Apple IIe - Page 41

Applesoft BASIC Programming 41
Illustration 3-1. Program Mode Entry & Execution
Line Numbers
] NEW
]
10 PRINT "JIM SMITH"
] 20 PRINT "1220 EUCLID AVE"
]
30 PRINT "CLEVELAND, OH 44122"
]
40 END
]RUN
JIM SMITH
1220 EUCLID AVE
CLEVELAND, OH 44122
l
In the program mode, program lines must begin with a line
number. A line number is a one through five digit number
entered at the beginning of a program line. The line number at
the beginning of a program line is the only difference between it
and an immediate mode line.
No two line numbers can be the same. If the same line number is
used more than once in a program, the line most recently
entered
will replace the original.
The execution sequence
of a BASIC program is determined by
the value of its line number. The lowest line numbers will be
executed first,
followed by program lines with higher line
numbers. Even if program lines are not arranged in sequential
order, the Applesoft BASIC interpreter will place the lines in the
correct order.