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Message: [QUOTE="James Hu, post: 1684009"] [good stuff snipped] If you knew for sure that struct mystruct did not have any padding bits (and you can not portably determine this), or if you knew that struct mystruct is always initialized in a way such that all its padding bits are zero (such as allocated by calloc(), or was initialized by a call to memset(p, '\0', sz)), you could have used the function memcmp(). { static const struct mystruct z; if(memcmp(&mystruct1, &z)) { print("All elements of mystruct1 is zero"); } } But, Richard's suggestion is the most straight forward and less error prone. -- James [/QUOTE]