Programming Manual for Citizen BASIC Interpreter - MaRCo
Programming Manual for Citizen BASIC Interpreter - MaRCo
Programming Manual for Citizen BASIC Interpreter - MaRCo
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<strong>Citizen</strong> <strong>BASIC</strong> <strong>Interpreter</strong><br />
Done=1<br />
ELSE<br />
Done=0<br />
ENDIF<br />
2.3.6 Control Loop<br />
Use of a loop repeatedly executes a series of statements to stop execution using<br />
control conditions or control variables. <strong>BASIC</strong> includes four types of control<br />
loops: REPEAT statement, WHILE statement, DO statement and FOR statement.<br />
Use of the EXIT procedure controls the flow of the REPEAT statement, WHILE statement,<br />
DO statement or FOR statement. EXIT ends execution of a statement including them.<br />
2.3.7 REPEAT Statement<br />
The following shows the syntax of the REPEAT statement:<br />
REPEAT<br />
{statement}<br />
UNTIL <strong>for</strong>mula<br />
The <strong>for</strong>mula returns a logic value. The REPEAT statement executes a series of<br />
statements constructing it to test the <strong>for</strong>mula every time repetition ends. When<br />
the <strong>for</strong>mula returns true, the REPEAT statement ends. Since the <strong>for</strong>mula is not<br />
assessed until the first execution is completed, a series of statements will always<br />
be executed at least once.<br />
An example of the REPEAT statement includes:<br />
REPEAT<br />
K=I MOD J<br />
I=J<br />
J=K<br />
UNTILJ=0<br />
REPEAT<br />
PRINT"Enter a value(0..9):";<br />
INPUT I<br />
UNTIL(I>=0)AND(I
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