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<title>Built-In Constants - TMBASIC</title>
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<div class="backlinks"><a href="doc.html">TMBASIC Documentation</a></div><h1>Built-In Constants</h1>TMBASIC provides a set of constants for your convenience.
You can use these constants in your programs by name rather than writing the literal number or string values.<h2>Mathematical Constants</h2><div class="code"><div>const PI = 3.141592653589793238462643383279502</div><div>const EULER = 2.718281828459045235360287471352662</div></div><h2>Error Codes</h2>Many built-in procedures throw errors when they fail.
When catching errors, use the <a href="procedure_errorcode.html">ErrorCode</a> function to get the numeric error code.
TMBASIC provides the following constants for the error codes used by built-in procedures.<ul><li><span class="tt">ERR_INVALID_ARGUMENT = 50</span></li><li><span class="tt">ERR_INVALID_OPERATION = 51</span></li><li><span class="tt">ERR_IO_FAILURE = 100</span></li><li><span class="tt">ERR_FILE_NOT_FOUND = 101</span></li><li><span class="tt">ERR_ACCESS_DENIED = 102</span></li><li><span class="tt">ERR_PATH_TOO_LONG = 103</span></li><li><span class="tt">ERR_DISK_FULL = 104</span></li><li><span class="tt">ERR_PATH_IS_DIRECTORY = 105</span></li><li><span class="tt">ERR_PATH_IS_NOT_DIRECTORY = 106</span></li><li><span class="tt">ERR_DIRECTORY_NOT_EMPTY = 107</span></li><li><span class="tt">ERR_INVALID_PATH = 108</span></li><li><span class="tt">ERR_INTERNAL_UNICODE_ERROR = 200</span></li><li><span class="tt">ERR_INVALID_UNICODE_CODE_POINT = 201</span></li><li><span class="tt">ERR_INVALID_NUMBER_FORMAT = 202</span></li><li><span class="tt">ERR_MAP_KEY_NOT_FOUND = 300</span></li><li><span class="tt">ERR_LIST_INDEX_OUT_OF_RANGE = 301</span></li><li><span class="tt">ERR_VALUE_NOT_PRESENT = 302</span></li><li><span class="tt">ERR_INTERNAL_TYPE_CONFUSION = 303</span></li><li><span class="tt">ERR_LIST_IS_EMPTY = 304</span></li><li><span class="tt">ERR_FORM_NOT_FOUND = 400</span></li><li><span class="tt">ERR_CONTROL_NOT_FOUND = 401</span></li><li><span class="tt">ERR_INVALID_CONTROL_TYPE = 402</span></li><li><span class="tt">ERR_INVALID_DATETIME = 500</span></li><li><span class="tt">ERR_INVALID_TIMEZONE = 501</span></li><li><span class="tt">ERR_WRONG_SCREEN_MODE = 600</span></li></ul>
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