1. Switch elements
Example Suppose A = 3 and B = 4, and suppose that we want to
switch these values.
First attempt
A = B ‘First statement
B = A ‘Second statement
This does not work.
A B
At the beginning 3 4
After the first statement 4 4
After the second statement 4 4

2. The problem is that the value of A is lost
The problem is that the value of A is lost. The solution is to save this value before switching.
Second attempt Temp = A ‘First statement
A = B ‘Second statement
B = Temp ‘Third statement
A B Temp
At the beginning 3 4 undefined
After the first statement 3 4 3
After the second statement 4 4 3
After the third statement 4 3 4

3. After finding the position of the largest element in the array, switch this element with the last element in the array.