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Chapter 15. Function Reference

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MIDdle String function

MID$

Returns a portion of a given string expression from anywhere in the string.

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Syntax:

Syntax:Syntax:

Syntax:

MID$(stringexpression,startposition[,stringlength])

Parameter:

Parameter:Parameter:

Parameter:

startposition

A numeric expression which returns a value from 1 to 255.

stringlength

A numeric expression which returns a value from 0 to 255.

Description:

Description:Description:

Description:

Starting from a position specified by startposition, MID$ extracts a portion of a string

specified by stringexpression, by the number of characters specified by

stringlength.

• A returned value of MID$ depends upon the conditions as listed below.

Conditions Returned value

If stringlength

option is omitted:

All characters from startposition to the

end of the string

Example: PRINT MID$("ABC123",3)

C123

If stringlength is greater than the

number of characters contained

between startposition and the end

of the string:

All characters from startposition to the

end of the string

Example: PRINT MID$("ABC123",3,10)

C123

If startposition is greater than the

length of stringexpression:

Null string

Example: PRINT MID$("ABC123",10,1)

NOTE

BHT-BASIC does not support such MID$ function that replaces a part of a

string variable.

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