This function is to
get a value of root and it uses as follows.
i = @sqrt(value);
Description : Root value of the variable ¡®value¡¯ is assigned
to the variable ¡®i¡¯.
Example1)
i = @sqrt(2);
Description : The root 2 is 1.414. Thus 1.414 is assigned to the ¡®i¡¯.
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