Commodore Plus 4 - Numbers and basic operators

54 The BASIC Language
Examples: 10 A$ = "THE LAST STRAW"
20 PRINT INSTR(A$, "ST")
RUN
7
PRINT INSTR(A$, "ST",8)
10
INT
INT (number)
The sought string is found starting at
character position 7.
Using 7 + 1 as the starting location,
another instance of the sought string is
found at character position 10.
Abbr. none
Truncates a number with decimal parts into a whole integer number. The INT
function simply ignores the decimal parts of the number; INT does not round the
number. This means that the result is always less than or equal to the original
number. For example, INT(9.9) is 9, not 10.
When the number is negative, the result is also always less than or equal to the
number. In the case of negative numbers with a decimal value greater than .0, INT
returns the next lowest integer. For example, INT(-5.1) is -6.
The INT function is often used with the RND (random number) function to
generate random whole numbers. See the RND function.
Parameter: number in parentheses
The number can be any number, positive or negative. You can also use a
calculation or variable as the number.
Note: To round off a number, X, use INT (X+.5)
Examples: PRINT INT(-5.0)
-5
PRINT INT(2.2*3)
6
JOY
JOY
(port number)
Abbr.jO
Finds the status of either joystick. Use JOY(l) to examine the status of the
joystick in joy port 1; use JOY(2) to examine the status of the joystick in joy port
2.
The JOY function reads nine different joystick positions, which are numbered
0 through 8. Nine additional readings, numbered 128 through 136, are displayed
when the fire button is also being pressed. The readings are shown in Table 1-5.