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Type inference (or type deduction) refers that the compiler can figure out the datatype of a variable or expression automatically, without the programmer needing to write it out. This feature is available in many strongly typed languages like C++, where the type system is strict but the compiler helps to reduce the typing effort. Following is the simple example to understand the type deduction in C++. #include using namespace std; int main() { // Let the compiler deduce the type from the value auto number = 50; // int auto pi = 3.14; // double cout
In C++, the keywords signed and unsigned are used to specify that a given variable can hold negative values or only positive values. In this article, we will learn the differences between these two in more detail. C++ signed Keyword The signed keyword specifies that the given variable can hold both positive and negative values. Most integers, like int, short, long, etc, are by default signed (meaning they can store both positive and negative values). When an integer is represented in binary form, the most significant bit (MSB) or the leftmost bit represents the sign of the integer. When the most significant ... Read More
In this article, we will learn how to insert all elements from one list into another in Java. This is a general operation we perform when working with lists while solving problems in Java. We will cover the following methods to insert all elements from one list into another: Using addAll() Method Using For Loop Using Stream API Using ListIterator Using addAll() Method We can add all elements of one list into another list easily using its addAll() method. This method appends all of the elements in the specified collection to the end of this list, in the ... Read More
Yes, we can insert null values into a list easily using its add() method. In case of List implementation does not support null, then it will thrown a NullPointerException List is an interface in Java that extends the Collection interface and provides a way to store an ordered collection of elements. It allows us to store duplicate elements, and it also maintains the order of insertion. The List interface is implemented by classes such as ArrayList, LinkedList, and Vector. Null Values in a Java List In Java, a List can contain null values. The List interface allows for the insertion of ... Read More
An octahedron is a three-dimensional (3D) shape which has eight plane faces. In other words, a polyhedron is called an octahedron which has eight faces, twelve edges, and 6 vertices. A polygonal is a three-dimensional figure with flat polygonal faces, straight edges, and sharp corners or vertices. The word octahedron is derived from the Greek word that is Oktaedron, which means Eight faces. Here is the diagram of the octahedron, which has side a: Volume of octahedron The volume of an octahedron is the amount of space occupied by the octahedron. To calculate the volume of an octahedron, we ... Read More
What is Keith Number? A number is said to be a Keith number if it is arranged with a special sequence of numbers, which are initially created by its digits. The number sequence will be generated by adding its previous numbers till the number exceeds the input number. The results will be decided if the end number is exactly the same as the input number. For example, let's consider the number 14. The sequence will be as follows: s1 = 1, 4 s2 = 1, 4, 1 + 4 s3 = 1, 4, 5, 4 + 5 s4 = ... Read More
A dodecahedron is a three-dimensional shape that has twelve flat faces. It is derived from two Greek words, i.e., 'dodeka', which means 12, and 'hedra', which means face. In other words, a dodecahedron is a special type of polyhedron that has 12 faces. To make a dodecahedron, you can use the 12 pyramids and the base as a pentagon. Following diagram will provide a better understanding of its shape and edges: Where a is the length of the edge. Volume of Dodecahedron A dodecahedron volume refers to the amount of space occupied by this 3D shape, which has 12 faces. ... Read More
What is Goldbach Number? A number is said to be a Goldbach number if the number can be expressed as the addition of two odd prime number pairs. For example, let's consider the number 98 and find the pairs of prime numbers (19, 79). If you calculate the sum of 19 + 79, you get 98, so 98 is a Goldbach number. If we follow the above condition, then we can find that every even number larger than 4 is a Goldbach number because it must have any pair of odd prime number pairs. But the odd numbers are not satisfying because we know ... Read More
In Java, both double and float are data types that are used to declare a variable that can store only decimal values or floating point numbers. For example: 1.2343, 3.343, 24.321234, etc. The double data type is larger in size compared to the float data type. When to Prefer Double Type Over Float Type A double-type is preferred over a float-type if a more precise and accurate result is required. The precision of double-type is up to 15 to 16 decimal points, while the precision of float type is only around 6 to 7 decimal digits. Following are the syntaxes for ... Read More
A Triangular number of a natural number n, which is defined as the sum of all natural numbers starting from 1 to n. It is called triangular as we can represent it in the form of an equilateral triangular grid by using the total number of points where the row number equals the point number, which means in the 1st row 1 point, in the 2nd row 2 points, in the 3rd row 3 points, and so on. Examples of triangular numbers are 1, 3, 6, 10, 21, 55, etc. In simple terms, we can say a number is a ... Read More