Question

The following program segment swaps the first element and the second element of the given array without using the third variable. Fill in the blanks with appropriate java statements: 

    void swap()
    { int x/ | = {4, 8, 19,24, 15}:
    (1) ______
    (2) ______
    x/0 = x/0]/x/1];
    System.out.println(x/0}+" "+x/I]): }

Answer 1

(1) x[0] = x[0] * x[1];
(2) x[1] = x[0] / x[1];

The goal is to swap the first element x[0] (value 4) and the second element x[1] (value 8) without a temporary variable. 

• Step 1: Multiply the two numbers and store the result in the first position: x[0] = 4 × 8 = 32.
• Step 2: Divide the new x[0] by the original x[1] to get the original x[0] and store it in x [1]: x[x] = 32/8 = 4.
• Step 3: (Already in image): Divide the total product by the new x[1] to get the original x[1] and store it in x[0] = 32/4 = 8.