34 lines
No EOL
811 B
Go
34 lines
No EOL
811 B
Go
package main
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import "fmt"
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type rect struct {
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width, height int
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}
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//this area method has a reciever type of *rect
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func (r *rect) area() int {
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return r.width * r.height
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}
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// Methods can be defined for either pointer or value reciever types
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// heres an example of a value receiver
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func (r rect) perim() int {
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return 2*r.width + 2*r.height
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}
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func main() {
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r := rect{width:10,height:5}
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//here we call the two methods defined for our struct
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fmt.Println("area:",r.area())
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fmt.Println("perim:",r.perim())
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//Go automatically handles conversion between values and pointers for method calls.
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//you may want to use a pointer receiver type to avoid copying on method calls or to allow
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//the method to mutate the receiving struct
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rp := &r
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fmt.Println("area:",rp.area())
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fmt.Println("perim:",rp.perim())
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} |