通过指针修改变量得的案例

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var a  int = 123
fmt.Println(a,&a)


var b *int = &a
fmt.Println(b,&b)


*b = 345
fmt.Println(a,&a,b,&b)


结果：123 0xc00000a0a0
0xc00000a0a0 0xc000006030
345 0xc00000a0a0 0xc00000a0a0 0xc000006030