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  1. PROGRAM Radioactive_Decay
  2. ! written by Ryan Hancock in 2012
  3. !----------------------------------------------------------------------------
  4. ! This program calculates the amount of a radioactive substance that 
  5. ! remains after a specified time, given an initial amount and its 
  6. ! half-life.  Variables used are:
  7. !   InitalAmount    : initial amount of substance (mg)
  8. !   HalfLife        : half-life of substance (days)
  9. !   Time            : time at which the amount remaining is calculated (days)
  10. !   AmountRemaining : amount of substance remaining (mg)
  11. !
  12. ! Input:   InitialAmount, HalfLife, Time
  13. ! Output:  AmountRemaining
  14. !-----------------------------------------------------------------------------
  15.  
  16.   IMPLICIT NONE
  17.   REAL :: InitialAmount, HalfLife, Time, AmountRemaining
  18.  
  19.   ! Get values for InitialAmount, HalfLife, and Time.
  20.  
  21.   WRITE(*,*) "Enter initial amount (mg) of substance, its half-life (days)"
  22.   WRITE(*,*) "and time (days) at which to find amount remaining:"
  23.   READ *, InitialAmount, HalfLife, Time
  24.  
  25.   ! Compute the amount remaining at the specified time.
  26.   AmountRemaining = InitialAmount * 0.5 ** (Time / HalfLife)
  27.  
  28.   ! Display AmountRemaining.
  29.   WRITE(*,*) "Amount remaining =", AmountRemaining, "mg"
  30.  
  31. END PROGRAM Radioactive_Decay
  32.  
Success #stdin #stdout 0.01s 2620KB
comments (?)
stdin 
10
140
140
stdout 
 Enter initial amount (mg) of substance, its half-life (days)
 and time (days) at which to find amount remaining:
 Amount remaining =   5.0000000     mg
https://ideone.com/tm3u8
language:
Fortran (gfortran 8.3)
created:
14 years ago
visibility:
public

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