TAL Programmer's Guide

Arithmetic Expressions
Using Expressions
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Signed Arithmetic
Operators
Signed arithmetic operators and the operand types on which they can operate are
shown in Table 5-10.
Table 5-10. Signed Arithmetic Operators
Operator Operation Operand Type
*
Example
+ Unary plus Any data type +5
– Unary minus Any data type –5
+ Binary signed addition Any data type alpha + beta
– Binary signed subtraction Any data type alpha – beta
* Binary signed multiplication Any data type alpha * beta
/ Binary signed division Any data type alpha / beta
*
The data type of the operands must match except as noted in “Data Types of Expressions”
earlier in this section.
Table 5-11 shows the combinations of operand types you can use with a binary signed
arithmetic operator and the result type yielded by such operators. In each
combination, the order of the data types is interchangeable.
Table 5-11. Signed Arithmetic Operand and Result Types
Operand Type Operand Type Result Type Example
STRING STRING INT byte1 + byte2
INT INT INT word1 – word2
INT(32) INT(32) INT(32) dbl1
*
dbl2
REAL REAL REAL real1 + real2
REAL(64) REAL(64) REAL(64) quad1 + quad2
FIXED FIXED FIXED fixed1
*
fixed2
INT STRING INT word1 / byte1
INT UNSIGNED(1–16) INT word + unsign12
INT(32) UNSIGNED(17–31) INT(32) double + unsign20
UNSIGNED(1–16) UNSIGNED(1–16) INT unsign6 + unsign9
UNSIGNED(17–31) UNSIGNED(17–31) INT(32) unsign26 + unsign31
The compiler treats a STRING or UNSIGNED(1–16) operand as an INT operand. If
bit <0> contains a 0, the operand is positive; if bit <0> contains a 1, the operand is
negative.
The compiler treats an UNSIGNED(17–31) operand as a positive INT(32) operand.