CSCI 1300 Chapter 9: Vectors

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9 Nov 2018

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Use the size member function vectorname. size() to get the size of the vector for (int i = 0; i < values. size(); i++) cout << values[i] << endl; A vector of ten integers, filled with 1, 2, 3, , vector numbers; for (int i = 1; i <= 10; i++) numbers. push_back(i); vector numbers(10); for (int i = 0; i < numbers. size(); i++) Another way of defining a vector of ten integers and filling it with 1, 2, 3, , 10. numbers[i] = i + 1; Use the push_back member function to add more elements to a vector. When you remove an element from a vector, you want to adjust the size of the vector by calling the pop_back member function. Here is the code for removing an element at [pos] when the order doesn"t matter. int last_pos = values. size() - 1; values[pos] = values[last_pos]; // replace element at pos with last element values. pop_back(); // delete last element.

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3. Consider the following method, which returns the number of times the parameter String word occurs in the parameter array wordArray: public static int countOccurrences (String[] wordArray, String word) { int result; result = 0; for (int i = 0; i < wordArray.length; i++) { if (wordArray[i] == word) { result = result + 1; return result; Unfortunately, the above method contains a bug. This bug causes the method to return 0 instead of the expected value of 2 when it is called in the following code fragment: String[] animalism = { new String ("four"), new String ("legs"), new String ("good"), new String ("two"), new String ("legs"), new String ("bad") }; int count = count Occurrences (animalism, "legs"); System.out.println("Number of occurrences: " + count); Describe what the problem is, and suggest a simple way to fix it. BE BRIEF; overly long answers will be grounds for mark deductions.

2)What code would you add if you wanted to change it so that the user was able to continue entering a filename until the method initialize InventoryFromFile could successfully be exceuted? (e) Suppose I have the following class definition: 1 1/A TelevisionShow is a new type that consists of a String) for the actors |/ /a String for the name, and a string for the network public class Television Show private String[] actors; private String name; private String network; //this method will return whether or not the property //actors contains actor Name or not public static boolean hasActor (String actor Name) for (int i-0; i < actors.length; i++) { if (actors[i].equals (actorName)) { return true; return false; Unfortunately, when I try to compile this code, I get the following error: Television Show.java:11: non-static variable actors cannot be referenced from a static context for (int i=0; i < actors.length; i++) { Television Show.java:12: non-static variable actors cannot be referenced from a static context if (actors[i].equals(actorName)) { 2 errors What does this error mean and how can I fix it?

Recursion Question 5. In the following question, you will be asked to program the following using recursion. If you have an iterative solution, you may use it, but the most you can get for the question will be half credit. (5) points) Consider the following mathematical function h which operates on integers. (1, if n < 2 h(n) = n(n-1) +n if n > 2 and n is even han -2) +2*n if n > 2 and n is odd In Java, use recursion to write a method h which takes as input an int n and returns h (n). public static int h(int n) {

CSCI 1300 Chapter 9: Vectors

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