Question

Consider the following incomplete method that is intended to return an array that contains the contents of its first array parameter followed by the contents of its second array parameter.

public static int[] append(int[] a1, int[] a2)
{
int[] result = new int[ + ];
for (int j = 0; j < ; j++)
{
result[j] = a1[j];
}

for (int k = 0; k < ; k++)
{
result[ /* index */ ] = a2[k];
}
return result;
}

Which of the following expressions can be used to replace /* index */ so that append will work as intended?

a. J
b. k
c. k + a1.lenght -1
d. k + a1.lenght
e. k + a1.lenght +1

Answer 1

To replace /* index */ in the given code, we need to find the appropriate expression that will allow the append method to work as intended. The correct expression is k + a1.length.

Step-by-step explanation:

To replace /* index */ in the given code, we need to find the appropriate expression that will allow the append method to work as intended. Let's analyze the code to find clues. The for loop with the variable j is iterating over the first array, a1, and adding its elements to the result array. This means that the length of a1 is the size of the index where the second array, a2, should start adding elements.

Looking at the options provided, the expression k + a1.length allows us to correctly set the index for the a2 elements since k is the iterator variable for the second loop and a1.length represents the number of elements in the first array. Therefore, the correct expression to replace /* index */ is k + a1.length.