Tuesday March 13, 2012 11:00am
Assignment 1
Course No. CS1124
Course Title Computer Programming
Deadline: Monday 19th March, 2012 12:00pm
The Story:
Today when you were entering the university you realized that our beloved university, MAJU, is
facing traffic problems on the main gate. A guard has to be always there to direct the traffic.
You being an efficient CS student offer your services to resolve this issue. You suggest that
traffic lights be inserted on the three roads meeting at MAJU gate. Traffic moves out of gate
through one road (let us call it the “out-road”) and can come in from two roads (let us call these
“in-road1” and “in-road2”). You are now writing the software for traffic lights on these three
roads (i.e. out-light, in-light1 and in-light2 respectively).
Each traffic light stays green for 3 seconds, yellow for 1 second and red for 8 seconds (we
assume traffic is moving at the speed of light for this assignment!). The lights turn green in this
order: out-light, in-light1, in-light2.
You can represent the three signals of a traffic light: red, yellow and green, by the characters
‘R’, ‘Y’ and ‘G’ respectively. The on signal can be represented by writing the word “on” with
respective signal, e.g. if green is on for in-light1, this state can be represented as:
In-Light1: R Y G(on)
You have to display a timer too and change the signals accordingly.
The Program:
Your program starts by prompting user to enter a timer value. The program then displays lights’ statuses
for decrementing timer values till the timer turns down to 0.
Then the program asks the user if he wants to enter another timer value.
1. If user enters y or Y, the program should repeat the above procedure.
2. If user enters n or N, the program stops after printing a greeting message.
3. If user enters any other character, the program prompts him to answer with yes or no only and
asks again if he wants to enter another timer value.
Sample Run:
Here is a sample run of your program:
docsity.com
