2026 03 18 Array Practice

A good variety of straightforward array exercises."

  1. Make an array xs with n numbers 101, 102, …

     q1(3) == {101, 102, 103}

  2. Total all of the numbers in ys.

     int mytot(int[] ys)

 mytot({10,20,90}) == 120

  3. Return the first 5 items of the array. If there are not 5 items, return the whole array.

     int[] take5(int [] ws)
 take5({1,2,3,10,20,30}) == {1,2,3,10,20}
 take5({6,8}) == {6,8}

  4. What is the difference between these two declarations?

     int[] xs, ys;
 int xs[], ys;

  5. Given a string containing only X and O, convert every X to a 1 and every O to a 0.

     int[] Xtobin(String str)
 Xtobin("XOOXXX") == {1,0,0,1,1,1}