// DebuggingPractice.java

//

// The following code is very "buggy" -- for each loop you should form a hypothesis as to

// what is causing the error and suggest how it might be corrected

class DebuggingPractice {

public static void main(String[] args)

{

// *********************************** 1 *******************************

// The following loop should sum the first 5 positive integers

// (1 + 2 + 3 + 4 + 5 = 15) but it gives no output at all. What's wrong?

int j = 1, sum = 0;

while (j <= 5);

{

sum = sum + j;

j++;

}

System.out.println("1) The sum is: " + sum);

// ********************************* 2 *********************************

// The following for loop should also sum the first 5 positive integers but

// it prints the incorrect sum. What does it print? How should you fix it?

for (j = 1, sum = 0; j < 5; j++)

sum = sum + j;

System.out.println("2) The sum is: " + sum);

// ********************************* 3 *********************************

// The following for loop should print the odd integers between 1 and 100

// What's wrong with it?

for (j = 1; j != 100; j = j + 2)

System.out.println(j);

// ********************************* 4 *********************************

// This loop should count the uppercase Xs in the String test (4)

// but it prints the answer is 3. What's wrong with it?

int count = 0;

String test = "XTHIS XX is a X test to count upper case x's";

for(int i = 1; i < test.length(); i++)

if (test.charAt(i) == 'X')

count++;

System.out.println(test + "\ncontains " + count + " Xs ");

// ********************************* 5 *********************************

// This loop should also count the uppercase Xs in test but instead it

// crashes, displaying an IndexOutOfBoundsException. What's up?

count = 0;

for(int i = 0; i <= test.length(); i++)

if (test.charAt(i) == 'X')

count++;

System.out.println(test + "\ncontains " + count + " Xs ");

// ********************************* 5 *********************************

// This loop should count the lowercase letters in a String but for the

// string below it reports there are 11 lowercase letters instead of 6. Why?

count = 0;

test = "aBCdefgHIjk";

for(int i = 0; i < test.length(); i++)

if (test.charAt(i) >= 'a' || test.charAt(i) <= 'z')

count++;

System.out.println(test + "\ncontains " + count + " lowercase letters ");

}

}