In this tutorial, we will talk about how we can use the plist in the application to store information. Let’s first understand what is plist. What is plist? The plist file is also called the property list and is used by operating systems (e.g. iOS) and users. The information is stored in a key-value format similar to a dictionary. A plist file can contain different types of values like strings, arrays, dictionaries, booleans, dates, data, and numbers, such as integers. Most of these types correspond to native Swift types, such as Array and Bool. You can also store nested arrays ... Read More

A number is said to be a tech number, when an even digit number is divided into exactly two parts and the square value of the sum of those two numbers is equal to the original number. For more clarification, we take a number which has even digits. After that, divide it into two parts and add two parts. After getting the sum value, we calculate the square of it. Now we compare both the calculated square value and the original/input number. If both are same then we can say that the input number is a tech number otherwise ... Read More

A number is said to be a Tcefrep number, if the reverse of that number is equal to the sum of the proper divisors of the original number. For more clarification, we find the sum of the divisors of a number and find the reverse of the original number. If both the sum value and the reverse of the given number are the same then we can say that the given number is a Tcefrep number. Some examples of Tcefrep numbers are: 6, 498906, 20671542 ... etc. In this article, we will see how to check if a ... Read More

A number is said to be a Strontio number, if we multiply 2 with a four-digit number then in the resultant number the tens place and hundreds place digits are the same. In simple terms, Strontio numbers are basically four-digit numbers. When we multiply 2 with it, it results in a number whose tens place and hundred places are exactly the same. Some examples of Strontio numbers are- 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 1001 ... etc. In this article, we will see how to check if a number is a strontio number by using Java ... Read More

A number is said to be a pointer prime number, if the sum of the product value of digits and the original prime number results in the next prime number. For more clarification, we take a prime number and multiply the digits with each other and add that multiplication value with the original number. After that if we get another prime number which is next to the original prime number. Then we can say that the number is a pointer prime number. Some examples of pointer prime numbers are: 23, 61, 1123, 1231 ... etc. In this article, ... Read More

What is a Narcissistic Number? A number is said to be a Narcissistic number, only if the addition (or sum) of the value of each digit raised to the power of the total number of digits available in the original number is equal to the original number. Examples of narcissistic numbers, such as 153, 1634, 54748, etc. All single-digit numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) are Narcissistic numbers because the power of 1 of any digit will be the digit itself. The following input and output scenarios will help you understand the problem and calculation ... Read More

What is a Mersenne Number? A Mersenne number is a positive integer that is obtained using the expression M(n)= 2n-1, where 'n' is an integer. If you keep any value of n (e.g., 0, 1, 2, 3) in the above expression, the result will be a Mersenne number. For example, consider n = 2 and calculate the expression 22 - 1. The result is 3, which is a Mersenne number. Not all Mersenne numbers are prime (e.g., 24 - 1 = 15) is a mersenne number, which is not prime. Here are some other examples of Mersenne numbers: ... Read More

What is Empire Number? A number is said to be an Empire number if it is a prime number, and when we reverse that number, we should get another prime number. For example, let's consider the number 17. We know that 17 is a prime number, and if we reverse this number, we get 71, which is also a prime number. Therefore, 17 is known as an empire number. Here are some other examples of prime numbers such as 11, 13, 17, etc. Input & Output Scenarios Below are a few input and output scenarios that help to understand the ... Read More

Complex numbers are a very fundamental concept in modern science, the concept is first introduced in the early 17th century. Complex numbers are of the form a + ib, where a and b are real numbers. a is known as the real part and ib is known as the imaginary part of a complex number. In C++, there is a class to represent complex numbers which is the complex class. The complex class in C++ can represent and manipulate various operations on complex numbers. We take a look at how to represent, initialize, and display complex numbers. Initializing using the ... Read More

Complex numbers in C++ are available in the header and it enables a developer to represent and manipulate complex numbers. Complex numbers have the form a + ib, where 'a' is referred to as the complex number's real portion and 'ib' is the number's imaginary part. The imaginary portion is denoted by the letter 'i' whose value is "iota" which is equal to -1. Complex numbers are extremely important in many programs since they are employed in many mathematical and scientific processes. We take a look at how to represent complex numbers in C++ and how to convert a ... Read More