Can I initialize unions?
ANSI Standard C allows an initializer for the first member of a union. There is no standard way of initializing any other member (nor, under a pre-ANSI compiler, is there generally any way of initializing a union at all).
References:
K&R2 Sec. 6.8 pp. 148-9
ANSI Sec. 3.5.7
ISO Sec. 6.5.7
H&S Sec. 4.6.7 p. 100
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