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Programming Articles
Page 1479 of 2547
Can we initialize static variables in a default constructor in Java?
Class/static variables belong to a class, just like instance variables they are declared within a class, outside any method, but, with the static keyword.They are available to access at the compile time, you can access them before/without instantiating the class, there is only one copy of the static field available throughout the class i.e. the value of the static field will be same in all objects. You can define a static field using the static keyword.If you declare a static variable in a class, if you haven’t initialized it, just like with instance variables compiler initializes these with default values ...
Read MoreMinimum operations to make GCD of array a multiple of k in C++
Suppose we have an array arr and another value k. We have to find a minimum number of operations to make the GCD of the array equal to the multiple of k. In this case, the operation is increasing or decreasing the value. Suppose the array is like {4, 5, 6}, and k is 5. We can increase 4 by 1, and decrease 6 by 1, so it becomes 5. Here a number of operations is 2.We have to follow these steps to get the result −Steps −for all elements e in the array, follow steps 2 and 3if e ...
Read MoreHow to find the Strings within a text file in Java?
Following Java program accepts a String value from the user, verifies whether a file contains the given String and prints the number of occurrences of the word too.Exampleimport java.io.FileInputStream; import java.io.FileNotFoundException; import java.util.Scanner; public class FindingWordFromFile { public static void main(String args[]) throws FileNotFoundException { //Reading the word to be found from the user Scanner sc1 = new Scanner(System.in); System.out.println("Enter the word to be found"); String word = sc1.next(); boolean flag = false; int count = 0; System.out.println("Contents ...
Read MoreMinimum positive integer divisible by C and is not in range [A, B] in C++
Suppose we have three integers A, B, and C. We have to find one minimum integer X, such that X mod C = 0, and X is not in the range [A, B]. If the values of A, B and C are 5, 10 and 4 respectively, then the value of X will be 4. Let us see the steps to get the solution −Steps −If C is not in the range [A, B], then return C as a resultOtherwise get the first multiple of C, which is greater than B, then return that valueExample#include using namespace std; int ...
Read MoreException Hierarchy in case of multiple catch blocks.
An exception is an issue (run time error) that occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed.Multiple exceptions in a codeWhenever we have a code that may generate more than one exception and if you need to handle them specifically you can use multiple catch blocks on a single try.try{ //code } catch(Exception1 ex1) { // } catch(Exception2 ex2) { // }Exampleimport java.util.Arrays; import java.util.Scanner; public class MultipleCatchBlocks { public static void main(String [] args) ...
Read MoreHow to read/write data from/to .properties file in Java?
The .properties is an extension in java which is used to store configurable application. It is represented by the Properties class in Java, you can store a properties file and read from it using the methods of this class. This class inherits the HashTable class.Creating a .properties file −To create a properties file −Instantiate the Properties class.Populate the created Properties object using the put() method.Instantiate the FileOutputStream class by passing the path to store the file, as a parameter.ExampleThe Following Java program creates a properties file in the path D:/ExampleDirectory/import java.io.FileOutputStream; import java.io.IOException; import java.util.Properties; public class CreatingPropertiesFile { ...
Read MoreFind GCD of factorial of elements of given array in C++
Suppose we have an array A, with N elements. We have to find the GCD of factorials of all elements of the array. Suppose the elements are {3, 4, 8, 6}, then the GCD of factorials is 6. Here we will see the trick. As the GCD of two numbers, is the greatest number, which divides both of the numbers, then GCD of factorial of two numbers is the value of factorial of the smallest number itself. So gcd of 3! and 5! is 3! = 6.Example#include using namespace std; long fact(int n){ if(n arr[i]) ...
Read MoreFind HCF of two numbers without using recursion or Euclidean algorithm in C++
As we know, the HCF or GCD can be calculated easily using the Euclidean Algorithm. But here we will see how to generate GCD or HCF without using the Euclidean Algorithm, or any recursive algorithm. Suppose two numbers are present as 16 and 24. The GCD of these two is 8.Here the approach is simple. If the greater number of these two is divisible by the smaller one, then that is the HCF, otherwise starting from (smaller / 2) to 1, if the current element divides both the number, then that is the HCF.Example#include using namespace std; int gcd(int ...
Read MoreWhich packages contain Wrapper class in Java?
Java provides certain classes called wrapper classes in the java.lang package. The objects of these classes wrap primitive datatypes within them. Following is the list of primitive data types and their respective classes −Primitive datatypeWrapper classcharCharacterbyteByteshortShortintIntegerlongLongfloatFloatdoubleDoublebooleanBooleanPackageWrapper classes in Java belong to the java.lang package, Therefore there is no need to import any package explicitly while working with them.ExampleThe following Java example accepts various primitive variables from the user and creates their respective wrapper classes.import java.util.Scanner; public class WrapperClassesExample { public static void main(String args[]){ Scanner sc = new Scanner(System.in); System.out.println("Enter an integer value: ...
Read MoreFind if a point lies inside a Circle in C++
Suppose, one circle is given (the center coordinate and radius), another point is also given. We have to find whether the point is inside the circle or not. To solve it, we have to find the distance of the given point from circle center. If that distance is less or equal to the radius, then that is inside the circle, otherwise not.Example#include #include using namespace std; bool isInsideCircle(int cx, int cy, int r, int x, int y) { int dist = (x - cx) * (x - cx) + (y - cy) * (y - cy); if ( dist
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