var d1 = 8 + 2 //d1 is 10
var d2 = 8 - 2 //d2 is 6
var d3 = 8 * 2 //d3 is 16
var d4 = 8 / 2 //d4 is 4
var d5 = 5 % 2 //d5 is 1
var d6 = -5 % 2 //d6 is -1
var d7 = 1
d7++ //d7 is 2
d7-- //d7 is 1
d7, d8 := d7+1, d7 //d8 is 1, d7 is 2
d7, d9 := d7+1, d7+1 //d9 is 3, d7 is 3
fmt.Println("d8 =", d8)
fmt.Println("d9 =", d9)