Install libqd0v5 by entering the following commands in the terminal:
sudo apt update sudo apt install libqd0v5
Double-double and quad double types in C++ and F90
This package supports both a double-double datatype (approx. 32 decimal digits) and a quad-double datatype (approx. 64 decimal digits). The computational library is written in C++. Both C++ and Fortran-90 high-level language interfaces are provided to permit one to convert an existing C++ or Fortran-90 program to use the library with only minor changes to the source code.