/*
* Define a variable to hold an integer or
* a real number (but not both)
*/
union value {
long int i_value; /* The real number */
float f_value; /* The floating-point number */
} data;
int i; /* Random integer */
float f; /* Random floating-point number */
main()
{
data.f_value = 5.0;
data.i_value = 3; /* data.f_value overwritten */
i = data.i_value; /* legal */
f = data.f_value; /* not legal, will generate unexpected results */
data.f_value = 5.5; /* put something in f_value/clobber i_value */
i = data.i_value; /* not legal, will generate unexpected results */
}
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