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package main
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import (
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"fmt"
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)
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func main() {
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var c chan int // 信道 c 的值为 nil
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if c == nil {
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fmt.Println("channel a is nil, going to define it")
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c = make(chan int)
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fmt.Printf("Type of c is %T", c) // 打印通道类型
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}
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fmt.Printf("\n")
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a := make(chan int)
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fmt.Printf("%T", a) // chan int
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}
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