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UNIONS

The syntax for defining and using unions is identical to that for structs.

    union    input_value
    {
        int    i;
        float    f;
    };

Unlike a struct, however, declaring a variable of this type allocates space for only the LARGEST member in the union.  When a value is assigned to one of the members, any value formerly associated with another member is lost; that is, only one member contains a value at a time.  This property is useful when the programmer would like to define a variable which can take on values of different types at different points in  his/her program.

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