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doc/doc_files/loops.html
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doc/doc_files/loops.html
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<!DOCTYPE html>
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<html>
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<head>
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</style>
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<meta content="text/html; charset=UTF-8" http-equiv="content-type">
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<title>RCBasic Loops [RCBasic Doc] </title>
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</head>
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<body>
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<p><h1>LOOPS </h1></p>
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<p>
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RC BASIC has 3 types of loops: <b>FOR</b>, <b>WHILE</b>, and <b>DO</b>.
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</p>
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<p>
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The <b>FOR</b> loop repeats a block of code and increments a counter each time it finishes the block between <b>FOR</b> and <b>NEXT</b>. When the counter reaches a certain value the <b>FOR</b> loop stops.
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</p>
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<p id="rc_code"><code>
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<span class="rc_keyword">For</span> I = <span class="rc_number">1</span> <span class="rc_keyword">To</span> <span class="rc_number">5</span> <br>
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<span class="rc_keyword">Print</span> I <br>
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<span class="rc_keyword">Next</span> <br>
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</code></p>
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<p>
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The above code will output the numbers 1 to 5 to the console. Optionally you could use the <b>STEP</b> keyword to set the number that the counter will increase by. Look at the following:
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</p>
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<p id="rc_code"><code>
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<span class="rc_keyword">For</span> I = <span class="rc_number">1</span> <span class="rc_keyword">To</span> <span class="rc_number">5</span> Step <span class="rc_number">2</span> <br>
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<span class="rc_keyword">Print</span> I <br>
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<span class="rc_keyword">Next</span> <br>
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</code></p>
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<p>
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The above code will output the numbers 1, 3, and 5 to the console. The <b>STEP</b> keyword increases I by 2 each time through the <b>FOR</b> loop.
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</p>
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<p>
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<b>WHILE</b> loops will execute a block of code while a certain condition is true.
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</p>
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<p id="rc_code"><code>
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I = <span class="rc_number">0</span> <br>
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<span class="rc_keyword">While</span> I < <span class="rc_number">5</span> <br>
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<span class="rc_keyword">Print</span> I <br>
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I = I + <span class="rc_number">1</span> <br>
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<span class="rc_keyword">Wend</span> <br>
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</code></p>
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<p>
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The above code will output the numbers 0 to 4. It will not output the number 5 because if ( I < 5 ) is false the loop will not repeat.
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</p>
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<p>
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The <b>DO</b> loop is similar to the <b>WHILE</b> loop with an exception. The <b>WHILE</b> loop checks for the loop condition at the start of the loop but the <b>DO</b> loop checks for the loop condition at the end of the loop. What this means is that a <b>WHILE</b> loop will never execute if the condition is false at the start but the <b>DO</b> loop is guaranteed to execute at least once before it checks if the condition was true or not.
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</p>
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<p>
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The <b>DO</b> loop is also unique in that it has 3 different forms. Here is the simplest form of the <b>DO</b> loop.
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</p>
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<p id="rc_code"><code>
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<span class="rc_keyword">Do</span> <br>
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<span class="rc_keyword">Print</span> <span class="rc_string">"HELLO WORLD"</span> <br>
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<span class="rc_keyword">Loop</span> <br>
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</code></p>
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<p>
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The code above will continue to output HELLO WORLD to the console infinitely.
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</p>
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<p id="rc_code"><code>
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I = <span class="rc_number">0</span> <br>
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<span class="rc_keyword">Do</span> <br>
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<span class="rc_keyword">Print</span> I <br>
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I = I + <span class="rc_number">1</span> <br>
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<span class="rc_keyword">Loop</span> <span class="rc_keyword">While</span> I < <span class="rc_number">5</span> <br>
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</code></p>
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<p>
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The above code will output the numbers 0 to 4 to the console. This form of the <b>DO</b> loop will continue to loop while the loop condition is true.
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</p>
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<p id="rc_code"><code>
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I = <span class="rc_number">0</span> <br>
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<span class="rc_keyword">Do</span> <br>
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<span class="rc_keyword">Print</span> I <br>
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I = I + <span class="rc_number">1</span> <br>
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<span class="rc_keyword">Loop</span> <span class="rc_keyword">Until</span> I = <span class="rc_number">5</span> <br>
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</code></p>
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<p>
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The above code will output the numbers 0 to 4 to the console. This form of the <b>DO</b> loop will continue to loop until the loop condition is true.
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</p>
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<p>
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</body>
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</html>
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