# VS2010 C++ POINT LINE CEG217 - 52461

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CEG 2170

Laboratory 9

1. A point in a plane can be represented by two coordinates, x and y. We can represent a point in a plane by

a data type named POINT, using a structure having two fields as shown:

typedef struct

int x;

int y;

}POINT;

Write a program that determines whether a variable of type POINT is located in the right half of the x-y

plane (x > 0), or not. The program should prompt the user to enter point data from the keyboard, and should

use a function that accepts a structure representing a point and returns true or false, based on where the point

is located.

2. Modify the program to include a second structure that models a line, which consists of two points,

using the structure definition as shown:

typedef struct

POINT start;

POINT end;

}LINE;

Write a function that accepts a structure of type LINE and returns the length of the line. Read in data for two

points from the keyboard, and test this function. Page 2 of 2

3. Write a program that will create an array of line structures. The data for each line will be in a file named

linedata.txt in the following format:

//number of lines in the file

Xstart

….

Ystart Xend Yend

//integer starting and ending points of line 1

Xstart Ystart Xend Yend

//integer starting and ending points of line N

a. Read the number of lines, N

b. Create an array of LINE’s with N elements

c. Print the array data to the screen.

d. Use qSort to sort the array by line length. e. Print the sorted array to the screen.

Run your code again using the input file linedata1.txt. You should not need to modify your

program in any way.

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VS2010 C+

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