Delete element from end in array.

Here we initialize last index with 0(zero) of array.

import java.util.Scanner;
 
class del1{
                    public static void main(String[] args) {
                                        Scanner sc = new Scanner(System.in);
                                        System.out.println(“\n Enter the size of array “);
                                        intn,g,i,cnt=0,lastIndex=0;
                                        n=sc.nextInt();
                                        int array[]=new int[n];
                                        for (i=0; i<n;i++ ) {
                                                            System.out.println(“enter element : \t”);
                                                            array[i] = sc.nextInt();
                                        }
                                                            for (i=0;i<n ; i++) {
                                                                                if (array[i]>0 || array[i]<0) {
                                                                                                    cnt++;
                                                                                }
                                                            }
                                                            System.out.println(“\n before deletion array “);
                                                            for (i=0;i<n ;i++ ) {
                                                                                System.out.println(“\t”+array[i]);
                                                            }
                                                            lastIndex=cnt-1;
                                                            array[lastIndex]=0;
 
                                                            System.out.println(“\n after deletion array “);
                                                            for (i=0;i<cnt-1 ;i++ ) {
                                                                                System.out.println(“\t”+array[i]);
                                                            }
                    }
}
output

Delete element from start in array.

Here we shift every data elements one step towards first index. So last index initialize with 0(zero).

import java.util.Scanner;
 
class del2{
                    public static void main(String[] args) {
                                        Scanner sc = new Scanner(System.in);
                                        System.out.println(“\n Enter the size of array “);
                                        intn,g,i,cnt=0,lastIndex=0,p=0,q=0,loop=0;
                                        n=sc.nextInt();
                                        int array[]=new int[n];
                                        for (i=0; i<n;i++ ) {
                                                            System.out.println(“enter element : \t”);
                                                            array[i] = sc.nextInt();
                                        }
                                        System.out.println(“\n before deletion array “);
                                                            for (i=0;i<n ;i++ ) {
                                                                                System.out.println(“\t”+array[i]);
                                                            }
                                                            for (i=0;i<n ; i++) {
                                                                                if (array[i]>0 || array[i]<0) {
                                                                                                    cnt = cnt+1;
                                                                                }
                                                            }
                                                            lastIndex=cnt-1;
                                                            loop = cnt-1;
                                                            q++;
                                                            for (i=0;i<loop ;i++ ) {
                                                                                array[p]=array[q];
                                                                                p++;
                                                                                q++;
                                                            }
                                                            array[lastIndex]=0;
                                                            System.out.println(“\n after deletion array “);
                                                            for (i=0;i<n ;i++ ) {
                                                                                System.out.println(“\t”+array[i]);
                                                            }
 
                    }
}
output

Delete element from array, from given user’s position.

import java.util.Scanner;
 
class del4{
                    public static void main(String[] args) {
                                        Scanner sc = new Scanner(System.in);
                                        intpos,i,n=0,cnt=0; // n = array-size, pos = user array’s delete position
                                        System.out.println(“\n enter size of array “);
                                        n = sc.nextInt();
                                        int array[] = new int[n];
                                        for (i=0;i<n ;i++ ) {
                                                            System.out.println(” enter element \t”);
                                                            array[i]=sc.nextInt();
                                       
                                        }
                                       
                                        System.out.println(“\n enter position to delete “);
                                        pos = sc.nextInt();
                                        for (i=0;i<n;i++ ) {
                                                            if (array[i]<0 || array[i]>0) {
                                                                                cnt=cnt+1;
                                                            }
                                        }
                                        System.out.println(” before deletion arry : “);
                                       
                                        // printing array elements
                                        for (i=0;i<n;i++ ) {
                                                            System.out.println(“\t”+array[i]);
                                        }
                                       
                                        int p=0,q=0;
                                        p=pos;q=pos+1;
                                        for (i=pos;i<cnt-1;i++ ) {
                                                            array[p]=array[q];
                                                            p++;
                                                            q++;
                                        }
                                        p=cnt-1;
                                        array[p]=0;
                                        System.out.println(” after delete array will look like “);
                                       
                                        // printing array elements
                                        for (i=0;i<n;i++ ) {
                                                            System.out.println(“\t”+array[i]);
                                        }
 
                    }
}
output

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