Major Stats

You are going to write a program which calculates results and statistics on the data from Lab 7A. The program has four modes of operation:

• RECENT, which outputs the most recent person to enter data into the system.
• TOTAL, which outputs the total number of people in the system.
• COUNT, which counts the number of people in a certain major.
• WHO, which outputs a list of the people of a certain major.

Input

The first line of input will consist of the operation mode (RECENT, TOTAL, COUNT, or WHO).

If COUNT is selected, the next line of input will consist of the major to count.

If WHO is selected, the next line of input will consist of the major to lookup.

Output

Your output should consist of the data described above. This will be on a single line except when in WHO mode, in which each person will be on a separate line.

Lab I/O Format

Your program should use the Lab Input/Output Format, as described below:

• When prompting for input, use the prompt string WORD>, where WORD is a single, uppercase word which describes the input.
• When providing output that will be graded, start the line with OUTPUT. Think of this as "boxing your answer" on a math worksheet, it lets us quickly find your answer. We will ignore any lines which do not start with OUTPUT.
• You may interleave the inputs and outputs in any order you wish. For example, you might want to recieve all of your inputs (order of inputs still matters!), then print all of your outputs (order of outputs still matters!), or you might want to do input/output, input/output, etc.

Example Interaction

recent.txt has the following contents:

Jack Rosenthal

people.txt has the following contents:

Camp,Tracy,CS
Physics,Phillip,PH
Engineer,Edward,ME
Miner,Marvin,MN
Burro,Blaster,CS
Economist,Erica,EB
Rosenthal,Jack,CS

majors.txt has the following contents:

CS
PH
ME
MN
CS
EB
CS

Here is the interaction when RECENT is typed:

MODE> RECENT
OUTPUT Jack Rosenthal

Here is the interaction when TOTAL is typed:

MODE> TOTAL
OUTPUT 7

Here is the interaction when COUNT is typed with CS as a parameter:

MODE> COUNT
MAJOR> CS
OUTPUT 3

Here is the interaction when WHO is typed with CS as a parameter (the order of the output is not important):

MODE> WHO
MAJOR> CS
OUTPUT Tracy Camp
OUTPUT Blaster Burro
OUTPUT Jack Rosenthal