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3.4 Programming with dynamic arrays

The utility READRE returns an address, IATAB, such that M(IATAB) is the first element in the dynamic array. There exist a priori two solutions to utilize this array:

1. Pass M(IATAB) as a parameter to a subroutine inside which the array is used in the classical way (see MODUL1 in section 3.1).
2. Use this array directly by calculating the indices in the super-array (see MODUL2 in section 3.1 and "double precision real problems" in section 3.5).

The first solution is recommended even though it necessitates a call to a sub-program, because:

• it avoids address computations and thus facilitates the writing of the sub-program, especially in double precision;
• the sub-program is more readable and independent of dynamic addressing;
• if the effective length of the arrays appears in the declaration of the parameters (instead of *), the system can detect possible overflows at execution time.