CS173: Intro to Computer Science - Strings (3 Points)

Developed by Professor Tralie and Professor Mongan.

Exercise Goals

The goals of this exercise are:
  1. To iterate over String variables.
Write a function that checks if two Strings are equal, by checking them character by character. Loop over all characters up to the length of the string, and obtain each character using the str1.charAt(i) or the str1.substring(i, i+1) method (and str2.charAt(i) or the str2.substring(i, i+1), for the other string, as well).

Enter your Ursinus netid before clicking run. This is not your ID number or your email. For example, my netid is wmongan (non Ursinus students can simply enter their name to get this to run, but they won't get an e-mail record or any form of credit).

Clicking Run below will check your work and, if it passes, will submit your work automatically. You must be connected to the VPN for submission to be successful! You will receive a copy of your code via e-mail, so you'll know that it was submitted if you receive that e-mail! VPN access requires Multi-Factor Authentication, which sends you a code when you log into the network. Instructions on configuring these for your account can be found here.


public class CompareStrings { /* * Compare the strings str1 and str2, character by character, * and return true if they are equal and the same size. * @param str1 The first string to compare * @param str2 The second string to compare * @return true if the strings are equal, false if not */ public static boolean compare(String str1, String str2) { // TODO: If str1.length() is not equal to str2.length(), return false // TODO: Loop over each character and check that str1.charAt(i) equals str2.charAt(i). // ... If not, return false // ... Hint: stop your loop at the smaller of the two string lengths (use Math.min() for this)! return true; } }


public class Driver { public static void checkEqual(String x, String y) { boolean isEqual = CompareStrings.compare(x, y); System.out.println(isEqual); } public static void main(String[] args) { String x = "bat"; String y = "bat"; checkEqual(x, y); String a = "testing"; String b = "debugging"; checkEqual(a, b); String c = "bat"; String d = "cat"; checkEqual(c, d); String s = "computer"; String t = "science"; checkEqual(s, t); String s = "bat"; String t = "bar"; checkEqual(u, v); } }