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Message: [QUOTE="Kislay, post: 3079115"] case 1 : struct s { char c1[6]; // 8 double d; // 8 int i1; // 4 char c2[2]; // 4 int i2; // 4 }; case 2: struct s { char c1[6]; // 8 double d; // 8 int i1; // 4 char c2[2]; // 4 int i2; // 4 float f // 4 }; According to the rules of structure padding shouldn't the size of the above structure be 28 bytes (for a 32 bit compiler , I am using DEV-C+ +) ? But I got 32 as the answer , using sizeof . And when I added "float f" to the structure , I was getting the same answer , 32 . Well , if 32 is right instead of 28 in the first case , then after adding a float , shouldn't it become 36 ? But even in case 2 , its 32 . Is there more to structure padding than simple clubbing together in groups of 4 ? Somebody please shed some light ? [/QUOTE]