I tried to find the sum of any array by using the for loop but the i part ended up being the deadcode unreachable. I don't understand why?

 public static int sum(int[] data) {
            int sum = 0;
            int i;
            for (i = 0; i < data.length; i  ) { //the i    is the deadcode
                    sum  = data [i];
                    return sum;
                }
            return 0; //to be completed
        }

CodePudding user response：

The i is dead code because it can never be reached. It can never be reached because you have a return statement within the loop. Therefore, it will never execute the increment portion of the for-loop. Move the return sum; outside the loop (replacing the return 0;).

public static int sum(int[] data) {
  int sum = 0;
  for (int i = 0; i < data.length; i  ) {
    sum  = data [i];
  }
  return sum;
}

CodePudding user response：

Don't return something inside for loop, because return ends the cycle of whole function.

Instead, do something like this:

    public static int sum(int[] data) {
        int sum = 0;
        for (int i = 0; i < data.length; i  ) {
            sum  = data[i];
        }
        return sum;
    }

CodePudding user response：

You are always returning after the first iteration so you do not sum anything besides the first element. You should do it like this :

    public static int sum(int[] data) {
        int sum = 0;
        for (int i = 0; i < data.length; i  )
        { 
                sum  = data [i];

         }
        return sum;
    }

public static void main(String[] args)
{
    int data[] = {1,2,3,4,5}; 
    int sum = sum(data);
    
    System.out.println(sum);
}

}