```
package main
import (
"fmt"
"errors"
"os"
)
const rows, columns = 9, 9
type Grid [rows][columns]int8
func main() {
var g Grid
err := g.Set(6,2,5)
if err != nil {
fmt.Println("A",err)
fmt.Printf("An error occurred: %v.\n", err)
os.Exit(1)
}
}
func (g *Grid) Set(row, column int, digit int8) error {
if !inBounds(row, column) {
return errors.New("out of bounds")
}
g[row][columns] = digit
return nil
}
func inBounds(row, column int) bool {
if row < 0 || row >= rows {
return false
}
if column < 0 || column >= columns{
return false
}
return true
}
```
错误：
#command-line-arguments
./a.go:26:10: invalid argument: array index 9 out of bounds [0:9]
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