Tandy 1000 Basic Reference Manual

Chapter 10 I BASIC Keywords
INSTR
Function
Searches for the first occurrence of string2 in stringl and re-
turns the position
at which the match is found.
Number specifies the position in stringl to begin searching for
string2. Number must be an integer in the range 1 to 255. If you
omit
number, INSTR starts searching at the first character in
stringl .
If BASIC finds string2 in stringl, it returns the starting position
of the match; otherwise, it returns zero.
If the entire substring
is not contained in the search string, BASIC returns a zero.
Examples
Suppose A$ = “LINCOLN”
Statement BASIC returns
INSTR(A$, “INC”)
2
INSTR(A$, “12”) 0
INSTR(A$, “LINCOLNABRAHAM”) 0
For a slightly different use of INSTR, try:
10 X=INSTR (3, “1232123”, “12”)
20 PRINT X
which prints 5, because the search started at the third
character.
185

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200