THIS IS A PRELIMINARY VERSION.
THERE MAY BE CHANGES.

READ THE WHOLE FILE AND DO SO CAREFULLY.

DO NOT TURN THIS IN WITH THE turnin PROGRAM BEFORE
     5 AM Saturday, January 18. If you finish before then, just
     wait a while before turning it in. Also, check for
     changes before turning it in.

CSE 10  UCSD Winter, 1997
Assignment 3
Deadlines: 
For turnin program: Thursday Jan 23
For interview: Wednesday  Jan 29

Reading: Chapters 3 and Section 4.1 of Chapter 4
         all in the Savitch text

Programming: 
In this exercise you will start with a partially
written program and fill in the missing code.
In most cases what is missing are function definitions.
The program with the blanks to fill in 
is in the file hw03.template. You must fill in
some missing code in the main part of the program
and you must give four function definitions.

The completed  program will ask the user if he/she
wants to convert from miles to kilometers or
from kilometers to miles. 
The user responds with  M or m for
the first case and with K or k for the second case.
If the user responds with any thing else, he/she is
asked the question again, and again until
an appropriate response is made.
The program will then ask for the appropriate
input and compute the appropriate answer.
The program then repeats this action again and
again until the user says to quit.
More specifically, after doing one calculation,
the program asks:

Do you want to do it again? 
Enter Y for yes or N for no.

The user responds with Y, y, N , or n.
If the user responds with anything else,
the user is asked again and again until
the user responds with one of these four letters.

To see what the dialogue should be like you can
run hw03.o which contains the compiled object
code from a solution to this assignment.

Details:

>Your definition of the function from_miles_or_from_kilometers
must use a local variable named ans.

>You do not need to define any functions besides those
whose prototypes are given in hw03.template.

>Be sure to place all function definitions after
main and to leave the function prototypes before
main.

>The function new_line(), whose prototype is
given below, takes zero arguments.
This function will disregard all the input remaining on
a line so that the next time there is a cin, the input
will be taken from the next line. The definition of
new_line is given in hw03.template. You do not
need to understand the definition. You only need
to know how to use the function new_line.
This function will allow the user to enter "yes"
when the program wants only the letter y and the call
to new_line will throw away the e and the s.
Run hw03.o and try it to see how it works.

void new_line();
//Discards all the input remaining on the current input line.

>The function from_miles_or_from_kilometers, takes no arguments
and returns one of the two letters, uppercase 'M' or uppercase 'K'.
This function is unlike any in the text book in that it
gets it's information by carrying on a dialogue
with the user, rather than having any arguments.
Run the sample object code to see what this dialogue
should be like. 

>The function get_yes_or_no is similar to 
from_miles_or_from_kilometers in that it also
gets it's information by carrying on a dialogue
with the user, rather than having any arguments.

>It is good programming practice to check the user's input.
Your program must check any character input to see
that the user typed in one of the appropriate letters
(such as Y, y, N, or n as an answer to a yes/no question).
When the user is asked for a number, you do not have to
check the input to see if it is appropriate (because it's
still to hard for you to do it).

>Your input/output must be identical to that of hw03.o