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stringclasses
57 values
User Explanation
stringclasses
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Line-Explanation in PCEX
stringclasses
131 values
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5
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maxValue = values[i];
store the biggest number in the maxValue
This statement sets the maximum value to value of the element at index i of the array.
3
System.out.println("Maximum value: " + maxValue);
print the maxValue in the output screen
This statement prints the maximum value of the array to the default standard output stream.
4
if (values[i] > maxValue) {
check the condition whether its true or not
We need to compare the value at the index i of the array with the maximum value stored in variable maxValue.
1
if (values[i] > maxValue) {
check the condition whether its true or not
If the value at that index is larger than the maximum value, then we need to set the maximum value to the value of the element at index i.
1
int num = 1234;
Assign/initialize the number to be printed from left to right.
We need variable num to store the integer that we want to print its digits.
2
} while (num > 0);
Begin a loop while the number to printed is greater than 0.
We need to check for termination conditions to avoid infinite loops.
2
} while (num > 0);
Begin a loop while the number to printed is greater than 0.
The loop should terminate when we run out of digits to process.
2
} while (num > 0);
Begin a loop while the number to printed is greater than 0.
We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
3
} while (num > 0);
Begin a loop while the number to printed is greater than 0.
If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
2
} while (num > 0);
Begin a loop while the number to printed is greater than 0.
The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
2
System.out.println(num % 10);
Print the remainder when divided by 10.
Each printed digit is followed by the line separator (e.g. '\n') at the end.
1
System.out.println(num % 10);
Print the remainder when divided by 10.
We need to extract the last digit in the 1's position of the integer.
2
System.out.println(num % 10);
Print the remainder when divided by 10.
For example, if the integer is 1234, we want to extract the digit 4 that is in 1's position of the integer.
2
System.out.println(num % 10);
Print the remainder when divided by 10.
We do this by calculating the remainder of the division of the integer by 10.
3
System.out.println(num % 10);
Print the remainder when divided by 10.
Then, this statement prints the last digit of the integer to the standard output stream.
2
num = num / 10;
Divide the initial number by 10
Therefore, this division will remove the digit that we processed (lastDigit) and we can move on to the next digit.
2
num = num / 10;
Divide the initial number by 10
We truncate the extracted digit that we processed from the original integer by dividing the integer by 10.
3
num = num / 10;
Divide the initial number by 10
Note that this statement performs an integer division because both operand of the / operator are integer.
2
do {
Initiate the while loop.
We need to process the digits of the integer from right to left and print them.
1
do {
Initiate the while loop.
Therefore, we need to use a loop structure.
2
do {
Initiate the while loop.
In this program, we do this by using a do loop.
2
do {
Initiate the while loop.
The do loop is more appropriate than a while loop because a positive integer always has at least one digit which results in the body of the loop performing at least once.
1
Scanner scan = new Scanner(System.in);
Initialize the variable in which the user input will be scanned and stored.
To read the input values from the user, we need to define a Scanner object.
2
Scanner scan = new Scanner(System.in);
Initialize the variable in which the user input will be scanned and stored.
We need to read and process the values that the user enters.
1
System.out.println("Enter the phone age in years:");
Print the text asking the user to input the age of the phone in years.
We prompt the user to enter the phone age in years.
4
int phoneAge = scan.nextInt();
Scan the next token as an integer.
We read the phone age by calling the nextInt() method because this input is an integer.
2
int phoneAge = scan.nextInt();
Scan the next token as an integer.
We need to read the phone age that the user enters and store it in a variable.
2
System.out.println("Enter whether the phone is broken (true or false):");
Print the text asking the user to enter whether the phone is broken or not.
We prompt the user to enter whether the phone is broken.
4
boolean isBroken = scan.nextBoolean();
Scan the next token of the user input for a boolean value and store it.
We need to read whether the phone is broken and store it in a variable.
3
boolean isBroken = scan.nextBoolean();
Scan the next token of the user input for a boolean value and store it.
The variable isBroken is true when the phone is broken, and false otherwise.
1
boolean isBroken = scan.nextBoolean();
Scan the next token of the user input for a boolean value and store it.
We read whether the phone is broken by calling the nextBoolean() method because this input is a boolean.
3
int phoneAge = scan.nextInt();
Scan the next token as an integer and store it.
We read the phone age by calling the nextInt() method because this input is an integer.
3
int phoneAge = scan.nextInt();
Scan the next token as an integer and store it.
We need to read the phone age that the user enters and store it in a variable.
3
scan.close();
Close the scanner.
We close the scanner as we do not want to process any input from the user in the rest of the program.
3
boolean needPhone = isBroken || phoneAge >= 3;
Set boolean variable if the phone is broken or the phone age is greater than 3 years.
We use the || operator (called or) to combine the two conditions.
2
boolean needPhone = isBroken || phoneAge >= 3;
Set boolean variable if the phone is broken or the phone age is greater than 3 years.
The first condition is to test if the phone is broken and the second condition is to test if the phone age is at least 3 years old.
3
boolean needPhone = isBroken || phoneAge >= 3;
Set boolean variable if the phone is broken or the phone age is greater than 3 years.
