Denso Power Net Terminal BHT-7500 Spécifications télécharger pdf (Page 78)

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Chapter 5. Data Types

5.1 Constants

5.1.1 Types of Constants

A constant is a data item whose value does not change during program execution. Constants

are classified into two types: string constants and numeric constants.

[ 1 ] String Constants

A "string constant" is a character string enclosed with a pair of double quotation marks ("). Its

length should be a maximum of 255 characters.

The character string should not contain a double quotation mark (") or any control codes.

[ 2 ] Numeric Constants

■ Integer Constants

– In decimal notation

An integer constant in decimals is usually followed by a percent sign (%) as shown

below, but the % can be omitted.

Syntax:

sign decimalnumericstring%

Where the sign is either a plus (+) or a minus (–). The plus sign can be omitted.

The valid range is from -32768 to 32767.

If included in an integer constant in decimals, a comma (,) for marking every three digits

will cause a syntax error.

– In hexadecimal notation

Integer constants in hexadecimals should be formatted as shown below.

Syntax:

&Hhexnumericstring

The valid range is from 0h to FFFFh.

If included in a numeric string in hexadecimals, a period denoting a decimal point will

cause a syntax error.

Constant Example

String constants

"ABC", "123"

Numeric constants Integer constants

Real constants

In decimal notation

In hexadecimal notation

123%, -4567

&HFFF, &h1A2B

123.45, -67.8E3

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 559 560

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