Metrologic IS1000 Series Betriebsanweisung PDF herunterladen (Seite 39)

Chapter

BASIC

Commands

If there is no difference between the corresponding characters of two strings and they are

the same length, then the two strings are equal. If there is no difference between the

corresponding characters of two strings, but one of the strings is longer, the longer string is

greater than the shorter string. For example, "abc" = "abc" and "aaaaaaaa" > "aaaaa" are

both true expressions.

Leading and trailing blank spaces are significant in comparing strings. For example, the

string " abc" is less than the string "abc" since a blank space is less than an "a"; on the other

hand, the string "abc " is greater than the string "abc".

5.4.3 Getting the Length of a String

LEN

Purpose

To return the length of a string.

Syntax

A% = LEN(X$)

Remarks

"A%" is an integer variable to be assigned to the result.

"X$" may be a string variable, string expression, or string constant.

Note that non-printing characters and blanks are counted.

Example

String1$ = "abcde "

A% = LEN(String1$)

'A% = 6, including the blank

5.4.4 Searching for Strings

Searching for a string inside another one is one of the most common string-processing tasks.

INSTR is provided for this task.

INSTR

Purpose

To search if one string exists inside another one.

Syntax

A% = INSTR([N%,] X$, Y$)

Remarks

"A%" is an integer variable to be assigned to the result.

"N%" is a numeric expression in the range of 1 to 255. Optional offset N sets the

position for starting the search.

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Metrologic IS1000 Series Betriebsanweisung Seite 39