By Walter S. Brainerd
A primary functional advisor to Fortran ninety via participants of the X3J3 Committee. it is a instructional on Fortran ninety for programmers and engineers and scientists who paintings with Fortran seventy seven and want to profit the seriously revised criteria supplied for in Fortran ninety. lined during this consultant to programming languages are easy rules, basic programming workouts, a number of examples and difficulties. Written by way of 4 senior participants of the ANSI Fortran criteria Committee X3J3, this publication serves as a short resource of knowledge for working towards execs.
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Additional info for A Programmer's Guide to Fortran 90
MODULE PROCEDURE list END INTERFACE where list is a list of the names of the module procedures concerned. 2 Defining Operators It is possible to define new operators. and this is particularly useful when using defined types. ’ at the beginning and end of the operator name. plus. could have been defined instead of using ‘+’. The operation needs to be defined via a function, which has one or two non-optional arguments with INTENT(IN). dist. which calculates the straight line distance between two derived type ‘points’.
END SUBROUTINE sub END PROGRAM array Notice that using an allocatable array a, the array is exactly the size we require in the main program and so we can pass this easily to the subroutine. The work array, work, is an automatic array whose bounds depend on the dummy argument n1. 13 Assumed Shape Arrays An assumed shape array is an array whose shape is not known, but which takes on whatever shape is imposed by the actual argument. When declaring an assumed shape array, each dimension is specified as: [lower_bound]: 54 Fortran 90 Student Notes Array Processing where the lower bound defaults to 1 if omitted.
The ALLOCATE specifies the bounds of the array and, as with any array allocation, the lower bound defaults to one if only the upper bound is specified. For example, the array declared above could be allocated with lower bound zero: ALLOCATE (a(0:n,m)) The bounds may also be integer expressions, for example: ALLOCATE (a(0:n+1,m)) The space allocated to the array with the ALLOCATE statement can later be released with the DEALLOCATE statement. The DEALLOCATE statement requires only the name of the array concerned and not the shape.