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package main import "fmt" func increment(n *int) { *n++ } func main() { // Pointers x := 10 p := &x fmt.Println("x =", x, " *p =", *p) increment(&x) fmt.Println("after increment, x =", x) // Arrays vs slices arr := [3]int{1, 2, 3} // fixed-size array sl := arr[:] // slice of the array sl = append(sl, 4, 5) // grows beyond original array fmt.Println("arr:", arr) // unchanged fmt.Println("sl :", sl) // make a slice directly nums := make([]int, 0, 5) for i := 0; i < 5; i++ { nums = append(nums, i*i) } fmt.Println("squares:", nums) // Maps scores := map[string]int{ "Alice": 95, "Bob": 87, } scores["Carol"] = 91 if v, ok := scores["Dave"]; ok { fmt.Println("Dave:", v) } else { fmt.Println("Dave not found, zero value:", v) } for name, score := range scores { fmt.Printf("%s: %d ", name, score) } }
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