Exact decimal datatype for C++?

by

The Boost.Multiprecision library has a decimal based floating point template class called cpp_dec_float, for which you can specify any precision you want.

#include <iostream>
#include <iomanip>
#include <boost/multiprecision/cpp_dec_float.hpp>

int main()
{
    namespace mp = boost::multiprecision;
    // here I'm using a predefined type that stores 100 digits,
    // but you can create custom types very easily with any level
    // of precision you want.
    typedef mp::cpp_dec_float_100 decimal;

    decimal tiny("0.0000000000000000000000000000000000000000000001");
    decimal huge("100000000000000000000000000000000000000000000000");
    decimal a = tiny;         

    while (a != huge)
    {
        std::cout.precision(100);
        std::cout << std::fixed << a << '\n';
        a *= 10;
    }    
}

More Related Contents:

  1. C++ decimal data types
  2. why float and double does not identify 0 in decimal places [duplicate]
  3. c++ Making a code that displays equations and keep getting the “expression must have integral or unscoped enum type” error
  4. Creation of simple types in c++
  5. What are POD types in C++?
  6. Size of character (‘a’) in C/C++
  7. When should I use double instead of decimal?
  8. How to handle wrong data type input
  9. Difference between string and char[] types in C++
  10. When to use bit-fields in C?
  11. How do I check if a C++ string is an int?
  12. long long in C/C++
  13. “X does not name a type” error in C++
  14. What exactly is a type cast in C/C++?
  15. In which order should floats be added to get the most precise result?
  16. C++ auto keyword. Why is it magic?
  17. How can I store objects of differing types in a C++ container?
  18. Issue when scheduling tasks using clock() function
  19. Casting a large number type to a smaller type
  20. Why is there an implicit type conversion from pointers to bool in C++?
  21. Difference between long and int data types [duplicate]
  22. What is the underlying type of a c++ enum?
  23. Decimal to hex conversion c++ built-in function
  24. What is the uintptr_t data type?
  25. Why does a C# System.Decimal remember trailing zeros?
  26. C++ class with template member variable
  27. C++ type of enclosing class in static member function
  28. Why do some people prefer “T const&” over “const T&”?
  29. Are there types bigger than long long int in C++?
  30. Show two digits after decimal point in c++ [duplicate]

Leave a Comment