This is addition: 9
This is subtraction: 1
This is multiplication: 20
This is division: 1.25
This is modulus: 1
This is pre-increment on 5: 6 which increments and then displays the result which is 6
This is post-increment on 5: 5 which displays the value of the variable and then increments to 6
This is pre-decrement on 5: 4 which decrements and then displays the result which is 4
This is post-decrement on 5: 5 which displays the value of the variable and then decrements to 4