW/CMakeLists.txt

@@ -0,0 +1,3 @@
+project(FileRW)
+
+add_executable(${PROJECT_NAME} main.cpp)

FileRW/main.cpp

@@ -0,0 +1,54 @@
+#include <fstream>
+#include <iostream>
+#include <limits>
+#include <string>
+
+int main(void) {
+  std::string opt;
+  std::fstream *file = new std::fstream();
+
+  // open file in append and read mode
+  file->open("file.txt", std::ios::app | std::ios::in);
+  if (!file->is_open()) {
+    std::cerr << "Unable to open file\n";
+
+    delete file;
+    file = nullptr;
+    return 0x0;
+  }
+
+  do {
+    std::cout << "Menu\n(W)rite\n(R)ead\n(Q)uit\n> ";
+    std::getline(std::cin, opt);
+
+    if (opt == "w" || opt == "W") {
+      // clear flags and set put cursor at eof
+      file->clear();
+      file->seekp(std::ios::end);
+
+      std::string data;
+      std::cout << "Enter string: ";
+      std::getline(std::cin, data);
+      *file << data << std::endl;
+    } else if (opt == "r" || opt == "R") {
+      // clear flag and set get cursor at begining of file
+      file->clear();
+      file->seekg(std::ios::beg);
+
+      std::string data;
+
+      // read until hit eof and print
+      std::getline(*file, data);
+      while (!file->eof()) {
+        std::cout << data << std::endl;
+        std::getline(*file, data);
+      }
+    }
+  } while (opt != "q" || opt == "Q");
+
+  file->close(); // close file handle
+
+  delete file;
+  file = nullptr;
+  return 0x0;
+}