Selected Topics in IT

HTML and CSS (part 49): Center align the legend of a html form in Firefox using CSS

Java 109: How do interfaces support multiple inheritance in Java?

Java 38: Dealing with NullPointerException in java arrays.

Python 1: Installing Spyder for Python

C# 37: Print the timetable from 1 to 10 using nested loops - add a horizontal line between rows

Python 14: Round a number to 0, 1 or 2 decimal places using the round() function.

C# 40: Reverse an array of chars, strings and numbers using Array.Reverse()

jQuery 11: Explicitly clear the form fields when the page is reloaded

C# 4: Finding the average of 4 numbers entered by user

Python 15: How to write a comment in Python

C++ 43: Check if cin successfully placed a value into a variable (integer).

C++ 4: How to print double quotations inside in a string in a cout statement

Python 39: How the AND (&) bitwise operator works.

Python 68: Instance vs class variables/attributes

C 18: Define, initialize from user input, and display structures

Java 19: 2-dimensional (2D) arrays

HTML and CSS (part 46): What does the required attribute in an input HTML element mean

Java 42: Use a do-while loop to display the user menu until the user decides to quit

C# 10: Check if an entered number falls within a specific range, if not, re-enter

Python 5: Math operations

C# 9: Check if an entered number falls within a specific range or not

Java 106: Upcasting (Child to Parent) and downcasting (Parent to Child)

Java 78: parseBoolean() vs the nextBoolean() method

Python 35: Find odd/even numbers using the modulus operator.

Java 105: Abstract classes

Java 60: What is encapsulation and getter/setter methods?

Python 44: Check if a string is composed of lower/upper case letters using islower()/isupper()

Java 53: NumberFormatException versus InputMismatchException

jQuery 6: Inline css styling in jQuery

Java 40: A program that performs simple math operation with user menu, switch statements and methods

C++ 3: Print a double to 2 decimal places using setprecision and fixed (iomanip).

C++ 64: Make a number stop rounding to 2 decimals after rounding the previous one.

HTML and CSS (part 37): Create a multiple-choice (MCQ) assessment using radio buttons and a form.

Java 68: Child class explicitly calls a parent’s constructor and toString() using the super keyword

Java 44: Throw and handle an ArithmeticException when a division by zero is attempted (try/catch).

Running a PHP page on webserver (MAMP) vs Running a PHP without a webserver.

Python 53: Find the datatype of a variable using the type function

Python 67: Show a number in 3 decimal places without rounding using the floor method

PHP and MySQL 9: Reduce the risks of SQL injection attacks using prepared statements.

C# 30: Read lines of text from a file using StreamReader, and print the lines with line numbers

Java 10: Count the number of digits in a string input using the charAt() method using for loops

Python 30: Difference between the list datatype methods pop and remove.

jQuery 5: Link to an external jQuery file

Java 61: Method or function? What is the difference?

C++ 18: Using sizeof to get the size of an array

Python 70: Find the name of the current module using the special variable __name__

Python 71: Special variable __name__ and special value __main__, how they work together

Python 24: Adding items to a list using append, and finding the length of the list using len

JavaScript 5: How do I use the console for find a JavaScript error?

C++ 10: Let user specify the size of array, enter their values, calculate and print their average.