Qt project file


#-------------------------------------------------

#

# Project created by QtCreator 2010-10-01T15:39:17

#

#-------------------------------------------------

QT       += core

QT       -= gui

unix:INCLUDEPATH += ../../Libraries/bigint-2010.04.30

win32:INCLUDEPATH += ../../Libraries/bigint-2010.04.30

TARGET = CppHelloBigInt

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

unix: SOURCES += \

  ../../Libraries/bigint-2010.04.30/BigInteger.cc \

  ../../Libraries/bigint-2010.04.30/BigIntegerAlgorithms.cc \

  ../../Libraries/bigint-2010.04.30/BigIntegerUtils.cc \

  ../../Libraries/bigint-2010.04.30/BigUnsigned.cc \

  ../../Libraries/bigint-2010.04.30/BigUnsignedInABase.cc \

  main.cpp

win32: SOURCES += \

  ../../Libraries/bigint-2010.04.30/BigInteger.cc \

  ../../Libraries/bigint-2010.04.30/BigIntegerAlgorithms.cc \

  ../../Libraries/bigint-2010.04.30/BigIntegerUtils.cc \

  ../../Libraries/bigint-2010.04.30/BigUnsigned.cc \

  ../../Libraries/bigint-2010.04.30/BigUnsignedInABase.cc \

  main.cpp

main.cpp


// Sample program demonstrating the use of the Big Integer Library.

// Standard libraries

#include <string>

#include <iostream>



// 'BigIntegerLibrary.hh' includes all of the library headers.

#include "BigIntegerLibrary.hh"



int main() {

  /* The library throws 'const char *' error messages when things go

   * wrong.  It's a good idea to catch them using a 'try' block like this

   * one.  Your C++ compiler might need a command-line option to compile

   * code that uses exceptions. */

  try {

    BigInteger a; // a is 0

    int b = 535;



    /* Any primitive integer can be converted implicitly to a

     * BigInteger. */

    a = b;



    /* The reverse conversion requires a method call (implicit

     * conversions were previously supported but caused trouble).

     * If a were too big for an int, the library would throw an

     * exception. */

    b = a.toInt();



    BigInteger c(a); // Copy a BigInteger.



    // The int literal is converted to a BigInteger.

    BigInteger d(-314159265);



    /* This won't compile (at least on 32-bit machines) because the

     * number is too big to be a primitive integer literal, and

     * there's no such thing as a BigInteger literal. */

    //BigInteger e(3141592653589793238462643383279);



    // Instead you can convert the number from a string.

    std::string s("3141592653589793238462643383279");

    BigInteger f = stringToBigInteger(s);



    // You can convert the other way too.

    std::string s2 = bigIntegerToString(f);



    // f is implicitly stringified and sent to std::cout.

    std::cout << f << std::endl;



    /* Let's do some math!  The library overloads most of the

     * mathematical operators (including assignment operators) to

     * work on BigIntegers.  There are also ''copy-less''

     * operations; see 'BigUnsigned.hh' for details. */



    // Arithmetic operators

    BigInteger g(314159), h(265);

    std::cout << (g + h) << '\n'

      << (g - h) << '\n'

      << (g * h) << '\n'

      << (g / h) << '\n'

      << (g % h) << std::endl;



    // Bitwise operators

    BigUnsigned i(0xFF0000FF), j(0x0000FFFF);

    // The library's << operator recognizes base flags.

    std::cout.flags(std::ios::hex | std::ios::showbase);

    std::cout << (i & j) << '\n'

      << (i | j) << '\n'

      << (i ^ j) << '\n'

      // Shift distances are ordinary unsigned ints.

      << (j << 21) << '\n'

      << (j >> 10) << '\n';

    std::cout.flags(std::ios::dec);



    // Let's do some heavy lifting and calculate powers of 314.

    int maxPower = 10;

    BigUnsigned x(1), big314(314);

    for (int power = 0; power <= maxPower; power++) {

      std::cout << "314^" << power << " = " << x << std::endl;

      x *= big314; // A BigInteger assignment operator

    }



    // Some big-integer algorithms (albeit on small integers).

    std::cout << gcd(BigUnsigned(60), 72) << '\n'

      << modinv(BigUnsigned(7), 11) << '\n'

      << modexp(BigUnsigned(314), 159, 2653) << std::endl;



    // Add your own code here to experiment with the library.

  } catch(char const* err) {

    std::cout << "The library threw an exception:\n"

      << err << std::endl;

  }



  return 0;

}



/*

The original sample program produces this output:



3141592653589793238462643383279

314424

313894

83252135

1185

134

0xFF

0xFF00FFFF

0xFF00FF00

0x1FFFE00000

0x3F

314^0 = 1

314^1 = 314

314^2 = 98596

314^3 = 30959144

314^4 = 9721171216

314^5 = 3052447761824

314^6 = 958468597212736

314^7 = 300959139524799104

314^8 = 94501169810786918656

314^9 = 29673367320587092457984

314^10 = 9317437338664347031806976

12

8

1931



*/

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) 'Hello BigInt' using Qt Creator under Ubuntu

Qt project file

main.cpp