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9.189 MOD — Remainder function

Description:
MOD(A,P) computes the remainder of the division of A by P.
Standard:
Fortran 77 and later
Class:
Elemental function
Syntax:
RESULT = MOD(A, P)
Arguments:

A Shall be a scalar of type INTEGER or REAL.
P Shall be a scalar of the same type and kind as A and not equal to zero.

Return value:
The return value is the result of A - (INT(A/P) * P). The type and kind of the return value is the same as that of the arguments. The returned value has the same sign as A and a magnitude less than the magnitude of P.
Example:
          program test_mod
            print *, mod(17,3)
            print *, mod(17.5,5.5)
            print *, mod(17.5d0,5.5)
            print *, mod(17.5,5.5d0)
          
            print *, mod(-17,3)
            print *, mod(-17.5,5.5)
            print *, mod(-17.5d0,5.5)
            print *, mod(-17.5,5.5d0)
          
            print *, mod(17,-3)
            print *, mod(17.5,-5.5)
            print *, mod(17.5d0,-5.5)
            print *, mod(17.5,-5.5d0)
          end program test_mod

Specific names:

Name Arguments Return type Standard
MOD(A,P) INTEGER A,P INTEGER Fortran 95 and later
AMOD(A,P) REAL(4) A,P REAL(4) Fortran 95 and later
DMOD(A,P) REAL(8) A,P REAL(8) Fortran 95 and later

See also:
MODULO