Extra Questions on Arrays_practise_answers.pdf - Extra Questions on Arrays(single and 2D and methods These questions are not available on Codio Rather

Extra Questions on Arrays_practise_answers.pdf - Extra...

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Extra Questions on Arrays (single and 2D) and methods. These questions are not available on Codio. Rather, you will need to use another IDE to write and test the code. These are practise questions only – they are NOT the questions that will be on the practicum. Question1 In your main method, use a Scanner object to first read in one int (n) that represents the size of an array of Strings, followed by a set of (n) Strings on one line. There will be one final String which will contain a single character. Go through the array and print all the Strings that begin with that character (upper or lower case) (no need to create a method for this – just do it in the main method). For example: Sample Input Sample Output 3 Canada calculate divide c 4 dog cat bird snake S Canada calculate snake Code: import java.util.Scanner; public class ArrayOfStrings { public static void main (String []args ){ //create Scanner to read in size of array and set of Strings Scanner kb = new Scanner (System.in); int size = kb.nextInt(); String [] arr = new String [size]; //add Strings to the array by reading Strings from Scanner object for (int i=0;i<size;i++) arr[i]=kb.next(); /*read in the String and get the char that will be used to go through the array to print out Strings that start with the char*/ char ch = kb.next().charAt(0); //go through array and print word if it starts with char for (int i=0; i<arr.length; i++){ if (arr[i].toLowerCase().charAt(0)==ch || arr[i].toUpperCase().charAt(0)==ch) System.out.print(arr[i] + " "); } } }
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Question2 In your main method, use a Scanner object to first read in one int (n) that represents the size of an array of doubles, followed by a set of (n) doubles on one line. Go through the array and print every other element, starting at 0. (no need to create a method for this – just do it in the main method). Be careful of out bound errors. For example: Sample Input Sample Output 3 1 2 3.5 6 2.2 3 4 5.6 3.4 1.2 1.0 3.5 2.2 4.0 3.4 Code: import java.util.Scanner; public class ArrayOfDouble { public static void main (String []args ){ //create Scanner to read in size of array and set of double values Scanner kb = new Scanner (System.in); int size = kb.nextInt(); double [] arr = new double [size]; //add numbers to the array by reading doubles from Scanner object for (int i=0;i<size;i++) arr[i]=kb.nextDouble(); //print out every other element in the array starting at 0 for (int i=0;i<arr.length; i++) if (i%2==0) //will print out every other 'even' indice System.out.print(arr[i] + " "); } } Question3 Suppose you had a company with 10 employees and you stored their names in an array. Then if you hired 5 new employees, you would need to make a new array of size 15 (10 + 5) and copy over the original employees before being able to add the new employees to the array.
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  • Fall '12
  • MacKay

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