Fortran 95 Language Features - Intrinsic Procedures

Intrinsic Procedures

Most of the intrinsic functions have already been mentioned. Here, we deal only with their general classification and with those that have so far been omitted. All intrinsic procedures can be used with keyword arguments:

CALL DATE_AND_TIME (TIME=t)

and many have optional arguments.

The intrinsic procedures are grouped into four categories:

  1. elemental - work on scalars or arrays, e.g. ABS(a);
  2. inquiry - independent of value of argument (which may be undefined), e.g. PRECISION(a);
  3. transformational - array argument with array result of different shape, e.g. RESHAPE(a, b);
  4. subroutines, e.g. SYSTEM_CLOCK.

The procedures not already introduced are::

Bit inquiry BIT_SIZE Number of bits in the model Bit manipulation BTEST Bit testing IAND Logical AND IBCLR Clear bit IBITS Bit extraction IBSET Set bit IEOR Exclusive OR IOR Inclusive OR ISHFT Logical shift ISHFTC Circular shift NOT Logical complement Transfer function, as in INTEGER :: i = TRANSFER('abcd', 0) (replaces part of EQUIVALENCE) Subroutines DATE_AND_TIME Obtain date and/or time MVBITS Copies bits RANDOM_NUMBER Returns pseudorandom numbers RANDOM_SEED Access to seed SYSTEM_CLOCK Access to system clock CPU_TIME Returns processor time in seconds

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