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The operation of a union

#include <stdio.h> void main() { union u_example { float decval; int pnum; double my_value; } U1; U1.my_value = 223.5; U1.pnum = 10; U1.decval = 200.5f; printf("\ndecval = %f pnum = %d my_value = %lf", U1.decval, U1.pnum, U1.my_value ); printf("\nU1 size = %d\ndecval size = %d pnum size = %d my_value size = %d", sizeof U1, sizeof U1.decval, sizeof U1.pnum, sizeof U1.my_value); }