Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

GUI application

C++ standard:

C++11

Compiler(s):

G++ 4.9.2

Libraries used:

Qt: version 5.4.1 (32 bit)
STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppStdFgetsExample2/CppStdFgetsExample2.pro


exists(../../ConsoleApplication.pri) {

  include(../../ConsoleApplication.pri)

}

!exists(../../ConsoleApplication.pri) {

  QT += core

  QT += gui

  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

  CONFIG   += console

  CONFIG   -= app_bundle

  TEMPLATE = app

  CONFIG(release, debug|release) {

    DEFINES += NDEBUG NTRACE_BILDERBIKKEL

  }

  QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

  unix {

    QMAKE_CXXFLAGS += -Werror

  }

}



SOURCES += main.cpp

./CppStdFgetsExample2/main.cpp


#include <cassert>

#include <fstream>

#include <iostream>



int main()

{

  const std::string filename = "tmp.txt";

  {

    std::ofstream file(filename.c_str());

    const int zero = 0;

    file

      << zero << '\n'

      << 0 << '\n'

      << 1 << '\n'

      << 2 << '\n'

      << 3 << '\n'

      << 4 << '\n'

      << 5 << '\n'

      << 6 << '\n'

      << 7 << '\n'

      << 8 << '\n'

      << 9 << '\n'

      << 0 << '\n'

      << zero;

  }



  std::FILE* const file = std::fopen(filename.c_str(),"r");

  const std::FILE * const file_before = file;



  const int buffer_size = 8;

  char buffer[buffer_size];

  for (int i=0; ; ++i)

  {

    if (!std::fgets(buffer, buffer_size, file)) break;

    std::cout << i << ": <before>" << buffer << "<after>" << '\n';



    assert(file_before == file

      && "Magic: the file is read sequential, yet file remains the same");

  }

}



/* Screen output



0: <before>0

<after>

1: <before>0

<after>

2: <before>1

<after>

3: <before>2

<after>

4: <before>3

<after>

5: <before>4

<after>

6: <before>5

<after>

7: <before>6

<after>

8: <before>7

<after>

9: <before>8

<after>

10: <before>9

<after>

11: <before>0

<after>

12: <before>0<after>

Press <RETURN> to close this window...





*/

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(C++) StdFgetsExample2

Technical facts

Qt project file: ./CppStdFgetsExample2/CppStdFgetsExample2.pro

./CppStdFgetsExample2/main.cpp