By Walter S. Brainerd
A primary useful consultant to Fortran ninety by way of participants of the X3J3 Committee. it is a educational 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 advisor to programming languages are simple rules, basic programming routines, a number of examples and difficulties. Written via 4 senior participants of the ANSI Fortran criteria Committee X3J3, this e-book serves as a brief resource of data for training pros.
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Additional info for A Programmer's Guide to Fortran 90
When an array has been defined but not allocated the status is said to be unallocated or not currently allocated. When an array appears in an ALLOCATE statement then the array is said to be allocated, and once the array has been deallocated it is said to be not currently allocated. The DEALLOCATE statement can only be used on arrays which are currently allocated, and similarly, the ALLOCATE statement can only be used on arrays which are not currently allocated. Thus, ALLOCATE can only be used on a previously allocated array if it has been deallocated first.
The following examples show various array sections of an array using subscript triplets. The elements marked with x denote the array section. Let the defined array from which the array section is extracted be a 5x5 array. 3 Vector Subscripts A vector subscript is an integer expression of rank 1. Each element of this expression must be defined with values that lie within the parent array subscript bounds. The elements of a vector subscript may be in any order. An example of an integer expression of rank 1 is: (/3,2,12,2,1/) An example showing the use of a vector subscript iv is: REAL, DIMENSION :: ra(6), rb(3) INTEGER, DIMENSION (3) :: iv iv = (/ 1, 3, 5 /) !
7 Exercises 1. Write a program that calls a function to sum all of the integers between min and max. Set min and max to be optional keyword arguments which default to 1 and 10 respectively. f90) 2. f90. Compile and run. What is wrong? Rewrite it in a better way in Fortran 90. f90) 3. Write a recursive function to calculate the nth value of the Fibonacci sequence. e. 1, 1, 2, 3, 5, 8, 13, ... f90) 4. Write a program which defines a generic function to return the maximum absolute value of two variables, for real, integer and complex variable types.
A Programmer's Guide to Fortran 90 by Walter S. Brainerd