Learn to Program with C_ Learn to Program using the Popular C Programming Language ( PDFDrive )

Chapter 5 ■ Programs with Repetition Logic
11. A contest was held for the promotion of SuperMarbles. Each contestant was
required to guess the number of marbles in a jar. Write a program to determine the
Grand Prize winner (ignoring the possibility of a tie) based on the following:
The first line of data contains a single integer (answer, say) representing the actual number of
marbles in the jar. Each subsequent line contains a contestant’s ID number (an integer), and an
integer representing that contestant’s guess. The data is terminated by a line containing 0 only.
The Grand Prize winner is that contestant who guesses closest to answer without exceeding it.
There is no winner if all guesses are too big.
Assume all data are valid. Print the number of contestants and the ID number of the winner,
if any.
12. The manager of a hotel wants to calculate the cost of carpeting the rooms in
the hotel. All the rooms are rectangular in shape. He has a file, rooms.in, which
contains data for the rooms. Each line of data consists of the room number, the
length, and breadth of the room (in meters), and the cost per square meter of the
carpet for that room. For example, the data line:
325 3.0 4.5 40.00
means that room 325 is 3.0 meters by 4.5 meters, and the cost of the carpet for that
room is $40.00 per square meter. The last line of the file contains 0 only, indicating the
end of the data.
Write a program to do the following, sending output to the file rooms.out:
• Print a suitable heading and under it, for each room, print the room number, the
area of the room, and the cost of the carpet for the room;
• Print the number of rooms processed;
• Print the total cost of carpeting all the rooms;
• Print the number of the room that will cost the most to carpet (ignore ties).
13. The price of an item is p dollars. Due to inflation, the price of the item is expected
to increase by r% each year. For example, the price might be $79.50 and inflation
might be 7.5%. Write a program which reads values for p and r, and, starting with
year 1, prints a table consisting of year and year-end price. The table ends when
the year-end price is at least twice the original price.
14. A fixed percentage of water is taken from a well each day. Request values for W
and P where
• W is the amount (in liters) of water in the well at the start of the first day
• P is the percentage of the water in the well taken out each day
138
www.it-ebooks.info