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Articles on Trending Technologies
Technical articles with clear explanations and examples
Find One's Complement of an Integer in C++
In this section, we will see how to find the 1’s complete of an integer. We can use the complement operator to do this task very fast, but it will make 32bit complemented value (4-bype integer). Here we want complement of n bit numbers.Suppose we have a number say 22. The binary equivalent is 10110. The complemented value is 01001 which is same as 9. Now the question comes, how to find this value? At first we have to find number of bits of the given number. Suppose the count is c (here c = 5 for 22). We have ...
Read MoreCan we have generic constructors in Java?
Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class as generic you are making it type-safe i.e. it can act up on any datatype.To define a generic class you need to specify the type parameter you are using in the angle brackets “” after the class name and you can treat this as datatype of the instance variable an ...
Read MoreA Product Array Puzzle in C++?
Here we will see one interesting problem related to array. There is an array with n elements. We have to create another array of n elements. But the i-th position of second array will hold the product of all elements of the first array except the i-th element. And one constraint is that we cannot use the division operator in this problem.If we can use the division, operation, we can easily solve this problem, by getting the product of all elements, then divide i-th element of first array and store it into i-th place of the second array.Here we are ...
Read MoreArray elements with prime frequencies in C++?
Array is a container of elements of same data type.Prime Frequencies means that the number of occurrence of the element of the array is a prime number.So, based on these definitions the problem to find array elements with prime frequencies. We are given a string of array. We have to find the frequency of characters and check if frequency is prime and then count elements that have prime frequencies.Let’s take an example, Input: str = “helloworld” Output: 2ExplanationCount of occurrences of characters are −h -> 1 e -> 1 l -> 3 o -> 2 w-> 1 r -> 1 ...
Read MoreHow can we restrict Generics (type parameter) to sub classes of a particular class in Java?
Whenever you want to restrict the type parameter to subtypes of a particular class you can use the bounded type parameter. If you just specify a type (class) as bounded parameter, only sub types of that particular class are accepted by the current generic class.You can declare a bound parameter just by extending the required class with the type-parameter, within the angular braces as −class Sample Examplepublic class BoundsExample { public static void main(String args[]) { Sample obj1 = new Sample(20); obj1.display(); Sample obj2 = new Sample(20.22d); ...
Read MoreCheck if a binary string has a 0 between 1s or not in C++
Here we will see one interesting problem. We have to check whether a string has 0 in between a 1s or not. If not, then the string is valid, otherwise invalid.Suppose there are three strings −100011110100000111110001111101111From these three strings, only B is valid, because there is no 0 inside the stream of 1sTo solve this problem, we will find the index of first 1 present in the string, and also find the index of the last 1. Then we will check, is there any 0 from these two indices, if so, then return false, otherwise true (as valid)Example#include using ...
Read MoreAbsolute Difference of even and odd indexed elements in an Array (C++)?
Here we will see how we can get the absolute differences of odd and even indexed elements in an array. The absolute difference indicates that if the difference of one pair is negative, the absolute value will be taken. For an example, let the numbers are {1, 2, 3, 4, 5, 6, 7, 8, 9}. So the even position elements are 1, 3, 5, 7, 9 (starting from 0), and odd place elements are 2, 4, 6, 8. So the difference for even placed data are |1 - 3| = 2, then |2 - 5| = 3, |3 - 7| ...
Read MoreHow do we initialize an array within object parameters in java?
You can initialize the array variable which is declared inside the class just like any other value, either using constructor or, using the setter method.ExampleIn the following Java example, we are declaring an instance variable of array type and initializing it from the constructor.public class Student { String name; int age; String subs[]; Student(String name, int age, String subs[]){ this.name = name; this.age = age; this.subs = subs; } public void display() { System.out.println("Name: "+this.name); System.out.println("Age :"+this.age); System.out.print("Subjects: "); for(int i = 0; i < subs.length; i++) { ...
Read MoreActivity Selection Problem (Greedy Algo-1) in C++?
There are n different activities are given with their starting time and ending time. Select maximum number of activities to solve by a single person.We will use the greedy approach to find the next activity whose finish time is minimum among rest activities, and the start time is more than or equal with the finish time of the last selected activity.The complexity of this problem is O(n log n) when the list is not sorted. When the sorted list is provided the complexity will be O(n).InputA list of different activities with starting and ending times.{(5, 9), (1, 2), (3, 4), ...
Read MoreIs it possible to check if a String only contains ASCII in java?
Using regular expressionYou can find whether a particular String value contains ASCII characters using the following regular expression −\A\p{ASCII}*\zThe matches() method of the String class accepts a regular expression and verifies whether the current string matches the given expression if so, it returns true, else it returns false.Therefore, Invoke the matches() method on the input/required string by passing the above specified regular expression as a parameter.Exampleimport java.util.Scanner; public class OnlyASCII { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter a string value: "); String input = ...
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