Computer programming Code exercises [1D Array]

Transcription

1 Computer programming Code exercises [1D Array] Ex#1: //Program to read five numbers, from user. public class ArrayInput public static void main(string[] args) Scanner input = new Scanner(System.in); double[] mylist = new double[ 5 ]; System.out.print("Enter " + mylist.length + " values: "); for (int i = 0; i < mylist.length; i++) mylist[i] = input.nextdouble(); for (int i = 0; i < mylist.length; i++) System.out.println("index[" + i + "] has " + mylist[i]); Ex#2: //Program to sum given numbers public class ArraySum public static void main(string[] args) int[] array = 4, 1, 4, 7, 4, 1, 5, 9, 0, 10 ; int total = 0; for (int count = 0; count < array.length; count++) total += array[ count ]; System.out.printf("Total of array elements: %d\n", total);

2 Ex#3: //Program to sum input numbers, then print the numbers in reverse order. public class ArrayReverse public static void main(string[] args) int[] items = new int[5]; //declare an array item of 5 elements int sum= 0; System.out.println("Enter five integers:"); for (int counter = 0; counter < items.length; counter++) items[counter] = console.nextint(); sum = sum + items[counter]; System.out.println("The sum of the numbers = "+ sum); System.out.print("The numbers in the reverse order are: "); //print the numbers in the reverse order for (int counter = items.length - 1; counter >= 0; counter--) System.out.print(items[counter] + " "); //end main //end class

3 Ex#4 // This remove a specific element from an array. The array list is: 25, 14, 56, 15, 36, 56, 77, 18, 29, 49, removeindex = 1 public class RemoveIndex public static void main(string[] args) int[] my_array=25, 14, 56, 15, 36, 56, 77, 18, 29, 49; System.out.println("Original Array : "+Arrays.toString(my_array)); int removeindex = 1; for(int i = removeindex; i < my_array.length -1; i++) my_array[i] = my_array[i + 1]; Ex#5 // This program find the maximum element in array. public class ArrayMax public static void main(string[] args) int[] my_array = 25, 14, 56, 15, 36, 56, 77, 18, 29, 49; System.out.println(" Maximum value for the above array = " + max(my_array)); public static int max(int my_array[]) int max = my_array[0]; int len = my_array.length; for (int i = 1; i < len - 1; i++) if (my_array[i] > max) max = my_array[i]; return max; //end class

4 Ex#6 // This program illustrates how to use a sequential search public class TestSeqSearch public static void main(string[] args) int[] intlist = new int[10]; int number, index; System.out.println("Enter " + intlist.length + " integers."); for (index = 0; index < intlist.length; index++) intlist[index] = console.nextint(); System.out.print("Enter the number " + "to be searched: "); number = console.nextint(); int c; for (c = 0; c < intlist.length; c++) if (intlist [c] == number) // Searching element is present System.out.println(number + " is present at location " + (c + 1) + "."); break; if (c == intlist.length) /* Element to search isn't present */ System.out.println(number + " isn't present in array.");

5 Ex#7 // This program to find the number of even and odd integers in a given array of integers public static void main(string[] args) int[] array_nums = 5, 7, 2, 4, 9; System.out.println("Original Array: "+Arrays.toString(array_nums)); int ctr = 0; for(int i = 0; i < array_nums.length; i++) if(array_nums[i] % 2 == 0) ctr++; System.out.println("Number of even numbers : "+ctr); System.out.println("Number of odd numbers : "+(array_nums.length-ctr)); Ex#8 // This program to Sort the Array in Ascending Order int n, temp=0; Scanner s = new Scanner(System.in); System.out.print("Enter no. of elements you want in array:"); n = s.nextint(); int a[] = new int[n]; System.out.println("Enter all the elements:"); for(int i = 0; i < n; i++) a[i] = s.nextint(); for(int i = 0; i < n; i++) for(int j = i + 1; j < n; j++) if(a[i] > a[j]) temp = a[i]; a[i] = a[j]; a[j] = temp;

6 System.out.print("Ascending Order:"); for(int i = 0; i < n -1; i++) System.out.print(a[i] + ","); System.out.print(a[n -1]); Ex#8 // This program illustrates how arrays are passed as actual parameters in a method call public static void main(string[] args) final int ARRAY_SIZE = 5; int[] lista = new int[array_size]; int[] listb = new int[array_size]; System.out.print("listA elements: "); //output the elements of lista using the method printarray printarray(lista,lista.length); System.out.print("Enter " + lista.length+ " integers: "); //input data into lista using the method fillarray fillarray(lista,lista.length); System.out.print("After filling "+ "lista, the elements are:"+ "\n "); //output the elements of lista printarray(lista,lista.length); //find and output the sum of the elements of lista System.out.println("The sum of the "+ "elements of lista is: "+ sumarray(lista,lista.length));

7 System.out.println("The position of "+ "the largest element in "+ "lista is: "+indexlargestelement(lista, lista.length)); //find and output the largest element in lista System.out.println("The largest element "+ "in lista is: "+ lista[indexlargestelement(lista, lista.length)]); //Line 20 //copy the elements of lista into listb using the method copyarray copyarray(lista, 0, listb, 0,listA.length); System.out.print("After copying the "+ "elements of lista into listb\n"+ "listb elements are: "); //output the elements of listb printarray(listb,listb.length); public static void fillarray(int[] list, int numofelements) for (int index = 0; index < numofelements; index++) list[index] = console.nextint(); public static void printarray(int[] list, int numofelements) for (int index = 0; index < numofelements; index++) System.out.print(list[index] + " "); public static int sumarray(int[] list, int numofelements) int sum = 0; for (int index = 0; index < numofelements; index++) sum = sum + list[index]; return sum;

8 public static int indexlargestelement(int[] list, int numofelements) int maxindex = 0; //Assume first element is the largest for (int index = 1; index < numofelements; index++) if (list[maxindex] < list[index]) maxindex = index; return maxindex; public static void copyarray(int[] list1, int src, int[] list2, int tar, int numofelements) for (int index = src; index < src + numofelements; index++) list2[index] = list1[tar]; tar++; //end class Ex#9 // This program return the index of the smallest value in input array public static void main(string[] args) int [] a = new int[10]; System.out.println("Enter values: "); for( int i = 0 ; i < 10 ; i++) a[i] = console.nextint(); System.out.println("The index of the first smallest value is :" + smallestindex(a,a.length)); public static int smallestindex(int[] arr, int size) int smallest = 0; int temp = arr[0];

9 for( int i = 0 ; i < size ; i++) if (arr[i] < temp) smallest = i; temp = arr[i]; return smallest; Ex#10 // This program return the index of the largest value in input array public static void main(string[] args) final int size; System.out.print("Please Enter the size of the array: "); size = console.nextint(); int [] a = new int[size]; System.out.print("Enter values: "); for( int i = 0 ; i < size ; i++) a[i] = console.nextint(); System.out.println("The index of the last Largest Index value is :" + lastlargestindex(a,a.length)); public static int lastlargestindex(int[] arr, int size) int largest = 0; int temp = arr[0]; for( int i = 0 ; i < size ; i++) if (arr[i] >= temp) largest = i; temp = arr[i]; return largest;