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Lesson 1















Automated Internet

Automated Editors

Sample Scripts

Precompiled Functions

System Features

  Help Page - makereal

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Function makereal Purpose Makes a real value from other types of values. Return Type real Syntax makereal(<type>(<value>)) Arguments <type> Can be real, int, str, bool. <value> A value of type <type>. This can be a constant, variable, function call, expression, inline command or a combination of these, together resulting in a value of type <type>. Return Value A constant of type real. The <value>, whether it is a variable, expression, or anything else, remains unchanged. Stream Input Streams apply to commands and not to functions. Stream Output Streams apply to commands and not to functions. Stream Error Streams apply to commands and not to functions, although any errors will be written here. Description Depending on <type>, makereal() function performs the type conversion as follows. <type> Return Value ------- ------------------------------------------------------------- real The original real value is returned. (A copy of the original real value is made.) int A real value containing the int value appended with .0 is returned. str If the str value contains a valid real constant, then that constant is returned. Else, 0.0 is returned. bool 1.0 if the bool value is true, 0.0 otherwise. Restrictions Although any type can be converted to any other type using the makeXXXX() functions, be careful, as it may sometimes produce unintended results. All system functions are declared as global, and can not be redeclared (overloaded). Valid Examples var str s var real itemPrice # The price of the item. # ... # s is assigned a string value based # on some text in a file or on a web site. set $itemPrice = makereal(str($s)) if ($itemPrice<>0.0) echo "The item price is " $itemPrice "." else echo "The item price is not available." endif Will produce either the item price or an indication that the item price is not available. Invalid Examples var str s # ... # s is assigned a string value based # on some text in a file. # We will assume that s does indeed # contain correct real value. var real r1 var real r2 set $r1 = $s # Automatic conversion. set $r2 = makereal(str($s)) # Correct coversion. $r1 assignment is incorrect, as it will be 1.0 if the string is non-empty. Else, it will be 0.0. Thus, the original real value in the string is not extracted. $r2 assignment is correct, as it extracts the original real value from the string. See Also constant var makeint makestr makebool conversion systemvar

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