Project is one file; all documentation is in front comment block.

Fetching it.
 $ cp cp /home/jwelch/html/midterm_project/derivative.f .

There aren't any compilation instructions included.
From what I know of fortran and what's on cs :
 $ make derivativef
 f77    derivativef.f   -o derivativef
 $ f77 --version
 GNU Fortran (GCC) 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
 $ ./derivative

Solidity : not particularly; it's easy to confuse it.
>  $ ./derivativef
   Would you like to:
  (a) Take a derivative?
  (b) Solve a diff. equation with Eulers technique?
> zzz
  What is the function you wish to solve?
  In the form of constant, x power, y power
> adfjka; afjka;;lka
 invalid number: incomprehensible list input
 apparent state: unit 5 (unnamed)
 last format: list io
 lately reading direct formatted external IO
 Aborted

--- Does it work? Yes. ---
./deriviate
 Would you like to:
 (a) Take a derivative?
 (b) Solve a diff. equation with Eulers technique?
b
 What is the function you wish to solve?
 In the form of constant, x power, y power
3, 2, 5
 What are the initial x and y values, ie y[?]=?
 In the form of xvalue yvalue
0 1
 What length increment do you want to use?
.02
 What is the number of iterations you wishto calculate?
30
 X( 1) =  0.0199999996
 Y( 1) =  1.
 X( 2) =  0.0399999991
 Y( 2) =  1.00002396
 X( 3) =  0.0599999987
 Y( 3) =  1.00011992
 X( 4) =  0.0799999982
 Y( 4) =  1.00033605
 X( 5) =  0.099999994
 Y( 5) =  1.00072074
 X( 6) =  0.11999999
 Y( 6) =  1.00132287
 X( 7) =  0.139999986
 Y( 7) =  1.00219262
 X( 8) =  0.159999982
 Y( 8) =  1.00338161
 X( 9) =  0.179999977
 Y( 9) =  1.00494373
 X( 10) =  0.199999973
 Y( 10) =  1.00693631
 X( 11) =  0.219999969
 Y( 11) =  1.00942075
 X( 12) =  0.239999965
 Y( 12) =  1.01246417
 X( 13) =  0.259999961
 Y( 13) =  1.01614094
 X( 14) =  0.279999971
 Y( 14) =  1.02053499
 X( 15) =  0.299999982
 Y( 15) =  1.02574217
 X( 16) =  0.319999993
 Y( 16) =  1.03187394
 X( 17) =  0.340000004
 Y( 17) =  1.03906155
 X( 18) =  0.360000014
 Y( 18) =  1.04746222
 X( 19) =  0.380000025
 Y( 19) =  1.05726719
 X( 20) =  0.400000036
 Y( 20) =  1.06871283
 X( 21) =  0.420000046
 Y( 21) =  1.08209658
 X( 22) =  0.440000057
 Y( 22) =  1.09779954
 X( 23) =  0.460000068
 Y( 23) =  1.11632085
 X( 24) =  0.480000079
 Y( 24) =  1.13833046
 X( 25) =  0.50000006
 Y( 25) =  1.16475308
 X( 26) =  0.520000041
 Y( 26) =  1.19690895
 X( 27) =  0.540000021
 Y( 27) =  1.23676217
 X( 28) =  0.560000002
 Y( 28) =  1.28738773
 X( 29) =  0.579999983
 Y( 29) =  1.35392642
 X( 30) =  0.599999964
 Y( 30) =  1.44575596
 X( 31) =  0.619999945
 Y( 31) =  1.58219182
 X( 32) =  0.639999926
 Y( 32) =  1.81087291
 X( 33) =  0.659999907
 Y( 33) =  2.28944898
 X( 34) =  0.679999888
 Y( 34) =  3.93341899
 X( 35) =  0.699999869
 Y( 35) =  30.0562305
 X( 36) =  0.71999985
 Y( 36) =  721170.375
 X( 37) =  0.739999831
 Y( 37) =  6.06743931E+27
 X( 38) =  0.759999812
 Y( 38) =  INF
 X( 39) =  0.779999793
 Y( 39) =  INF
 X( 40) =  0.799999774
 Y( 40) =  INF
 X( 41) =  0.819999754
 Y( 41) =  INF
 X( 42) =  0.839999735
 Y( 42) =  INF
 X( 43) =  0.859999716
 Y( 43) =  INF
 X( 44) =  0.879999697
 Y( 44) =  INF
 X( 45) =  0.899999678
 Y( 45) =  INF
 X( 46) =  0.919999659
 Y( 46) =  INF
 X( 47) =  0.93999964
 Y( 47) =  INF
 X( 48) =  0.959999621
 Y( 48) =  INF
 X( 49) =  0.979999602
 Y( 49) =  INF
 X( 50) =  0.999999583
 Y( 50) =  INF