[SOLVED] C: meet_up Homework 3

Homework 3 Time it took Matthew to Complete: 40 mins

• All programs must compile without warnings when using the -Wall and -Werror options
• Submit only the files requested

  Do NOT submit folders or compressed files such as .zip, .rar, .tar, .targz, etc

• Your program must match the output exactly to receive credit.

  Make sure that all prompts and output match mine exactly.

  Easiest way to do this is to copy and paste them

• All input will be valid unless stated otherwise
• Print all real numbers to two decimal places unless otherwise stated
• The examples provided in the prompts do not represent all possible input you can receive.
• All inputs in the examples in the prompt are underlined

  You dont have to make anything underlined it is just there to help you differentiate between what you are supposed to print and what is being given to your program

• If you have questions please post them on Piazza

  Restrictions

• No global variables are allowed
• Your main function may only declare variables, call other functions, and assign

  variables values.

  Assumptions

Input is NOT guaranteed to be valid

If invalid input is entered your program should continue to ask the user for input until valid input is entered

Files to submit: meet_up.c

For this problem we have two pieces, P1 and P2, randomly placed on a R X C board. R is the number of rows and C is the number of columns. Each round P1 and P2 attempt to move closer together by moving a random amount towards the other pieces current position. Your job is to figure out the average number of rounds it takes for P1 and P2 to arrive at the same spot.

Input Constraints

• Seed: an integer
• Number of rows: an integer greater than 0
• Number of columns: an integer greater than 0
• Number of rounds: an integer greater than 0

  Randomness

• In order to match the tester output you must make calls to rand in the exact order that I do
• For each simulation

  Generate the starting row number for P1
  Generate the starting column number for P1 Generate the starting row number for P2
  Generate the starting column number for P2

• For each round in a simulation
  • If P1 and P2 are on different rows generate a random new row position for P1

    This value should be between [P1 srow ,P2 srow]

  • If P1 and P2 are on different columns generate a random new column position for P1

This value should be between [ P1 s column , P2 s column ]
If P1 and P2 are on different rows generate a random new row position for P2

This value should be between [P2 srow ,P1 srow]
If P1 and P2 are on different columns generate a random new column position for P2

This value should be between [ P2 s column , P1 s column ]

Additional Requirements

In order to help with debugging if the number of simulations to run is less than or equal to 5 your program should print out the following information
The starting positions of P1 and P2
Where P1 and P2 move to each round

Worked Examples

Here are some examples on a 3 X 3 board that show you the state of the board after each move. Piece 1 is represented by X and Piece 2 by O. When they land on the same spot only X is shown.

Example 1

Since the pieces move towards the other pieces current position sometimes they can end up passing each other.

Piece one starts at: 0, 1Piece two starts at: 1, 2

0*X * 1** O 2** *

01 2
First piece moves from 0,1 to 0,2 Second piece moves from 1,2 to 1,1

0** X 1*O * 2** *

01 2
First piece moves from 0,2 to 0,2 Second piece moves from 1,1 to 0,2

0** X 1** * 2** *

01 2

Example 2

Piece one starts at: 1, 2Piece two starts at: 0, 0

0O* * 1** X 2** *

01 2
First piece moves from 1,2 to 1,1 Second piece moves from 0,0 to 0,0

0O* * 1*X * 2** *

01 2
First piece moves from 1,1 to 0,0 Second piece moves from 0,0 to 0,0

0X* * 1** * 2** *

01 2

Example 3

Since the pieces move towards the other pieces current position sometimes they can end up passing each other. Sometimes a piece might not choose to move at all

Piece one starts at: 1, 1Piece two starts at: 0, 1

0*O * 1*X * 2** *

01 2
First piece moves from 1,1 to 0,1 Second piece moves from 0,1 to 1,1

0*X * 1*O * 2** *

01 2
First piece moves from 0,1 to 0,1 Second piece moves from 1,1 to 1,1

0*X * 1*O * 2** *

01 2
First piece moves from 0,1 to 1,1 Second piece moves from 1,1 to 0,1

0*O * 1*X * 2** *

01 2
First piece moves from 1,1 to 1,1 Second piece moves from 0,1 to 1,1

0** * 1*X * 2** *

01 2

Real Examples

1. Enter the seed for the random number generator: 10

 Enter the number of rows on the board: 5 Enter the number of columns on the board: 7 Enter the number of simulations to run: 2 Simulation 0

 Piece one starts at: 0, 0 Piece two starts at: 3, 0 First piece moves from 0,0 to 2,0 Second piece moves from 3,0 to 2,0

 Simulation 1 Piece one starts at: 0, 2 Piece two starts at: 2, 5 First piece moves from 0,2 to 2,3 Second piece moves from 2,5 to 2,4 First piece moves from 2,3 to 2,3 Second piece moves from 2,4 to 2,3

 On average it takes 1.50 rounds on a board 5 X 7 for the pieces

to meet.
2. Enter the seed for the random number generator: 12

 Enter the number of rows on the board: 5 Enter the number of columns on the board: 2 Enter the number of simulations to run: 3 Simulation 0

 Piece one starts at: 0, 0 Piece two starts at: 4, 0 First piece moves from 0,0 to 3,0 Second piece moves from 4,0 to 4,0 First piece moves from 3,0 to 4,0 Second piece moves from 4,0 to 3,0 First piece moves from 4,0 to 3,0 Second piece moves from 3,0 to 3,0

 Simulation 1 Piece one starts at: 3, 1 Piece two starts at: 2, 0 First piece moves from 3,1 to 3,1 Second piece moves from 2,0 to 3,1

 Simulation 2 Piece one starts at: 2, 0 Piece two starts at: 2, 0

 On average it takes 1.33 rounds on a board 5 X 2 for the pieces to meet.

3. Enter the seed for the random number generator: -34

 Enter the number of rows on the board: 10 Enter the number of columns on the board: 10 Enter the number of simulations to run: 50 On average it takes 3.22 rounds on a board 10 X 10 for the pieces to meet.

4. Enter the seed for the random number generator: bob Enter the seed for the random number generator: what Enter the seed for the random number generator: -12 Enter the number of rows on the board: cats

 Enter the number of rows on the board: dogs Enter the number of rows on the board: 0 Enter the number of rows on the board: -2 Enter the number of rows on the board: 20 Enter the number of columns on the board: man Enter the number of columns on the board: woman Enter the number of columns on the board: 0 Enter the number of columns on the board: -2 Enter the number of columns on the board: 3- Enter the number of columns on the board: 30 Enter the number of simulations to run: 100

 On average it takes 3.98 rounds on a board 20 X 30 for the pieces to meet.