35. Number pattern 10.


1
121
12321
1234321
123454321
12345654321
1234567654321

import java.util.*;

class Pattern
{
public static void main(String[] args)
{
int i, j, k = 1, l, n;
Scanner sc = new Scanner(System.in);

System.out.println("Enter the number of levels of pattern");
n = sc.nextInt();

System.out.println("\nPattern is : \n");

for (i = 1; i <= n; i++)
{
l = i;

for (j = 1; j <= k; j++)
{
if (j >= i + 1)
{
System.out.print(--l);
}

else
{
System.out.print(j);
}
}

k = k + 2;
System.out.println(" ");
}
}
}

@java_codings

36. Star Pattern 1.
****
***
**
*

class StarPattern1
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = i; j <= 5; j++)

{

System.out.print("*");

}

System.out.println();
}
}
}

@java_codings

37. Star Pattern.
*
**
***
****
*****

class StarPattern2
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}
}
}

@java_codings

38. Star Pattern 3.

class StarPattern3
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{
for (int j = i; j <= 5; j++)

{
System.out.print("*");
}

System.out.println();
}

for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}

}
}

@java_codings

39. Star Pattern 4.


**
****
******
********
**********

class StarPattern4
{

public static void main(String arg[])
{

int num = 12;
int f = 2;
int g = num - 1;

for (int i = 1; i <= (num / 2); i++)
{

for (int j = 1; j <= num; j++)
{

if (j >= f && j <= g)
{

System.out.print(" ");

}
else
{

System.out.print("*");

}
}

f = f + 1;
g = g - 1;

System.out.println();
}
}
}

@java_codings

40. Star Pattern 5.

class StarPattern5
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}

for (int i = 1; i <= 5; i++)
{

for (int j = i; j <= 5; j++)

{
System.out.print("*");
}

System.out.println();
}
}
}

@java_codings

41. Triangle Pattern.

import java.io.*;

class Triangle
{
public static void main(String arg[])
{
InputStreamReader istream = new InputStreamReader(System.in);
BufferedReader read = new BufferedReader(istream);
System.out.println("Enter Triangle Size : ");
int num = 0;
try
{
num = Integer.parseInt(read.readLine());
}
catch (Exception Number)
{
System.out.println("Invalid Number!");
}

for (int i = 1; i <= num; i++)
{
for (int j = 1; j < num - (i - 1); j++)
{
System.out.print(" ");
}

for (int k = 1; k <= i; k++)
{
System.out.print("*");
for (int k1 = 1; k1 < k; k1 += k)
{

System.out.print("*");
}
}

System.out.println();
}
}
}

@java_codings

42. Add two Matrix.
import java.util.*;

class AddTwoMatrix
{
int m, n;
int first[][] = new int[m][n];
int second[][] = new int[m][n];

AddTwoMatrix(int[][] first, int[][] second, int m, int n)
{
this.first = first;
this.second = second;
this.m = m;
this.n = n;
}

public static void main(String[] args)
{
int m, n, c, d;

Scanner in = new Scanner(System.in);

System.out.println("Enter the number of rows and columns of matrix");
m = in.nextInt();
n = in.nextInt();

int first[][] = new int[m][n];
int second[][] = new int[m][n];

System.out.println("Enter the elements of first matrix");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
first[c][d] = in.nextInt();
}
}

System.out.println("Enter the elements of second matrix");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
second[c][d] = in.nextInt();
}
}

System.out.println("\nElements of First matrix is : ");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
System.out.print(first[c][d] + "\t");
}
System.out.println();
}

System.out.println("\nElements of Second matrix is : ");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
System.out.print(second[c][d] + "\t");
}
System.out.println();
}

AddTwoMatrix a = new AddTwoMatrix(first, second, m, n);
//call by reference
a.addmatrix(a); //Passing Object
}

//Function for Adding two matrix and storing in third matrix
public void addmatrix(AddTwoMatrix a)
{
int c, d;
int sum[][] = new int[a.m][a.n];

for (c = 0; c < a.m; c++)
{
for (d = 0; d < a.n; d++)
{
sum[c][d] = a.first[c][d] + a.second[c][d];
}
}

System.out.println("\nSum of the two matrices is : ");

for (c = 0; c < a.m; c++)
{
for (d = 0; d < a.n; d++)
{
System.out.print(sum[c][d] + "\t");
}
System.out.println();
}
}
}

@java_codings

43. Array of Arrays.

class ArrayOfArraysAnimalDemo
{
public static void main(String[] args)
{
String[][] animals = {{"DanaDog", "WallyDog", "JessieDog", "AlexisDog", "LuckyDog"}, {"BibsCat", "DoodleCat", "MillieCat", "SimonCat"}, {"ElyFish", "CloieFish", "GoldieFish", "OscarFish", "ZippyFish", "TedFish"}, {"RascalMule", "GeorgeMule", "GracieMule", "MontyMule", "BuckMule", "RosieMule"}};

for (int i = 0; i < animals.length; i++)
{
System.out.print(animals[i][0] + ": ");

for (int j = 1; j < animals[i].length; j++)
{
System.out.print(animals[i][j] + " ");
}

System.out.println();
}
}
}

@java_codings

44. Array operations.

class ArrayOperations
{
public static void main(String[] args)
{
double[] myList = {1.9, 2.9, 3.4, 3.5};

