please can you help to identify those errors

[Nicholas Dintshi]

hi,from this code i do encounter some erros

class Array06
{
public static void main(String [] args)
{
int[][] arrayOfArray = new int[][];

int[] array1 = {10,20,30,40,50};
int[] array2 = {100,200,300};
int[] array3 = {5,10,15,20};

arrayOfArray[0] = array1;
arrayOfArray[1] = array2;
arrayOfArray[2] = array3;

int total = 0,noOfElements=0;

for(int i = 0;i<arrayOfArray.length;i++)
{
for(int j = 0;j<arrayOfArray[i].length;i++)
{
total += arrayOfArray[i][j];
noOfElements++
}
}

System.out.println("Total is:" + total);
System.out.println("Average:" + total/noOfElements);
}
}

[fred rosenberger]

What are the errors? does it compile? does it run?

[shilpa deshpande]

There are two compile time errors.

1) Java needs all the dimensions of the array to be definite other than the last dimension. For example here, int[][] arrayOfArray = new int[3][];
will work beautifully.

2) There is a semicolon missing on line # 22.

One runtime error happens because in the loop on line # 19, instead of counter j, counter i is incremented which results in throwing the ArrayIndexOutOfBoundsException.

Tip: never copy the for loops, it takes hours to debug such small things.

The updated code looks like this.

 class Array06
{
public static void main(String [] args)
{
int[][] arrayOfArray = new int[3][];
 
int[] array1 = {10,20,30,40,50};
int[] array2 = {100,200,300};
int[] array3 = {5,10,15,20};
 
arrayOfArray[0] = array1;
arrayOfArray[1] = array2;
arrayOfArray[2] = array3;
 
int total = 0,noOfElements=0;
 
for(int i = 0;i<arrayOfArray.length;i++)
{
for(int j = 0;j<arrayOfArray[i].length;j++)
{
total += arrayOfArray[i][j];
noOfElements++;
}
}
 
System.out.println("Total is:" + total);
System.out.println("Average:" + total/noOfElements);
}
}   

Hope it helps

[Anubhav Anand]

Nicholas Dintshi and Shilpa Deshpande,
Welcome to JavaRanch.

Nicholas please use code tags and other UBB tags as required. They make the post much more readable.

Hope you both have good time here. Good Luck..!!