如何打印二维数组中元素的总和？

Question

Here is what I currently have:

    final int[][] myArray = 
        {
              { 1, 2, 5, 4 },
              { 4, 3, 2, 1 },
              { 5, 6, 7, 8 },
              { 8, 7, 6, 5 },
        };

            PrintArray(myArray);
            Analysis(myArray);
}

public static void Analysis(int[][] myArray) 
{

    for (int i = 0; i < myArray.length; i++)
    {
        int sum = sum + myArray[i];
    }
    System.out.println(sum);


}

public static void PrintArray(final int[][] myArray) 
{
    for (int i = 0; i < myArray.length; i++) 
    {
        for (int j = 0; j < myArray[i].length; j++) 
        {
            System.out.print(myArray[i][j] + " ");
        }
        System.out.println();
    }

And it says, "The operator + is undefined for the argument type(s) int, int[]" at the part with the sum. I am not sure why this would be.

Answer 1

I would use for-each loops and you need to declare sum before the loop (so it is visible). And the Java naming conventions would suggest starting with a lower case letter (your method looks like a class).

public static void Analysis(int[][] myArray) {
    int sum = 0;
    for (int[] arr : myArray) {
        for (int val : arr) {
            sum += val;
        }
    }
    System.out.println(sum);
}

Answer 2

It is a TWO dimensional array. How exactly are you expecting to access it using one indexer?

You can try this:

public static void Analysis(int[][] myArray) 
{
    int sum=0; //sum must be initiated BEFORE
    for (int i = 0; i < myArray.length; i++)
    {
        for(int j=0;j<myArray[i].length;j++)
            sum += myArray[i][j];
    }
    System.out.println(sum);
}

Answer 3

Your array has two dimensions! Thus you need two loops iterating both of those dimensions!

for (int i.... 
   for (int j=0; j<array[i].length ; j++)  
     sum += array [i] [j] ;

You know: very much the same way that you already wrote down your code that prints the array! There is no difference between accessing the array cell for printing.... or for summing them up!

Answer 4

Your "myArray" is a two dimensions, you need two loop for it's operation, like this:

public static void Analysis(int[][] myArray) 

{

for (int i = 0; i < myArray.length; i++)
{
    int sum = sum + myArray[i];
}
System.out.println(sum);

}

And if i'm not mistaking, your static int[][] myArray is in the main function(?) i suggest you final int[][] myArray

Answer 5

public static void Analysis(int[][] myArray){
   int sum=0;
   for (int i = 0; i < myArray.length; i++){
      for(int j=0; j< myArray[i].length;j++){
          sum += myArray[i][j];
      }
   }
   System.out.println(sum);
}