98 lines
2.9 KiB
HTML
98 lines
2.9 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 Scope [RCBasic Doc] </title>
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</head>
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<body>
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<p><h1>SCOPE </h1></p>
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<p>
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Scope refers to where you are able to access a variable. Basically variables cannot be accessed from outside the scope they are created in. Look at the following:
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</p>
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<p id="rc_code"><code>
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A = <span class="rc_number">5</span> <br>
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<br>
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<span class="rc_keyword">While</span> A < <span class="rc_number">10</span> <br>
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B = <span class="rc_number">1</span> <span class="rc_comment">'----- B is created inside this loop and cannot be accessed outside of this loop </span><br>
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A = A + <span class="rc_number">1</span> <span class="rc_comment">'----- A was created before this loop started so it will be able to be used after this loop ends </span><br>
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<span class="rc_keyword">Wend</span> <br>
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<br>
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<span class="rc_keyword">Print</span> B <br>
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</code></p>
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<p>
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The above program WILL NOT COMPILE. That is because the variable B was created inside the scope of the WHILE loop and nothing outside the WHILE loop will be able to access it. The variable A was created outside the WHILE loop so the variable A could be used anywhere in this example. So a variable can go into a deeper scope than where it was created but it cannot go to a lesser scope than where it was created. A scope deepens every time a new block is started. Blocks refer to the code within a loop, within a Function, or within a Sub Routine.
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</p>
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<p>
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</body>
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</html> |