Example Lbl 1 : ? → A : A > 0 S '(A) ^ Goto 1A Control Structure Commands: If Statements

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 statement must always be accompanied by a Then statement. Using an If without a corresponding Then will result in a Syntax ERROR.

•An expression, Return, or Stop 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”. 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 Statements

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.

For ~ To ~ Next(COMP)

 

 

Syntax

For <expression (start value)> → <variable (control variable)> To <expression

 

(end value)> : <statement> : ... <statement> : Next : ...

 

Function

Execution of the statements from For to Next repeats as the control variable

 

is incremented by 1 with each execution, starting from the starting value.

 

When the value of the control value reaches the ending value, execution

 

jumps to the statement following Next. Program execution stops if there is no

 

statement following Next.

 

Example

For 1 → A To 10 : A2 → B : B ^ Next

 

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