Answered: Effects on Size and Padding A flexible…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Effects on Size and Padding
A flexible array member is treated as having no size when calculating the size of a structure, though padding
between that member and the previous member of the structure may still exist:
/* Prints "8,8" on my machine, so there is no padding. */
printf("%zu,%zu\n", sizeof(size_t), sizeof(struct ex1));
/* Also prints "8,8" on my machine, so there is no padding in the ex2 structure itself. */
printf("%zu,%zu\n", sizeof(struct ex2_header), sizeof(struct ex2));
/* Prints "5,8" on my machine, so there are 3 bytes of padding. */
printf("%zu,%zu\n", sizeof(int) + sizeof(char), sizeof(struct ex3));
The flexible array member is considered to have an incomplete array type, so its size cannot be calculated using
sizeof.

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