Answered: During the sockets lab we cast the…

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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Question

During the sockets lab we cast the second parameter from a struct sockaddr_in to a struct sockaddr.

struct sockaddr_in address;

/* ... */

bind(server_fd, (struct sockaddr*)&address, sizeof(address))

This provides a limited form of polymorphism: bind only needs the first few fields of its struct, and both struct sockaddr_in and struct sockaddr have the same fields at those addresses.

Consider the following example:

typedef struct {

float x;

float y;

float z;

} point3D;

typedef struct {

float x;

float y;

} point2D;

float distance(point2D *a1, point2D *a2) {

/* ... */

}

int main() {

point2D a = { .x = 2.1, .y = 3.0 };

point3D b = { .x = 4.1, .y = 4.3, .z = 4.0 };

// Call distance function with a and b

}

How would you pass a and b to the distance function? If several work, pick one that will not create warnings.

A. distance(a, b);

B. distance(a, (point2D)b);

C. distance(&a, &b);

D. distance(&a, &(point2D)b);

E. distance(&a, (point2D*)&b);

F. none of the above

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