What will be the output of the following program?        int x = 20;        int y = 10;        double z = x++ - y * 7 / --y + x * 10;        System.out.println(z);

The output of the program will be calculated as follows:

1. First, the operations inside the parentheses are performed. However, there are no parentheses in this expression.

2. Next, the unary operations are performed. In this case, we have x++ and --y. The x++ operation will increment the value of x by 1, but it will return the original value of x before the increment. The --y operation will decrement the value of y by 1 and return the new value. So after these operations, x will be 21, y will be 9, and the expression will look like this: 20 - 10 * 7 / 9 + 21 * 10.

3. Then, the multiplication and division operations are performed from left to right. So 10 * 7 is 70 and 70 / 9 is approximately 7.78 (since z is a double, the division operation will return a double). The expression now looks like this: 20 - 7.78 + 21 * 10.

4. Finally, the addition and subtraction operations are performed from left to right. So 20 - 7.78 is approximately 12.22 and 12.22 + 21 * 10 is 222.22.

So the output of the program will be 222.22.