CS240 Lab07 Array Random Access

Overview

Write a program that can create, read and write non-negative integer arrays of different length. No array notation "[]" is allowed in this lab.

Lab Exercise

The user is allowed to input the following four commands (c,r,w,q):

1. "c n num1 num2 num3 ..."

    This command is used to create an array of length n, and there're exactly n integers following it. No output for this command.

    eg. "c 5 1 2 3 4 5" creates an array of length 5 which contains 1,2,3,4,5

2. "r m n"

    This command is used to read the nth element from the mth array that is entered previously. If the m or n is invalid, you should output "Out of Bound". The n and m start from 0.

    eg. "r 0 0" should output "1" after the input of the above command.

        "r 1 0" and "r 0 5" should output "Out of Bound".

3. "w m n p"

    This command is used to write integer p to the nth position of the mth array. No output for this command if m and n are valid. Else output "Out of Bound".

    eg. After entering "w 0 0 7", the program should output 7 if "r 0 0" command is entered.

4. "q"

    Quit the program.

You can assume the number of creation commands will be always less than 10. The length of an individual array can be an arbitrary positive number. All the input numbers are non-negative.

Sample Output

c 5 1 2 3 4 5
c 1 6
c 3 7 8 9
c 10 10 11 12 13 14 15 16 17 18 19
c 4 20 21 22 23
r 0 4
5
r 4 3
23
r 3 3
13
r 2 3
out of bound
r 5 0
out of bound
w 0 0 24
r 0 0
24
w 4 3 25
w 4 3 26
r 4 3
26
w 4 4 7
out of bound
w 5 0 2
out of bound
q

For convenience, you can download the input file here.

Hint

As there're at most 10 arrays with different length, you can use a pointer array to store the addresses of those 10 integer arrays. The 10 integer arrays should be allocated dynamically. Again, remember, you cannot use the array notation [] for this pointer array. Also, don't forget to free the memory before your program terminates.