Commodore Plus 4 - Built-in software; CHAPTER 4 Getting Started

30 The BASIC Language
40 READ C,D READs the next two values
50 PRINT "C =";C;"D =";D from the DATA list.
60 RESTORE Resets the data pointer to the
beginning of the DATA list.
70 READ X,Y,Z, READs the first three values
90 PRINT "X =";X;"Y = ";Y;"Z =";Z from the RESTOREd DATA
list.
RUN
A=1B=2
C = 3 D = 4
X= 1 Y=2 Z = 3
DEC Abbr. none
DEC (string)
Finds the decimal (base 10) value of a hexadecimal base 16) number. Hexa
decimal base digits are 0 through F, which equals decimal 15. The hexadecimal
number, which must be a string expression, must be between 0 and hexadecimal
value $FFFF, which is equal to decimal 65535. (The dollar sign preceding a
number is used to indicate that the number is hexadecimal but should NOT be
included in the string sent to the DEC function.) The DEC function returns the
unsigned value of the hexadecimal number. To get the 16-bit two's complement,
X, of a hexadecimal number, X$, use
X = DEC(X$)+(DEC(X$)>32767)*65536
Example: PRINT DEC("1E"); DEC("10"); DEC("A")
30 16 10
DEF FN Abbr. dE fn
DEF FN name (variable) = function
Defines a calculation as a function. DEF FN saves time and errors by sparing
you from having to reenter a calculation you will use more than once in a
program. After the function is defined as a formula, you can use it to solve a
specific problem. To do so, call the function and supply the value you want the
formula to solve, with FN name (value).
Parameters: function name (variable) = calculation
1. The function name is any legal variable name. When you want to use the
function later in the program, you give FN followed by the function name.
2. The (variable) is replaced by a value when you call the function you defined.