## 这题好难,先糊弄过去 package main import ( "fmt" ) func cal(p0, p1, op float64) float64 { switch op { case 0: return p0 + p1 case 1: return p0 - p1 case 2: return p0 * p1 case 3: return p0 / p1 } return -1 } func main() { var p0, p1, p2, p3 float64 _, _ = fmt.Scan(&p0, ...