A-M baby

Task/Forward-difference/Fortran/forward-difference-1.f

@@ -0,0 +1,20 @@
+MODULE DIFFERENCE
+  IMPLICIT NONE
+
+  CONTAINS
+
+  SUBROUTINE Fdiff(a, n)
+    INTEGER, INTENT(IN) :: a(:), n
+    INTEGER :: b(SIZE(a))
+    INTEGER :: i, j, arraysize
+
+    b = a
+    arraysize = SIZE(b)
+    DO i = arraysize-1, arraysize-n, -1
+      DO j = 1, i
+        b(j) = b(j+1) - b(j)
+      END DO
+    END DO
+    WRITE (*,*) b(1:arraysize-n)
+  END SUBROUTINE Fdiff
+END MODULE DIFFERENCE

Task/Forward-difference/Fortran/forward-difference-2.f

@@ -0,0 +1,13 @@
+PROGRAM TEST
+
+  USE DIFFERENCE
+  IMPLICIT NONE
+
+  INTEGER :: array(10) = (/ 90, 47, 58, 29, 22, 32, 55, 5, 55, 73 /)
+  INTEGER :: i
+
+  DO i = 1, 9
+    CALL Fdiff(array, i)
+  END DO
+
+  END PROGRAM TEST