Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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A miniature robot designed to mimic the
behavior of an ant is being tested to evaluate
the robot’s ability to avoid a chemical
repellant (the robot has a chemical sensor,
and a control loop that makes the robot
avoid moving in a direction that will result
in the sensor detecting a chemical
concentration above a certain limit). The x
and y positions of the robot are measured
with time, and the resulting data is saved to
a file called data.txt which contains 3
columns: the time of the measurement (in seconds), the x position (in cm), and the y position (in cm).
The first line of the file is a “header”: it has a single integer that specifies how many lines of data follow.
Write a C++ program called ant.cpp that reads files of this type (i.e., your program should work
with another, but similar, file!) and then does the following: it asks for an X and Y position, and then
prints to screen the time at which the ant robot was closest to this position. For example, if we wish
to know when the robot is closest to x = 200cm and y = 400cm (the red dot shown in the plot), your
program should produce:
Enter x & y position: 200 400
The smallest distance is 54.7068 cm, which occurs at 67.2 seconds.

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x (cm)
(ua) A
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Transcribed Image Text:900 800 700 600 500 > 400 300 200 100 50 100 150 200 250 300 350 x (cm) (ua) A
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