We need two conditions to determine if it is the time for a new phone.
1
System.out.println(needPhone);
Print whether new phone needs to be bought.
This statement prints true/false depending on whether it is time to buy a new phone.
3
System.out.println(needPhone);
Print whether new phone needs to be bought.
The printed value is followed by an end-of-line character in the end.
1
String fullName = "John Smith"
Initialize/assign the name whose initials should be printed.
We define a string variable to hold the name.
3
String firstInitial = fullName.substring(0, 1);
Get the first letter of the first name (John).
We need to extract the first letter from the first name.
4
String firstInitial = fullName.substring(0, 1);
Get the first letter of the first name (John).
We do this by calling the substring(0,1) method.
1
String lastInitial = fullName.substring(5, 6);
Get the first letter of the Last name(Smith).
We need to extract the first letter from the last name.
4
String lastInitial = fullName.substring(5, 6);
Get the first letter of the Last name(Smith).
We do this by calling the substring(5,6) method.
1
String initials = firstInitial + lastInitial;
Combine the first letter of the first name and the first letter of the last name.
This statements concatenates the extracted initials and store the result in the string initials.
4
System.out.println(initials);
Print the initials.
This statement prints the initials to the default standard output stream.
4
System.out.println(initials);
Print the initials.
The printed value is followed by the end-of-line character at the end.
1
String firstInitial = fullName.substring(0, 1);
Get the first letter of the First name (John).
We need to extract the first letter from the first name.
4
String firstInitial = fullName.substring(0, 1);
Get the first letter of the First name (John).
We do this by calling the substring(0,1) method.
1
int[] values = {5, 8, 4, 78, 95, 12, 1, 0, 6, 35, 46};
Initialize the array containing the list of integers.
We define array values to hold the specified numbers.
3
int[] values = {5, 8, 4, 78, 95, 12, 1, 0, 6, 35, 46};
Initialize the array containing the list of integers.
We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
2
int maxValue = values[0];
Assume the first value in the array to be the maximum value and assign it to the variable.
We need variable maxValue to store the maximum value of the array.
1
int maxValue = values[0];
Assume the first value in the array to be the maximum value and assign it to the variable.
We initialize this variable by the first value in the array because we initially assume that the first value is the maximum.
4
for (int i = 1; i < values.length; i++) {
Initiate a for loop that loops over the elements of the array.
We use a for loop to iterate over the remaining array indexes and search for the maximum value.
3
for (int i = 1; i < values.length; i++) {
Initiate a for loop that loops over the elements of the array.
We need the array indexes to start at 1 with every integer number up to but not including the array length.
2
int maxValue = values[0];
Assume the first element of the array to be the maximum value and assign it to the variable.
We need variable maxValue to store the maximum value of the array.
2
int maxValue = values[0];
Assume the first element of the array to be the maximum value and assign it to the variable.
We initialize this variable by the first value in the array because we initially assume that the first value is the maximum.
4
if (values[i] > maxValue) {
Check if the loop variable (element of the array) is greater than the previously assigned maximum value,
We need to compare the value at the index i of the array with the maximum value stored in variable maxValue.
3
if (values[i] > maxValue) {
Check if the loop variable (element of the array) is greater than the previously assigned maximum value,
If the value at that index is larger than the maximum value, then we need to set the maximum value to the value of the element at index i.
3
maxValue = values[i];
If so, assign the corresponding element to be the maximum value.
This statement sets the maximum value to value of the element at index i of the array.
2
System.out.println("Maximum value: " + maxValue);
Print the maximum value of the array once all the elements of the array are looped over.
This statement prints the maximum value of the array to the default standard output stream.
4
int maxValue = values[0];
Assume the first element of the array to be the maximum value and assign it to the variable 'maxValue'.
We need variable maxValue to store the maximum value of the array.
2
int maxValue = values[0];
Assume the first element of the array to be the maximum value and assign it to the variable 'maxValue'.
We initialize this variable by the first value in the array because we initially assume that the first value is the maximum.
4
if (values[i] > maxValue) {
Check if the loop variable (element of the array) is greater than the previously assigned maximum value.
We need to compare the value at the index i of the array with the maximum value stored in variable maxValue.
2
if (values[i] > maxValue) {
Check if the loop variable (element of the array) is greater than the previously assigned maximum value.
If the value at that index is larger than the maximum value, then we need to set the maximum value to the value of the element at index i.
3
maxValue = values[i];
If so, assign the corresponding element to be the maximum value.
This statement sets the maximum value to value of the element at index i of the array.
2
if (values[i] > maxValue) {
Check if the element of the array corresponding to the loop variable is greater than the previously assigned maximum value.
We need to compare the value at the index i of the array with the maximum value stored in variable maxValue.
2
if (values[i] > maxValue) {
Check if the element of the array corresponding to the loop variable is greater than the previously assigned maximum value.
If the value at that index is larger than the maximum value, then we need to set the maximum value to the value of the element at index i.
2
for (int num = 2; num <= 10; num += 2) {
Initiate a for loop over the set of even positive integers less than or equal to 10.
