SHOW ME THE CODE !

[Daniel Duffy]

My conjecture is the value is 262537412640768743 + 1.

 

[ExSan]

My conjecture is the value is 262537412640768743 + 1.

I am working on it, I will post my output in a couple of minutes, seems that I found the problem

 

[ExSan]

This is an integer UNBELIEVABLE! isn't it!

NO, it is not an integer! Boost Multiprecision proves it

 

[Daniel Duffy]

Ramanujan's constant - OeisWiki

oeis.org

 

[ExSan]

Ramanujan's constant - OeisWiki

oeis.org

I got this
BOOST y = e ^ (pi * sqrt(163)) = 262537412640768183.98118196127384561629
the difference 183.98118196127384561629
all values expressed in terms of the boost library

 

[Daniel Duffy]

View attachment 34588
I got this
BOOST y = e ^ (pi * sqrt(163)) = 262537412640768183.98118196127384561629
the difference 183.98118196127384561629
all values expressed in terms of the boost library

My C++ Boost code gives
262537412640768743.999999999999250072597198185688879353856337336990862707537410378210647910118607313

which is correct.

This number was discovered in 1859 by the mathematician Charles Hermite.[7] In a 1975 April Fool article in Scientific American magazine,[8] "Mathematical Games" columnist Martin Gardner made the hoax claim that the number was in fact an integer, and that the Indian mathematical genius Srinivasa Ramanujan had predicted it—hence its name.

 

[ExSan]

My C++ Boost code gives
262537412640768743.999999999999250072597198185688879353856337336990862707537410378210647910118607313
which is correct.
This number was discovered in 1859 by the mathematician Charles Hermite.[7] In a 1975 April Fool article in Scientific American magazine,[8] "Mathematical Games" columnist Martin Gardner made the hoax claim that the number was in fact an integer, and that the Indian mathematical genius Srinivasa Ramanujan had predicted it—hence its name.

Probably It is.I will go over my code and increase the precision. What brings the attention of this problem is that standard library could give wrong results for particular cases, this could help to new C/C++ programmers. Best Regards Doctor Duffy, Stay at Home!

 

[Daniel Duffy]

If you run my code you get the correct answer Maybe you are mixing your types?

 

[ExSan]

I am using Microsoft Visual Studio Community 2019 Versión 16.6.3
Is the executable 64 bits? how to know, is there a C/C++/boost instruction to know the version of the compiled process?
How to set MVS IDE to output executable either 32 bit or 64 bit, is it possible?
I know that any CPU will give you a 64 bit process on win64; I need to load load a 32 bits DLL.
how can I force a 'x86' to a 32 bits process which has no issues loading 32 bits DLLs.

 

[ExSan]

-ExSan- is my own version of Excel. Console oriented, it's been coded using C++

 

[ExSan]

If you run my code you get the correct answer Maybe you are mixing your types?

Please share the code, I will copy / paste and find out my mistakes. THANKS Daniel!

 

[ExSan]

 

[ExSan]

Is there a way a C++ program can take advantage of a multicore processor?

 

[Daniel Duffy]

Is there a way a C++ program can take advantage of a multicore processor?

Newbie question..

Error - Cookies Turned Off

onlinelibrary.wiley.com

absolutely in C++11. threads, tasks and futures.

Discussed in my C++ 2018 book and QN Advanced C++ course.

Recommend doing some research.

//
Just got an 8-core machine today. What can I in heaven's name use it for? No idea.

 

[ExSan]

Newbie question..

Error - Cookies Turned Off

onlinelibrary.wiley.com

absolutely in C++11. threads, tasks and futures.

Discussed in my C++ 2018 book and QN Advanced C++ course.

Recommend doing some research.

//
Just got an 8-core machine today. What can I in heaven's name use it for? No idea.

That is a great machine the new one you have,
8 core =: 16 máximum numbers of threads.
reg instruction seems to be deprecated
Besides threads?
I have a program that is several K of source code (MS visual Studio 2019 - Windows) I was wondering how to tell the OS my program has a priority, something like in Unix/Linux.

 

[Daniel Duffy]

That is a great machine the new one you have,
8 core =: 16 máximum numbers of threads.
reg instruction seems to be deprecated
Besides threads?
I have a program that is several K of source code (MS visual Studio 2019 - Windows) I was wondering how to tell the OS my program has a priority, something like in Unix/Linux.

Yes, I'm in the lap of luxury.

Maybe Boost Process (heavyweights tasks)?

Chapter 30. Boost.Process - 1.76.0

www.boost.org

 

[ExSan]

 

[Daniel Duffy]

Code is undocumented

 

[Daniel Duffy]

    int xx = 2;
    int yy = xx++*++xx;
    int xx2 = 2;
    int yy2 = --xx2-++xx2;
    std::cout << "yy, yy2: " << yy << "," << yy2 << '\n';

 

[ExSan]

Code is undocumented

Very important observacion, I will fix it.
I am always eager to learn from you!
Thanks Doctor Duffy
Best Regards