Question

we are looking at the "changeSpecificIndex" method.

i was able to replace the value of that specific index, but im stumped at adding a value to a specific index AND shifting the values after it to the next index.

Here is my code

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import java.util.Scanner;
import java.util.Arrays;

public class ArrayMenu{
static int count;
static Scanner kb = new Scanner(System.in);
  
  
  
  
public static void main(){
int item=0;
int[] numArray=new int[100];
count=0;
  
  
while (item !=8){
menu();
item = kb.nextInt();
if (item==1)
initializeArray(numArray);
else if (item==2)
printArray(numArray);
else if (item==3)
addToEnd(numArray);
else if (item == 4)
changeSpecificIndex(numArray);
/* else if (item == 5)
removeElement(numArray);
*/ else if (item == 6)
minMaxSumAvg(numArray);
/* else if (item == 7)
Search(numArray);
*/
}
  
System.out.println("Goodby!");
  
}

public static void menu(){
System.out.println("1. Initialize Array");
System.out.println("2. Display Array");
System.out.println("3. Add element to the end");
System.out.println("4. Add an element at a specific index");
System.out.println("5. Remove an element at specific index");
System.out.println("6. Show min, max, sum and average");
System.out.println("7. Search");
System.out.println("8. Exit");
System.out.println("________________________________________");
}
  
public static void initializeArray(int[] arr){
count=0;
int num;
System.out.print("Enter integer values to fill the array -value to stop: ");
do
{
num = kb.nextInt();
if (num >=0)
{
arr[count]=num;
count++;
}
} while (num > 0);
  
}
public static void printArray(int[] arr){
for (int i=0; i< count; i++)
System.out.print(arr[i]+" ");
System.out.println();
}
  
public static void addToEnd(int[] arr){
System.out.print("Enter number to add: ");
int num = kb.nextInt();
arr[count] = num;
count++;
System.out.println();

}
  
public static void minMaxSumAvg(int[] arr){
  
double max = arr[0];
double min = arr[0];
double sum = 0;
double avg = 0;
  
for(int i = 1; i < count; i++){
  
int numby = arr[i];
  
if(numby > max){
max = numby;

}
  
if(numby < min){
min = numby;
}
  
sum = sum + arr[i];
}
  
avg = sum / count;
  
  
System.out.println("Sum is: " + sum);
System.out.println("Average is: " + avg);
System.out.println("Max is: " + max);
System.out.println("Min is: " + min);

}
  
  
public static void changeSpecificIndex(int[] arr){
int arrIndex;
int newValue;
  
System.out.println("What index would you like to change: ");
arrIndex = kb.nextInt() - 1;
System.out.println("Assign new value: ");
newValue = kb.nextInt();
  
arr[arrIndex] = newValue;
  
System.out.println("The value of Index " + (arrIndex + 1) + " has been changed to " + newValue);

  

  
}
  
  
  
  
  
  
}

Answer 1

import java.util.Scanner;
import java.util.Arrays;

public class ArrayMenu {
        static int count;
        static Scanner kb = new Scanner(System.in);

        public static void main(String args[]) {
                int item = 0;
                int[] numArray = new int[100];
                count = 0;

                while (item != 8) {
                        menu();
                        item = kb.nextInt();
                        if (item == 1)
                                initializeArray(numArray);
                        else if (item == 2)
                                printArray(numArray);
                        else if (item == 3)
                                addToEnd(numArray);
                        else if (item == 4)
                                changeSpecificIndex(numArray);
                        /*
                         * else if (item == 5) removeElement(numArray);
                         */ else if (item == 6)
                                minMaxSumAvg(numArray);
                        /*
                         * else if (item == 7) Search(numArray);
                         */
                }

                System.out.println("Goodby!");

        }

        public static void menu() {
                System.out.println("1. Initialize Array");
                System.out.println("2. Display Array");
                System.out.println("3. Add element to the end");
                System.out.println("4. Add an element at a specific index");
                System.out.println("5. Remove an element at specific index");
                System.out.println("6. Show min, max, sum and average");
                System.out.println("7. Search");
                System.out.println("8. Exit");
                System.out.println("________________________________________");
        }

        public static void initializeArray(int[] arr) {
                count = 0;
                int num;
                System.out.print("Enter integer values to fill the array -value to stop: ");
                do {
                        num = kb.nextInt();
                        if (num >= 0) {
                                arr[count] = num;
                                count++;
                        }
                } while (num > 0);

        }

        public static void printArray(int[] arr) {
                for (int i = 0; i < count; i++)
                        System.out.print(arr[i] + " ");
                System.out.println();
        }

        public static void addToEnd(int[] arr) {
                System.out.print("Enter number to add: ");
                int num = kb.nextInt();
                arr[count] = num;
                count++;
                System.out.println();

        }

        public static void minMaxSumAvg(int[] arr) {

                double max = arr[0];
                double min = arr[0];
                double sum = 0;
                double avg = 0;

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

                        int numby = arr[i];

                        if (numby > max) {
                                max = numby;

                        }

                        if (numby < min) {
                                min = numby;
                        }

                        sum = sum + arr[i];
                }

                avg = sum / count;

                System.out.println("Sum is: " + sum);
                System.out.println("Average is: " + avg);
                System.out.println("Max is: " + max);
                System.out.println("Min is: " + min);

        }

        public static void changeSpecificIndex(int[] arr) {
                int arrIndex;
                int newValue;

                System.out.println("What index would you like to change: ");
                arrIndex = kb.nextInt() - 1;
                System.out.println("Assign new value: ");
                newValue = kb.nextInt();
                
                if(arrIndex > count) {
                        System.out.println("Invalid Index entered. Valid indices are from 0 to " + count);
                } else {
                        
                        for(int i=count; i>arrIndex; i--) {
                                arr[i] = arr[i-1];
                        }
                        arr[arrIndex] = newValue;

                        System.out.println("The value of Index " + (arrIndex ) + 
                                        " has been changed to " + newValue);
                        
                        count++;
                }


        }

}

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