Assignment 16.1: Vowels Again
- Write a method with the following signature:
public static int countVowels(string str)
The method returns a count of the letters in the string parameter that are vowels (A, E, I, O, U, a, e, i, o, u)
- Hint: You've done this same thing on your previous assignment, just not with a method.
- For this assignment we are going to "outsource" the work of counting vowels to a method named countVowels.
Part 1:
- Copy and paste the starter code into a class named Vowels:
//add your javadoc comment here!
int countVowels(string s)
{
//add the code for your function here
}
public static void main(String[] args)
{
String sentence;
int numVowels;
//Prompt user to enter a sentence
//call the countVowels method, passing it the sentence as a parameter
//& storing result as numVowels
//print out the number of vowels in the sentence
System.out.println("There are " + numVowels + " in your sentence.");
}
- Your program should first prompt the user to enter a sentence.
- Then, you should pass the sentence variable into your method and store the return value in your numVowels variable.
- Test out your code with various sentences.
- The program should now work like this:
Enter a sentence: I love cookies a lot!
There are 9 vowels in your sentence.
Part 2:
- Add a while loop to your code to repeatedly prompt the user to enter a sentence or q to quit.
- The program should accept q, Q, quit, or Quit as signals to exit the loop.
- When you are finished, your program should work like this:
Enter a sentence or q to quit: I love cookies a lot!
There are 9 vowels in your sentence.
Enter a sentence or q to quit: I wouldn't mind a piece of cake, either.
There are 14 vowels in your sentence.
Enter a sentence or q to quit: Q
Goodbye!
- When you are certain it is working properly submit to Canvas.
Assignment 16.2: Getting Methodical
- Copy and paste the starter code into a new file called Methodical.java
- Write the required methods as described by the comments (i.e. you fill in the body of the method).
- Then, run the code when you are finished to see if you wrote the methods correctly.
- Check the test results and make any alterations to your methods as necessary.
- When all of the tests pass, upload your code to Canvas.
/*
* @author
* CIS 36A
*
*/
public class Methodical {
/*
* Given two int values, returns their sum.
* Unless the two values are the same, then return double their sum.
* sumDouble(1, 2) → 3
* sumDouble(3, 2) → 5
* sumDouble(2, 2) → 8
*/
public static int sumDouble(int a, int b){
return 0;
}
/*
* Given 2 ints, a and b, return true if one of them is 10
* or if their sum is 10.
* makes10(9, 10) → true
* makes10(9, 9) → false
* makes10(1, 9) → true
*/
public static boolean makes10(int a, int b) {
return false;
}
/*
* We have two monkeys, a and b, and the parameters
* aSmile and bSmile indicate if each is smiling.
* We are in trouble if they are both smiling
* or if neither of them is smiling.
* Return true if we are in trouble.
* monkeyTrouble(true, true) → true
* monkeyTrouble(false, false) → true
* monkeyTrouble(true, false) → false
*/
public static boolean monkeyTrouble(boolean aSmile, boolean bSmile) {
return false;
}
/*Return true if the given non-negative number is a multiple of 3
* or a multiple of 5. Use the % "modulus" operator
* or35(3) → true
* or35(10) → true
* or35(8) → false
* */
public static boolean or35(int a) {
return false;
}
/*
* Given a string, return a new string where "not " has been added to the front.
* However, if the string already begins with "not", return the string unchanged.
* notString("candy") → "not candy"
* notString("x") → "not x"
* notString("not bad") → "not bad"
*/
public static String notString(String str) {
return "";
}
/*
* Given a string, return a new string where the first and last chars have been exchanged
* frontBack("code") → "eodc"
* frontBack("a") → "a"
* frontBack("ab") → "ba"
*/
public static String frontBack(String str) {
return "";
}
/*
* We'll say that a number is "teen" if it is in the range 13..19 inclusive.
* Given 3 int values, return true if 1 or more of them is/are teen.
* hasTeen(13, 20, 10) → true
* hasTeen(20, 19, 10) → true
* hasTeen(20, 10, 13) → true
*/
public static boolean hasTeen(int num1, int num2, int num3) {
return false;
}
public static void main(String[] args)
{
int result;
boolean answer;
String value;
System.out.println("***Testing sumDouble***\n");
result = sumDouble(1, 2);
System.out.println("Should print 3: " + result);
result = sumDouble(3, 2);
System.out.println("Should print 5: " + result);
result = sumDouble(2, 2);
System.out.println("Should print 8: " + result +"\n");
System.out.println("***Testing makes10***\n");
answer = makes10(9, 10);
System.out.println("Should be true: " + answer);
answer = makes10(9, 9);
System.out.println("Should be false: " + answer);
answer = makes10(1, 9);
System.out.println("Should be true: " + answer + "\n");
System.out.println("***Testing monkeyTrouble***\n");
answer = monkeyTrouble(true, true);
System.out.println("Should be true: " + answer);
answer = monkeyTrouble(false, false);
System.out.println("Should be true: " + answer);
answer = monkeyTrouble(true, false);
System.out.println("Should be false: " + answer + "\n");
System.out.println("***Testing or35***\n");
answer = or35(3);
System.out.println("Should be true: " + answer);
answer = or35(10);
System.out.println("Should be true: " + answer);
answer = or35(8);
System.out.println("Should be false: " + answer + "\n");
System.out.println("***Testing notString***\n");
value = notString("candy");
System.out.println("Should be not candy: " + value);
value = notString("x");
System.out.println("Should be not x: " + value);
value = notString("not bad");
System.out.println("Should be not bad: " + value + "\n");
System.out.println("***Testing frontBack***\n");
value = frontBack("code");
System.out.println("Should be eodc: " + value);
value = frontBack("a");
System.out.println("Should be a: " + value);
value = frontBack("ab");
System.out.println("Should be ba: " + value + "\n");
System.out.println("***Testing hasTeen***\n");
answer = hasTeen(13, 20, 10);
System.out.println("Should be true: " + answer);
answer = hasTeen(20, 19, 10);
System.out.println("Should be true: " + answer);
answer = hasTeen(20, 10, 13) ;
System.out.println("Should be true: " + answer);
answer = hasTeen(20, 10, 45) ;
System.out.println("Should be false: " + answer + "\n");
System.out.println("***End of Tests***");
}
}