Intrinsic Procedures

Fortran 90 has 113 in-built or intrinsic procedures to perform common tasks efficiently, they belong to a number of classes:

• elemental such as:
  • mathematical, for example, SIN or LOG.
  • numeric, for example, SUM or CEILING;
  • character, for example, INDEX and TRIM;
  • bit, for example, IAND and IOR;
• inquiry, for example, ALLOCATED and SIZE;
• transformational, for example, REAL and TRANSPOSE;
• miscellaneous (non-elemental SUBROUTINE s), for example, SYSTEM_CLOCK and DATE_AND_TIME.

Note all intrinsics which take REAL valued arguments also accept DOUBLE PRECISION arguments.

For more information, click here