>[success] ## 1）赋值基本案例 有两个变量，a和b，要求将其进行交换，最终打印结果 ``` package main import "fmt" func main() { var age = 18 var sum = 20 fmt.Printf("交换前\nage = %v\nsum = %v\n",age,sum) t := age age = sum sum = t fmt.Printf("交换后\nt = %v\nage = %v\nsum = %v\n",t,age,sum) } ``` <br> >[info] **运行结果：** `交换前` `age = 18` `sum = 20` `交换后` `t = 18` `age = 20` `sum = 18` <br> <br> >[success] ## 2）+=的使用案例 ``` package main import "fmt" func main() { var s = 10 s += 20 fmt.Printf("s = %v",s) } ``` <br> >[info] **运行结果：** `s = 30`