4. Size of Structures
The size of a structure in C can be greater than the sum of the sizes of its members.
To calculate the sizes of user-defined types, the compiler takes into account any alignment space   needed for complex user-defined data structures.
struct student{
    char grade;       /* char is 1 byte long */
                          /* padding */
    int age;            /* int is 4 bytes long */

printf("%zu", sizeof(struct student)); // 8
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