CIS 3020 Part 6

Ordering of Statements in Methods

Consider the following two methods:

public void count1(int x) { if (X <= 0) { System.out.println(x); } else { System.out.println(x); count1(x-1); } }

public void count2(int x) { if (X <= 0) { System.out.println(x); } else { count2(x-1); System.out.println(x); } }

• Do they calculate the same values?
• Do they do the calculations in the same way?
• Do they print the same results?

Execution

Executing with x=4:

Entering count1(4) 4 Entering count1(3) 3 Entering count1(2) 2 Entering count1(1) 1 Entering count1(0) 0 Exiting count1(0) Exiting count1(1) Exiting count1(2) Exiting count1(3) Exiting count1(4)

Entering count2(4) Entering count2(3) Entering count2(2) Entering count2(1) Entering count2(0) 0 Exiting count2(0) 1 Exiting count2(1) 2 Exiting count2(2) 3 Exiting count2(3) 4 Exiting count2(4)