151 lines
5.6 KiB
HTML
151 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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table, th, td { border: 1px solid black; } th, td { padding: 10px; }
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body { background-color: #064066; color: #FFFFFF; }
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a { color: #40bfb8; }
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a::before {
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content: "---";
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font-family: monospace, monospace;
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display: inline-block;
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margin-right: 6px;
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color: #064066;
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}
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.rc_number { color: #0b9898; }
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.rc_string { color: #dd4040; }
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.rc_keyword { color: #6084a8; font-weight: bold; }
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.rc_comment { color: #6e716e; }
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#rc_code { font-family: Consolas,"courier new"; background-color: #2d3335; padding: 2px; font-size: 105%; }
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ul, #myUL {
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list-style-type: none;
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}
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#myUL {
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margin: 0;
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padding: 0;
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}
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.box {
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cursor: pointer;
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-webkit-user-select: none; /* Safari 3.1+ */
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-moz-user-select: none; /* Firefox 2+ */
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-ms-user-select: none; /* IE 10+ */
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user-select: none;
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}
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.box::before {
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content: "[+]";
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font-family: monospace, monospace;
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font-weight: bold;
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color: #40bfb8;
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display: inline-block;
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margin-right: 6px;
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}
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.box {
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font-weight: bold;
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color: #40bfb8;
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text-decoration: underline;
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}
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.check-box::before {
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content: "[-]";
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font-family: monospace, monospace;
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font-weight: bold;
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//color: dodgerblue;
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color: #40bfb8;
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}
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.nested {
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display: none;
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}
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.active {
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display: block;
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}
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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> |