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×1.05Example 2 ? → A : If A > 0 : Then A × 10 → A : IfEnd : Ans×1.05A 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 specified 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.

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