Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppBoostFormatExample2/CppBoostFormatExample2.pro


include(../../ConsoleApplication.pri) #Or use the code below

# 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

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }



SOURCES += main.cpp

./CppBoostFormatExample2/main.cpp


#include <cassert>

#include <cmath>

#include <cstdio>

#include <iostream>

#include <iomanip>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <boost/format.hpp>

#include <boost/lexical_cast.hpp>

#pragma GCC diagnostic pop





//Format a double to a std::string with one

//digit behind the comma

const std::string MyCustomFormat(const double x)

{

  std::stringstream s;

  s << std::setprecision(1) << std::fixed << x;

  const std::string t = s.str();

  return t;

}



int main()

{

  assert(MyCustomFormat( 123456.7890) == "123456.8");

  assert(MyCustomFormat(  12345.6789) ==  "12345.7");

  assert(MyCustomFormat(   1234.5678) ==   "1234.6");

  assert(MyCustomFormat(    123.4567) ==    "123.5");

  assert(MyCustomFormat(     12.3456) ==     "12.3");

  assert(MyCustomFormat(      1.2345) ==      "1.2");

  assert(MyCustomFormat(      0.1234) ==      "0.1");

  assert(MyCustomFormat(      0.0123) ==      "0.0");

  assert(MyCustomFormat(      0.0012) ==      "0.0");

  assert(MyCustomFormat(      0.0001) ==      "0.0");

  assert(MyCustomFormat(      0.0000) ==      "0.0");

  assert(MyCustomFormat(        0.99) ==      "1.0");



  assert(MyCustomFormat(-123456.7890) == "-123456.8");

  assert(MyCustomFormat( -12345.6789) ==  "-12345.7");

  assert(MyCustomFormat(  -1234.5678) ==   "-1234.6");

  assert(MyCustomFormat(   -123.4567) ==    "-123.5");

  assert(MyCustomFormat(    -12.3456) ==     "-12.3");

  assert(MyCustomFormat(     -1.2345) ==      "-1.2");

  assert(MyCustomFormat(     -0.1234) ==      "-0.1");

  assert(MyCustomFormat(     -0.0123) ==      "-0.0");

  assert(MyCustomFormat(     -0.0012) ==      "-0.0");

  assert(MyCustomFormat(     -0.0001) ==      "-0.0");

  assert(MyCustomFormat(     -0.0000) ==      "-0.0");

  assert(MyCustomFormat(       -0.99) ==      "-1.0");



  //Now do the same with boost::format...

  assert(!"TODO");

}

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(C++) BoostFormatExample2

Technical facts

Qt project file: ./CppBoostFormatExample2/CppBoostFormatExample2.pro

./CppBoostFormatExample2/main.cpp