Programming Solutions

Write a java program to calculate product of each column in matrix :  import java.util.Random; import java.util.Scanner; public class ColumnWiseProduct { public static void main(String[] args) { ColumnWiseProduct cwp=new ColumnWiseProduct(); int arr[][]=cwp.readmatrix(); cwp.dispMat(arr); int prod[]=cwp.prodColWise(arr); System.out.println("Entered matrix Column wise product is :"); cwp.dispSingleArray(prod); } int[] prodColWise(int mat[][]){ int prod[]=new int[mat[0].length]; for(int i=0;i<mat[0].length;i++) { prod[i]=1; for(int j=0;j<mat.length;j++) { prod[i]=prod[i]*mat[j][i]; } } return prod; } int[][] readmatrix(){ Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { for(int...

Write a java program to calculate sum column wise in a matrix: import java.util.Random; import java.util.Scanner; public class ColumnWiseLeast { public static void main(String[] args) { int mat[][]=readmatrix(); dispMat(mat); System.out.println("Sum of Diagonal element is : "); int arr[]=leastColWise(mat); dispSingleArray(arr); } static int[] leastColWise(int mat[][]) { int least[]=new int[mat[0].length]; for(int i=0;i<mat[0].length;i++) { least[i]=mat[0][i]; for(int j=0;j<mat.length;j++) { if(least[i]>mat[j][i]) { least[i]=mat[j][i]; } } }return least; } static int[][] readmatrix(){ Random rx=new Random(); Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { fo...

Write a java program to sum of Diagonal elements in matrix: import java.util.Random; import java.util.Scanner; public class SumOfDiagonalElements { public static void main(String[] args) { int arr[][]=readmatrix(); dispMat(arr); int sum[]=sumOfDiagonal(arr); System.out.println("primary Diagonal element sum is : "+sum[0]); System.out.println("Secondary Diagonal element sum is :"+sum[1]); } static int[] sumOfDiagonal(int mat[][]) { int []sum=new int[2]; int n=mat.length; for(int i=0;i<n;i++) { for(int j=0;j<n;j++) { if(i==j) { sum[0]=sum[0]+mat[i][j]; } if(i+j==n-1) { sum[1]=sum[1]+mat[i][j]; } } } return sum; } static int[][] readmatrix(){ Random rx=new Random(); Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row]...

Write a java program to Rotate matrix 90 degree left and rotate 90 degree right :  import java.util.Random; import java.util.Scanner; public class RotateMatrix { public static void main(String[] args) { System.out.println("Enter matrix : "); int arr[][]=readmatrix(); System.out.println("Matrix is : "); dispMat(arr); int arr2[][]=rotate90Left(arr); System.out.println("90 Degree left rotate matrix is :"); dispMat(arr2); System.out.println("90 degree right rotate Matrix is :"); arr=rotate90Right(arr); dispMat(arr); } static int[][] rotate90Left(int mat[][]){ ColumnWiseReverse cw=new ColumnWiseReverse(); mat=transposeMat(mat); cw.colWiseReverse(mat); return mat; } static int[][] rotate90Right(int mat[][]){ RowWiseReverse rw=new RowWiseReverse(); mat=transposeMat(mat); rw.rowWiseReverse(mat); return mat; } static int[][] transposeMat(int m[][])...

Write a java program to count negative number in a matrix : import java.util.Scanner; public class CountNegValue { public static void main(String[] args) { int a[][]=readmatrix(); dispMat(a); int count=countNeg(a); System.out.println("Entered negative number is : "+count); } static int[][] readmatrix(){ Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { for(int j=0;j<col;j++) { mat[i][j]=sc.nextInt(); } }return mat; } static void dispMat(int mat[][]) {   for(int i=0;i<mat.length;i++) { for(int j=0;j<mat[i].length;j++) { System.out.print(mat[i][j]+" "); }System.out.println(); }   } static int countNeg(int mat[][]) { int count=0; ...

Write a java program to calculate sum of each element of matrix using Random input :  import java.util.Random; import java.util.Scanner; public class SumOfMatrixElement { static Random rx=new Random(); public static void main(String[] args) { System.out.println("Enter a matrix : "); int [][]mat=readmatrix(); dispMat(mat); int sum=sumOfMatrix(mat); System.out.println("Sum of matrix is : "+sum); } static int[][] readmatrix(){ Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { for(int j=0;j<col;j++) { mat[i][j]=rx.nextInt(50); } }return mat; } static void dispMat(int mat[][]) {   for(int i=0;i<mat.length;i++) { for(int j=0;j<mat[i].le...

Write a java program to find biggest element from matrix using random input :  import java.util.Random; import java.util.Scanner; public class BiggestElementMatrix { static Random rx=new Random(); public static void main(String[] args) { System.out.println("Enter a matrix : "); int [][]mat=readmatrix(); int big=biggestMatrix(mat); System.out.println("Matrix is "); dispMat(mat); System.out.println("Biggest element is : "+big); } static int[][] readmatrix(){ Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { for(int j=0;j<col;j++) { mat[i][j]=rx.nextInt(50); } }return mat; } static int biggestMatrix(int[][] mat) { int temp=0; for(i...

