設計一個 func printer(mode: Int, size: Int) mode = 0 時會用 * 印出一個直角三角形 mode = 1 時則會用 * 印出一個等腰三角形 size 為三角形的高度 (共幾層 * 堆疊)

CatEatSwift.swift

func printer(mode: Int, size: Int) {
        guard size >= 2 else { return }
        switch mode {
        case 0:
            for i in 1...size {
                for _ in 1...i {
                    print("*", terminator: "")
                }
                print("")
            }
        case 1:
            for i in 1...size {
                for _ in 0..<(size - i) {
                    print(" ", terminator: "")
                }
                
                for _ in 1...(2 * i - 1) {
                    print("*", terminator: "")
                }
                print("")
            }
            
        default:
            break
        }
    }

printer(mode: 0, size: 6)
//output: 
*
**
***
****
*****
******
printer(mode: 1, size: 5)
//output: 
    *
   ***
  *****
 *******
*********
//13行: 雷區
//    fatal error: Can't form Range with upperBound < lowerBound
//Game Points + 1