title: symbol has no Implicit type
body: <p>I'm running this code via fortran 90</p>
  
  <pre><code>   Program Projectile
  ! This Program Calculates the Velocity and Height of a
  ! Projectile
  ! Given its Initial Height, Initial Velocity and Constant
  ! Acceleration.
  Implicit None
  Real :: Initial_Hight, Height, Initial_Velocity, Velocity, &amp;
  Time, Acceleration = -9.807
  ! Obtain Values for Initial Height, Initial Velocity and
  ! Time
  Print*, "Enter the Initial Height and Velocity:"
  Read*, Initial_Height, Initial_Velocity
  Print*, "Enter Time at Which to Calculate Height and &amp;
  Velocity:"
  Read*, Time
  ! Calculate the Height and Velocity
  Height = 0.5 * Acceleration * Time ** 2 + Initial_Velocity &amp;
  * Time + Initial_Height
  Velocity = Acceleration * Time + Initial_Velocity
  ! Display Velocity and Height
  Print*, "At Time", Time, "The Vertical Velocity is", Velocity
  Print*, "and the Height is", Height
  End Program Projectile
  </code></pre>
  
  <p>But I constantly get this Error : Error Symbol 'initial_height' has no IMPLICIT type and after erasing implicit none line I can't use real number because real number cause another error, can you help me out?</p>