QUAD_OPEN_MP:
  C++/OpenMP version
  Estimate the integral of f(x) from A to B.
  f(x) = 50 / ( pi * ( 2500 * x * x + 1 ) ).

  A        = 0
  B        = 10
  N        = 10000000
  Exact    =       0.4993633810764567

  Estimate =       0.4993712889191264
  Error    = 7.907842669685472e-06
  W time   = 0.4575988622382283

QUAD_OPEN_MP:
  C++/OpenMP version
  Estimate the integral of f(x) from A to B.
  f(x) = 50 / ( pi * ( 2500 * x * x + 1 ) ).

  A        = 0
  B        = 10
  N        = 10000000
  Exact    =       0.4993633810764567

  Estimate =       0.4993712889191463
  Error    = 7.907842689558464e-06
  W time   = 0.2379896184429526

QUAD_OPEN_MP:
  C++/OpenMP version
  Estimate the integral of f(x) from A to B.
  f(x) = 50 / ( pi * ( 2500 * x * x + 1 ) ).

  A        = 0
  B        = 10
  N        = 10000000
  Exact    =       0.4993633810764567

  Estimate =       0.4993712889191516
  Error    = 7.907842694832024e-06
  W time   = 0.1488232621923089

QUAD_OPEN_MP:
  C++/OpenMP version
  Estimate the integral of f(x) from A to B.
  f(x) = 50 / ( pi * ( 2500 * x * x + 1 ) ).

  A        = 0
  B        = 10
  N        = 10000000
  Exact    =       0.4993633810764567

  Estimate =       0.4993712889191149
  Error    = 7.907842658139153e-06
  W time   = 0.07545179035514593