Consider the following C declaration and assume that the machine has 1-byte characters, 2-byte short, 4-byte integers, 4-byte single-precision floating point numbers, 4-byte pointers, 8-byte double- precision floating-point numbers, and the compiler does not reorder fields and leaves no memory gaps. You may consider all other data types as 8-byte. union UI ( int value; char code; double data; void pointer; }; union U2 ( float func; short small [2]; }; union U3 ( B; char text; long long number; }; union U4 ( char name [6]; unsigned int id; }; struct S ( int index; union Ui item; union U4 person; void next;
Consider the following C declaration and assume that the machine has 1-byte characters, 2-byte short, 4-byte integers, 4-byte single-precision floating point numbers, 4-byte pointers, 8-byte double- precision floating-point numbers, and the compiler does not reorder fields and leaves no memory gaps. You may consider all other data types as 8-byte. union UI ( int value; char code; double data; void pointer; }; union U2 ( float func; short small [2]; }; union U3 ( B; char text; long long number; }; union U4 ( char name [6]; unsigned int id; }; struct S ( int index; union Ui item; union U4 person; void next;
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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![Consider the following C declaration and assume that the machine has 1-byte characters, 2-byte
short, 4-byte integers, 4-byte single-precision floating point numbers, 4-byte pointers, 8-byte double-
precision floating-point numbers, and the compiler does not reorder fields and leaves no memory
gaps. You may consider all other data types as 8-byte.
union U1 (
int value;
char code;
double data;
void pointer;
};
union U2 (
float func;
short small [2];
};
union U3 (
};
char text;
long long number;
};
union U4 (
char name [6];
unsigned int id;
};
struct S (
int index;
union U1 item;
union U4 person;
void next;
Answer the following questions:
1. How many bytes does each union declared in the code and struct s occupy?
2. If the memory address of S starts from 3000, what are the start addresses of S. item.pointer
and S. person.name [2]?
3. If the compiler uses a simple memory alignment mechanism that aligns variables to 8-byte
boundaries, what will be the size of S?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F12050043-4d02-4d31-b9b4-7dfbc30a9c5d%2F35c4bcc0-116c-48eb-9125-403ca76ef2c7%2F1pv52w6_processed.png&w=3840&q=75)
Transcribed Image Text:Consider the following C declaration and assume that the machine has 1-byte characters, 2-byte
short, 4-byte integers, 4-byte single-precision floating point numbers, 4-byte pointers, 8-byte double-
precision floating-point numbers, and the compiler does not reorder fields and leaves no memory
gaps. You may consider all other data types as 8-byte.
union U1 (
int value;
char code;
double data;
void pointer;
};
union U2 (
float func;
short small [2];
};
union U3 (
};
char text;
long long number;
};
union U4 (
char name [6];
unsigned int id;
};
struct S (
int index;
union U1 item;
union U4 person;
void next;
Answer the following questions:
1. How many bytes does each union declared in the code and struct s occupy?
2. If the memory address of S starts from 3000, what are the start addresses of S. item.pointer
and S. person.name [2]?
3. If the compiler uses a simple memory alignment mechanism that aligns variables to 8-byte
boundaries, what will be the size of S?
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