Write a java program to add two matrices :  import java.util.Scanner; public class AddTwoMatrix { public static void main(String[] args) { System.out.println("Enter Read first matrix : "); int[][] a=readmatrix(); System.out.println("Enter second matrix : "); int b[][]=readmatrix(); int res[][]=addMat(a, b); System.out.println("First matrix is : "); dispMat(a); System.out.println("Second matrix is : "); dispMat(b); System.out.println("Result matrix is : "); dispMat(res); }  static int[][] readmatrix(){ Scanner sc=new Scanner(System.in); System.out.println("Enter Row size and column size :"); int row=sc.nextInt(); int col=sc.nextInt(); int mat[][]=new int[row][col]; System.out.println("Enter Elements in Table : "); for(int i=0;i<row;i++) { for(int j=0;j<col;j++) { mat[i][j]=sc.nextInt(); } }return mat; ...

Write a java program to check two string is Anagram or not :  import java.util.Scanner; class Anagram { public static void main(String[] args) { Scanner sc=new Scanner(System.in); System.out.println("Enter first Sentence "); String st=sc.nextLine(); int[] string1=indexNumber(st); System.out.println("Enter Second Sentence "); String st2=sc.nextLine(); int[] string2=indexNumber(st2); CompareTwoArray ct=new CompareTwoArray(); boolean rs=ct.isAnagram(string1, string2); if(rs) { System.out.println("String is anagram "); } else { System.out.println("Not a anagram"); } } static int[] indexNumber(String str) { int count[]=new int[26]; for(int i=0;i<str.length();i++) { char ch=str.charAt(i); if(ch>=65 && ch<=90) { count[ch-65]++; } else if(ch>=97 && ch<=122) { count[ch-97]++; } } return count; } } ...

Write a java program to count frequency of each char using Array :- import java.util.Scanner; class CharFreq{ static Scanner sc=new Scanner(System.in); public static void main(String[] args) { System.out.println("Enter a String : "); String str=sc.nextLine(); int fr[]=new int[26]; for(int i=0;i<str.length();i++) { if(str.charAt(i)>=65 && str.charAt(i)<=90) { fr[str.charAt(i)-65]++; } else if(str.charAt(i)>=97 && str.charAt(i)<=122) { fr[str.charAt(i)-97]++; } } for(int i=0;i<26;i++) { if(fr[i]>0) System.out.println((char)(i+65)+" | "+fr[i]); } } }

Write a java program to check and display frequency of each element :-- import java.util.Scanner; public class FrequencyElements { static Scanner sc=new Scanner(System.in); public static void main(String[] args) { int arr[]=inputArray(); int [] fr = new int [arr.length];          int visited = -1;         for(int i = 0; i < arr.length; i++){              int count = 1;              for(int j = i+1; j < arr.length; j++){                  if(arr[i] == arr[j]){                      count++;                      //To avoid counting same element again                      fr[j] = visited;            ...

Write a java program to find Nth smallest number without sorting :- import java.util.Scanner; public class NthLeastNumber { static Scanner sc=new Scanner(System.in); public static void main(String[] args) { int arr[]=inputArray(); System.out.println("Enter which smallest element you want :"); int n=sc.nextInt(); int sm=nThsmallest(arr,n); System.out.println(n+" biggest is "+sm); } static int nThsmallest(int[] ar,int n) { for(int i=0;i<ar.length;i++) { int count=0; for(int j=0;j<ar.length;j++) { if(ar[j]<ar[i]) count++; } if(count==n-1) return ar[i]; } return 0; } static int[] inputArray() { Scanner sc=new Scanner(System.in); System.out.println("Enter Size of Array : "); int n=sc.nextInt(); int count=0; int arr[]=new int[n]; System.out.println("enter value in array : "); for (int i=0; i<n; i++) { arr[i]=sc.nextInt(); } return arr; ...

Write a java program to Define a method to Display pair of elements which sum is Equal to n import java.util.Scanner; public class PairInArray { static Scanner sc=new Scanner(System.in); public static void main(String[] args) { System.out.println("Enter Length of Array : "); int n=sc.nextInt(); int arr[]= new int[n];                 System.out.println("enter value in array : "); for (int i=0; i<n; i++) { arr[i]=sc.nextInt(); } System.out.println("\nEnter  a number you check pair : "); int pair=sc.nextInt(); for (int i = 0; i < arr.length; i++) { for (int j = i+1; j < arr.length; j++) { if(pair==arr[i]+arr[j]) System.out.println(i+"  "+j); } } } }

Write a program to union two arrays import java.util.Scanner; import java.util.Arrays; public class UnionTwoArray { public static void main(String[] args) { System.out.println("For First Array : "); int[] arr1=inputArray(); System.out.println("For Second Array : "); int[] arr2=inputArray(); int[] arr3=mergeSort(arr1, arr2); int []arr4=removeDuplicates(arr3); displayArray(arr4); } static int[] inputArray() { Scanner sc=new Scanner(System.in); System.out.println("Enter Size of Array : "); int n=sc.nextInt(); int count=0; int arr[]=new int[n]; System.out.println("enter value in array : "); for (int i=0; i<n; i++) { arr[i]=sc.nextInt(); } return arr; } static int[] mergeSort(int a[],int b[]) { int c[]=new int[a.length+b.length]; int i=0,j=0,k=0; while(i<a.length && j<a.length) { if(a[i]<b[j] || a[i]==b[j]) { c[k++...