Mod Intrinsic
.............
Mod(A, P)
Mod: `INTEGER' or `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.
A: `INTEGER' or `REAL'; scalar; INTENT(IN).
P: `INTEGER' or `REAL'; scalar; INTENT(IN).
Intrinsic groups: (standard FORTRAN 77).
Description:
Returns remainder calculated as:
A - (INT(A / P) * P)
P must not be zero.