// Print all the array elements
for (int i = 0; i < myList.length; i++)
{
System.out.println(myList[i] + " ");
}
// Summing all elements
double total = 0;
for (int i = 0; i < myList.length; i++)
{
total += myList[i];
}

System.out.println("Total is " + total);

// Finding the largest element
double max = myList[0];
for (int i = 1; i < myList.length; i++)
{
if (myList[i] > max)
max = myList[i];
}

System.out.println("Max is " + max);
}
}

@java_codings

45. Array Sort.

import java.util.Arrays;

class ArraySort
{
// This program is the example of array sorting
public static void main(String[] args)
{
// TODO Auto-generated method stub
// initializing unsorted array
String iArr[] = {"Programming", "Hub", "Alice", "Wonder", "Land"};

// sorting array
Arrays.sort(iArr);

// let us print all the elements available in list
System.out.println("The sorted array is:");
for (int i = 0; i < iArr.length; i++)
{
System.out.println(iArr[i]);
}
}
}

@java_codings

46. Array Sum and Average.

import java.io.*;

class ArrayAverage
{
public static void main(String[] args)
{
//define an array
int[] numbers = new int[]{10, 20, 15, 25, 16, 60, 100};

int sum = 0;

for (int i = 0; i < numbers.length; i++)
{
sum = sum + numbers[i];
}

double average = sum / numbers.length;
System.out.println("Sum of array elements is : " + sum);
System.out.println("Average value of array elements is : " + average);
}
}

@java_codings

47. Basic Array.

import java.util.*;

class ArrayBasic
{
public static void main(String[] args)
{
int[] arr;
int size, i;

Scanner sc = new Scanner(System.in);

System.out.println("Enter size of array");
size = sc.nextInt();

arr = new int[size];

System.out.println("\nEnter array elements");
for (i = 0; i < size; i++)
{
arr[i] = sc.nextInt();
}

System.out.println("\nElements in the Array are : ");
for (i = 0; i < size; i++)
{
System.out.print(arr[i] + " ");
}
}
}

@java_codings

48. Create & Display Matrix.

import java.util.Scanner;

class Matrix_Create {

Scanner scan;
int matrix[][];
int row, column;

void create() {

scan = new Scanner(System.in);

System.out.println("Matrix Creation");

System.out.println("\nEnter number of rows :");
row = Integer.parseInt(scan.nextLine());

System.out.println("Enter number of columns :");
column = Integer.parseInt(scan.nextLine());

matrix = new int[row][column];
System.out.println("Enter the data :");

for(int i=0; i<row ; i++) {

for(int j=0; j
<column ; j++) {

matrix[i][j] =scan.nextInt();
}
}
}

void display() {

System.out.println("\nThe Matrix is :");

for(int i=0; i <row ; i++) {

for(int j=0; j <column ; j++) {

System.out.print("\t" + matrix[i][j]);
}
System.out.println();
}
}
}

class CreateAndDisplayMatrix {

public static void main(String
args[]) {

Matrix_Create obj=new Matrix_Create();

obj.create();
obj.display();
}
}

@java_codings

49. Display Array using for-each loop.

class DisplayArrayForEach
{
public static void main(String[] args)
{
double[] myList = {1.9, 2.9, 3.4, 3.5};

// Print all the array elements
for (double element : myList)
{
System.out.println(element);
}
}
}

@java_codings

50. Double Matrix.

import java.util.*;
import java.text.DecimalFormat;

class DoubleMatrix
{
public static void main(String[] args)
{
double[][] a;
double[] s;
int row, col, k = 0, i, j;
double sum = 0.0;

DecimalFormat f = new DecimalFormat("##.####");
Scanner sc = new Scanner(System.in);

System.out.println("Enter size of row and column");
row = sc.nextInt();
col = sc.nextInt();

a = new double[row][col];
s = new double[col];

System.out.println("Enter elements of matrix");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
a[i][j] = sc.nextDouble();
}
}

System.out.println("Double Matrix is : ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
System.out.print(" " + a[i][j]);
}
System.out.println();
}

//sum of the elements of double matrix

for (i = 0; i < col; i++)
{
for (j = 0; j < row; j++)
{
sum = sum + a[j][i];
}
s[k] = sum;
k++;
sum = 0;
}

for (i = 0; i < col; i++)
{
System.out.println("Sum of Column " + (i + 1) + " is : " + f.format(s[i]));
}
}
}

@java_codings

51. Example to Pass Arrays to function.

import java.util.*;
class PassingArraystoFunction
{
public static void main(String[] args)
{
int[] a;
int size;

Scanner sc = new Scanner(System.in);

System.out.println("Enter size of array");
size = sc.nextInt();

a = new int[size];

System.out.println("Enter elements in the array");
for(int i = 0 ;i < size; i++)
{
a[i] = sc.nextInt();
}

System.out.println("The Elements of the array are : ");
for(int i = 0 ;i < size; i++)
{
System.out.print(a[i] + " ");
}

//Passing array to the function
addElements(a, size);
}

public static void addElements(int[] a , int size)
{
int sum = 0;

for(int i = 0; i < size; i++)
{
sum += a[i];
}

System.out.println("\nSum of the elements of arrays is : "+sum);
}
}

@java_codings