TAL Programmer's Guide

Equivalencing Simple Variables

Using Equivalenced Variables

096254 Tandem Computers Incorporated 10–5

Accessing Equivalenced

Simple Variables

Once you have declared an equivalenced variable, you access it in the same way as

you access any other variable, by specifying its identifier in a statement.

Accessing Words in Doublewords

You can declare two INT variables, each equivalent to one of the two words of an

INT(32) variable. You can then access the location either as an INT variable or as an

INT(32) variable:

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INT(32) dbl;

INT a = dbl;

INT b = a[1];

a := 0; !Access first word of DBL

dbl := -1D; !Access DBL as a doubleword

DBL

Accessing Bytes in Words

You can equivalence a STRING variable to an INT array, and then access bytes in the

INT array by indexing the STRING variable:

INT word[0:2];

STRING s = word;

s[3] := 0;

IF s[4] > 2 THEN ...;

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WORD[0]

WORD[1]

WORD[2]

S[0] S[1]

S[2] S[3]

S[4] S[5]