To do this, we need to use a loop structure.
2
for (int num = 2; num <= 10; num += 2) {
Initiate a for loop over the set of even positive integers less than or equal to 10.
We need to repeat the same process for each of the even positive integers that are less than or equal to 10.
3
for (int num = 2; num <= 10; num += 2) {
Initiate a for loop over the set of even positive integers less than or equal to 10.
To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop.
2
for (int num = 2; num <= 10; num += 2) {
Initiate a for loop over the set of even positive integers less than or equal to 10.
We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop.
2
for (int num = 2; num <= 10; num += 2) {
Initiate a for loop over the set of even positive integers less than or equal to 10.
Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10.
3
System.out.println(num + " squared = " + (num * num));
Print the the square of the number by multiplying the number with itself.
The multiplication may also be performed directly in the println statement.
3
System.out.println(num + " squared = " + (num * num));
Print the the square of the number by multiplying the number with itself.
Note that we do not necessarily have to store the squared number in a variable.
1
System.out.println(num + " squared = " + (num * num));
Print the the square of the number by multiplying the number with itself.
To square each number in the sequence, we multiply it by itself using the multiplication (*) operator.
3
System.out.println(num + " squared = " + (num * num));
Print the the square of the number by multiplying the number with itself.
In each iteration of the loop, this statement prints the square number to the default standard output stream.
2
Scanner scan = new Scanner(System.in);
initiate scanner class which is helpful in reading the input
To read the input values from the user, we need to define a Scanner object.
4
Scanner scan = new Scanner(System.in);
initiate scanner class which is helpful in reading the input
We need to read and process the values that the user enters.
2
System.out.println("Enter the phone age in years:");
print a prompt "Enter the phone age in years" into the console
We prompt the user to enter the phone age in years.
4
int phoneAge = scan.nextInt();
read the input from the console to variable phone age
We read the phone age by calling the nextInt() method because this input is an integer.
2
int phoneAge = scan.nextInt();
read the input from the console to variable phone age
We need to read the phone age that the user enters and store it in a variable.
2
System.out.println("Enter whether the phone is broken (true or false):");
show a prompt on console "Enter whether the phone is broken (true or false):"
We prompt the user to enter whether the phone is broken.
4
boolean isBroken = scan.nextBoolean();
read the input from the console onto variable isBroken
We need to read whether the phone is broken and store it in a variable.
2
boolean isBroken = scan.nextBoolean();
read the input from the console onto variable isBroken
The variable isBroken is true when the phone is broken, and false otherwise.
2
boolean isBroken = scan.nextBoolean();
read the input from the console onto variable isBroken
We read whether the phone is broken by calling the nextBoolean() method because this input is a boolean.
2
scan.close();
closing the scanner class to end the process of reading the input from console
We close the scanner as we do not want to process any input from the user in the rest of the program.
4
boolean needPhone = isBroken || phoneAge >= 3;
check weather the phone is broken or phone age is greater than or equals to 3 then set the variable needPhone to TRUE
We use the || operator (called or) to combine the two conditions.
2
boolean needPhone = isBroken || phoneAge >= 3;
check weather the phone is broken or phone age is greater than or equals to 3 then set the variable needPhone to TRUE
The first condition is to test if the phone is broken and the second condition is to test if the phone age is at least 3 years old.
3
boolean needPhone = isBroken || phoneAge >= 3;
check weather the phone is broken or phone age is greater than or equals to 3 then set the variable needPhone to TRUE
We need two conditions to determine if it is the time for a new phone.
3
System.out.println(needPhone);
print the value of variable needPhone
This statement prints true/false depending on whether it is time to buy a new phone.
2
System.out.println(needPhone);
print the value of variable needPhone
The printed value is followed by an end-of-line character in the end.
1
for (int num = 2; num <= 10; num += 2) {
loop until the num value less than or equals to 10; start the num value at 2 and increment by 2 in each iteration
To do this, we need to use a loop structure.
2
for (int num = 2; num <= 10; num += 2) {
loop until the num value less than or equals to 10; start the num value at 2 and increment by 2 in each iteration
We need to repeat the same process for each of the even positive integers that are less than or equal to 10.
3
for (int num = 2; num <= 10; num += 2) {
loop until the num value less than or equals to 10; start the num value at 2 and increment by 2 in each iteration
To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop.
4
for (int num = 2; num <= 10; num += 2) {
loop until the num value less than or equals to 10; start the num value at 2 and increment by 2 in each iteration
We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop.
2
for (int num = 2; num <= 10; num += 2) {
loop until the num value less than or equals to 10; start the num value at 2 and increment by 2 in each iteration
Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10.
3
System.out.println(num + " squared = " + (num * num));
print square value of the num in the each iteration in the console
The multiplication may also be performed directly in the println statement.
1
System.out.println(num + " squared = " + (num * num));
print square value of the num in the each iteration in the console
Note that we do not necessarily have to store the squared number in a variable.
1
System.out.println(num + " squared = " + (num * num));
print square value of the num in the each iteration in the console
To square each number in the sequence, we multiply it by itself using the multiplication (*) operator.
2