Commodore 128D - Page 283

p
LET
This tells the computer to select the (VIC) text screen and list the
program whenever the F7 key is pressed (in direct mode). CHR$(13)
is the ASCII character for RETURN and performs the same action as
pressing the RETURN key. Use CHR$(27) for ESCape. Use CHR$(34)
to incorporate the double quote character into a KEY string. The
keys may be redefined in a program. For example:
10 KEY 2,"PRINT DS$" + CHR$(13)
Thfs tells the computer to check and display the disk drive error
channel variables (PRINT DS$) each time the F2 function key is
pressed.
10 FOR 1 = 1 to 8:KEY I, CHR$(I +132):NEXT
This defines the function keys as CHR$ 133 through CHR$ 140.
To restore all function keys to their BASIC default values, reset the
Commodore 128 by pressing the RESET button.
—Assigns a value to a variable
[LET] variable = expression
The word LET is rarely used in programs, since it is not necessary.
Whenever a variable is defined or given a value, LET is always
implied. The variable name that receives the result of a calculation is
on the left side of the equal sign. The number, string or formula is on
the right side. You can only assign one value with each (implied) LET
statement. For example, LET A = B = 2 does not equate A and B to
2.
EXAMPLE:
10 LET A = 5 Assign the value 5 to numeric variable A.
20 B = 6 Assign the value 6 to numeric variable B.
30C = A*B + 3 Assign the numeric variable C, -the value
resulting from 5 times 6 plus 3.,
40 D$ = "HELLO" Assign the string "HELLO" to string variable
D$.
275
BASIC 7.0 ENCYCLOPEDIA—Basic Commands and Statements