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Programming Articles
Page 1310 of 2547
Unreachable Code Error in Java
Unreachable code error occurs when the code can’t be compiled due to a variety of reasons, some of which include: infinite loop, return statement before the unreachable line of code.Let us see an example −Examplepublic class Demo{ public static void main(String args[]){ int val = 5; for (;;){ if (val == 5){ break; System.out.println("If the condition is not true, this line would be printed. "); } } } }Output/Demo.java:11: ...
Read MoreUsing TreeMap to sort User-defined Objects in Java
To sort user-defined object in Java, the code is as follows −Exampleimport java.io.*; import java.util.*; public class Demo{ static void sort_objects(String my_data){ String[] my_vals = my_data.split(" "); Map my_map = new TreeMap(); for (int i = 1; i < my_vals.length; i += 2){ int my_age = Integer.parseInt(my_vals[i]); String name = my_vals[i - 1]; if (my_map.containsKey(my_age)){ ArrayList my_list = my_map.get(my_age); my_list.add(name); ...
Read MoreUsing predefined class name as Class or Variable name in Java
Using a predefined class name as a class nameLet us see an example −Examplepublic class Number{ public static void main (String[] args){ System.out.println("Pre-defined class name can be used as a class name"); } }OutputPre-defined class name can be used as a class nameThe class Number has a main function that displays a message when it is executed. The main function takes string values as arguments.Using a predefined class name as a variable nameLet us see an example −Examplepublic class String{ public static void main (java.lang.String[] args){ System.out.println("Pre-defined class name can be ...
Read MoreInorder Traversal of a Threaded Binary Tree in C++
Here we will see the threaded binary tree data structure. We know that the binary tree nodes may have at most two children. But if they have only one children, or no children, the link part in the linked list representation remains null. Using threaded binary tree representation, we can reuse that empty links by making some threads.If one node has some vacant left or right child area, that will be used as thread. There are two types of threaded binary tree. The single threaded tree or fully threaded binary tree.For fully threaded binary tree, each node has five fields. ...
Read MoreUsing underscore in Numeric Literals in Java
Followig is the code showing how to use underscore in numeric literals in Java −Examplepublic class Demo{ public static void main (String[] args) throws java.lang.Exception{ int my_num_1 = 6_78_00_120; System.out.println("The number is : " + my_num_1); long my_num_2 = 2_00_11_001; System.out.println("The number is : " + my_num_2); float my_num_3 = 4.01_981F; System.out.println("The number is : " + my_num_3); double my_num_4 = 12.89_46_061; System.out.println("The number is : " + my_num_4); } }OutputThe number is : ...
Read MoreFind combined mean and variance of two series in C++
ConceptWith respect of two given two different series arr1[b] and arr2[a] of size b and a. Our task is to determine the mean and variance of combined series.InputArr1[] = { 24, 46, 35, 79, 13, 77, 35 }; Arr2[] = { 66, 68, 35, 24, 46 };OutputMean1: 44.1429 Mean2: 47.8 StandardDeviation1: 548.694 StandardDeviation2: 294.56 Combined Mean: 45.6667 d1 square: 2.322 d2_square: 4.5511 Combined Variance: 446.056MethodNow suppose, n1= No. of observations in 'region 1'n2= No. of observations in 'region 1'X1= mean of region 1.X2=mean of region 2.S1=standard deviation of region 1.S2=standard deviation of region 2.S12 = variance of region 1.S22 = ...
Read MoreWays to read input from console in Java
Let us see some ways to read input from console in Java −Exampleimport java.util.Scanner; public class Demo{ public static void main(String args[]){ Scanner my_scan = new Scanner(System.in); String my_str = my_scan.nextLine(); System.out.println("The string is "+my_str); int my_val = my_scan.nextInt(); System.out.println("The integer is "+my_val); float my_float = my_scan.nextFloat(); System.out.println("The float value is "+my_float); } }OutputThe string is Joe The integer is 56 The float value is 78.99A class named Demo contains the main function. An instance of the ...
Read MoreFind d to maximize the number of zeros in array c[] created as c[i] = d*a[i] + b[i] in C++
ConceptWith respect of two given arrays of M integers, assume an array C, where the i-th integer will be d*a[i] + b[i] where d is indicated as any arbitrary real number. Our task is to display or print d such that array C has largest number of zeros and also prints the number of zeros.Inputa[] = {15, 40, 45} b[] = {4, 5, 6}OutputValue of d is: -0.133333 The number of zeros in array C is: 1 If we choose d as -0.133333 then we get one zero in the array C which is the maximum possible.MethodsWe follow the below ...
Read MoreFind Duplicates of array using bit array in C++
ConceptWe have an array of n numbers, where n is maximum 32, 000. Now the given array may have duplicate entries and we do not know what n is. Now the question is arisen that with only4 Kilobytes of memory available, how would display or print all duplicates elements in the array?Inputarr[] = {2, 6, 2, 11, 13, 11}Output2 11 2 and 11 appear more than once in given array.Inputarr[] = {60, 50, 60}Output60MethodsNow we have 4 Kilobytes of memory which indicates we can address up to 8 * 4 * 210 bits.It should be noted that 32 * 210 ...
Read MoreCount Magic squares in a grid in C++
We are given with a matrix of numbers. The goal is to find the number of Magic squares present inside the given matrix.A Magic Square, if taken as a matrix, is a 3X3 matrix which contains the elements ranging from 1 to 9 just like a grid in Sudoku. Properties are −All numbers occur exactly once.Sum of all 9 cells in the matrix is 45.Sum of each row of 3 is 15.Sum of each column of 3 is 15.Sum of diagonals of 3 is 5.To get such sums, 5 is always in the middle of both diagonals.Inputint arr[][]= { { ...
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