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E-67
Example Lbl 1 : ?
→
A : A
>
0
S
'
(A)
^
Goto 1
=,
≠
, >,
>
, <,
<
(Relational Operators)
Syntax {expression} {relational operator} {expression}
Function These commands evaluate the expressions on either side, and return a value
of true (1) or false (0). These commands are used in combination with the
branching command
S
, and when structuring the {conditional expression} of
If statements and While statements.
Example See the entries for
S
(page 66), If statement (page 67), and While statement
(page 68).
Note
These commands evaluate the expressions on either side, and return 1 if true and 0 if false,
and store the result in Ans.
A
Control Structure Commands/If Statement
g
The If statement is used to control program execution branching according to whether the
expression following If (which is the branching condition) is true or false.
If Statement Precautions
• An If must always be accompanied by a Then. Using an If without a corresponding Then
will result in a Syntax ERROR.
• An expression, Goto command, or Break command can be used for the {expression*}
following Then and Else.
If~Then (~Else) ~IfEnd
Syntax If {conditional expression} : Then {expression*} : Else {expression*} : IfEnd :
{statement} : ...
Function • The statements following Then are executed up to Else, and then the
statements following IfEnd are executed when the conditional statement
following If is true. The statements following Else and then the statements
following IfEnd are executed when the conditional statement following If is
false.
• Else {expression} may be omitted.
• Always include the IfEnd:{statement}. Omitting it will not cause an error,
but certain program contents can cause unexpected execution results by
everything after the If statement.
Example 1 ?
→
A : If A < 10 : Then 10A
^
Else 9A
^
IfEnd : Ans×1.05
Example 2 ?
→
A : If A > 0 : Then A × 10
→
A : IfEnd : Ans×1.05
A
Control Structure Commands/For Statement
g
The For statement repeats execution of the statements between For and Next as long as
the value assigned to the control variable is within the specifi ed range.
For Statement Precautions
A For statement must always be accompanied by a Next statement. Using a For without a
corresponding Next will result in a Syntax ERROR.