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package main
import "fmt"
// function add
func add(a,b int) int {
return a + b
}
// 1
func testFunc1() {
// function "add" to var "f1" // then "f1" is a function f1 := add // type of f1 = func(int int) int fmt.Printf("type of f1 = %T\n",f1) // call function "f1" // params are 2 and 5 sum := f1(2,5) // sum = 7 fmt.Printf("sum = %d\n",sum)
}
// 2
func testFunc2() {
// anonymous function to var "f1",then "f1" is a function f1 := func(a,b int) int { return a + b } // type of f1 = function(int,int) int fmt.Printf("type of f1 = %T\n",f1) // call function f1,params are 2 and 5 sum := f1(2,sum)
}
// 3
func testFunc3() {
var i = 0
// the statement after "defer" will be pushed into stack first // so the value of var "i" will be "0" // defer i = 0 defer fmt.Printf("defer i = %d\n",i) i = 100 // i = 100 fmt.Printf("i = %d\n",i) return
}
// 4
func testFunc4() {
var i = 0
// the anonymous function after "defer" will be pushed into stack first // but at this time,the statement in function will not be pushed into stack // so at this time the value of var "i" is not specific // the value of var // at the end the value of var "i" is 100 defer func() { fmt.Printf("defer i = %d\n",i) }() i = 100 // i = 100 fmt.Printf("i = %d\n",i) return
}
func main() {//testFunc1()//testFunc2()//testFunc3()testFunc4()}
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