Fortran code to specify floating-point numbers.

double_precision_real.f95

!****************************************************
! 単精度・倍精度浮動小数点数の確認
!
! date          name            version
! 2017.04.10    mk-mode.com     1.00 新規作成
!
! Copyright(C) 2017 mk-mode.com All Rights Reserved.
!****************************************************
!
program double_precision_real
  implicit none
  integer, parameter ::  SP = kind(1.0)
  integer, parameter ::  DP = selected_real_kind(2*precision(1.0_SP))
  real(SP) :: a
  real(DP) :: b
  a = 3.1415926535897323846264338327950288_SP
  b = 3.1415926535897323846264338327950288_DP
  print *,' a, b = ', a, b
end program double_precision_real