Swift学习日记002

以学习日记001里面知识点为基础，构建第一个命令行的swift工程，功能很简单，生成一个随机数（0-100范围内），输入后进行各种判读输出，代码如下：

所需的算法文件链接：http://www.raywenderlich.com/wp-content/uploads/2014/10/helpers.swift_.zip

import Foundation

//随机数
let answer = randomIntBetween(0, high: 100)

//输入次数
var turn = 1

while (true){
    print("Enter a number between 1 and 100 .")
    
    let userInput = input()
    
    let inputAsInt = Int(userInput)
    
    if let guess = inputAsInt{
        if(guess > answer) {
            print("Lower!")
        } else if(guess < answer) {
            print("Higher!")
        } else {
            print("Correct! The answer was \(answer).")
            break;
        }
    }else{
        print("Invalid input! Please enter a number.")
    }
    turn += 1
}

print("It took you \(turn) times to find right answer!")