Question

1) use java to print the sum of the list (any #s) using keyboard, also using a while loop and for-loop and do-loop. ( 3 separate programs ).

Answer 1

import java.util.*;

public class Main

{

public static void main(String[] args)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter array size");

int n = sc.nextInt();

int arr[] = new int[n];

int i;

System.out.println("Enter elements of Array");

for(i=0;i<n;i++)

arr[i]= sc.nextInt();

int for_loop_sum = 0;

for(i=0;i<n;i++)

for_loop_sum+=arr[i];

System.out.println("Sum using for loop:" + for_loop_sum);

int while_loop_sum = 0;

i=0;

while(i<n)

{

while_loop_sum+=arr[i];

i++;

}

System.out.println("Sum using while loop:" + while_loop_sum);

i = 0;

int do_while_sum = 0;

do{

do_while_sum+=arr[i];

i++;

}while(i<n);

System.out.println("Sum using do_while loop:" + do_while_sum);

}

}