h.sysvar

来自「强大的数学工具包」· SYSVAR 代码 · 共 31 行

                               * * * * * * *
                               *   sysvar  *
                               * * * * * * *

        "system variable"

        The result of a computation that is not assigned to a specified
        variable using the '=' operator is automatically assigned to the 
        system variable '@'.
        
        It is not allowed to assign a value explicitly to '@'.


        Example 1: (incorrect)
 
                @ = 5
                
_ERR_NR_005


        Example 2: 

                8
                message on the screen: @ = 8
 
                @ + x
                message on the screen: @ = x + 8

                @(x=3)
                message on the screen: @ = 11