no ,if u r using 32 bit machine . that will use 4 byte pointer size ,
but   in 64 machine that enforce to be size of 8 . where padding will take
int your given first structure

so for 32 bit- size will 8 8 for both structure
for 64 bit - size will 16 and 12 respectively cause of 4 bit padding in one
structure

hence 2nd structure is good for use

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