Java: Given an array of integers, find the sum of its elements.

Question

Problem:

I am a novice Java programmer who started learning to program in Java just a few weeks ago. I got an assignment from my tutor in which I have to write a program that prints the sum of the elements of a given array. The output of the program should be as follows:

1 + 2 + 3 + 4 + 5 + 6 = 21

I tried writing the following program, but it gives some strange errors:

public class array_sum{

     public static void main(String []args){
       int[] array = {1,2,3,4,5,6};
       for(int i = 0; i < array.length; i++)
       {
           sum = array[i] + array[i+1];
       }
       
       for(int i = 0; i < array.length; i++)
       {
           System.out.print(array[i]);
       }
       System.out.println(" = " + sum);
     }
}

I am allowed to take help from the Internet so asking for help from you guys. Can anybody please provide me with a solution? Thanks!

Answer 1

Hello Code Learner! I appreciate your attempt to the assignment and you have almost done the task. All you need to do is to change the code a little, and you will have the desired output. Read the comments in following code to better understand the solution:

public class array_sum{

     public static void main(String []args){
       int[] array = {1,2,3,4,5,6};   //array of integers
       
       int sum = 0;                  //an integer variable to store the sum of elements
       
       for(int i = 0; i < array.length; i++) //looping through the array
       {
           sum += array[i];  //adding the new element of the array in previous value of sum and assigning it back to sum.
       }
      
       
       for(int i = 0; i < array.length; i++)  //again looping through the array to print its elements
       {
           System.out.print(array[i]);  //printing each element of array
         
           if(i < array.length - 1)   //if true "plus" is printed. If false, else block is executed
           {
               System.out.print(" + ");
           }
           else
           {
               break;   //if i = array.length, the loop breaks
           }
       }
       
       System.out.println(" = " + sum);  //after printing the elements of the array, printing the sum of elements on the screen
     }
}