基础语法实例——猜数游戏 ｜ 青训营

由于是猜数，我们肯定需要先有可以猜的数。所以我们需要生成一个随机数。

package main

import (
	"fmt"
	"math/rand"
)

func main() {
	maxNum := 100
	secretNumber := rand.Intn(maxNum)
	fmt.Println("The secret number is ", secretNumber)
}

虽然是产生了随机数，但是每一次生成的数字都是一样的。这是因为我们生成随机数的种子没有改变，需要让种子发生变化才能使每次生成的随机数不同，可以使用一直在不断变化的时间作为我们的种子。

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	maxNum := 100
	// 使用一直在不断变化的时间作为我们的种子
	rand.Seed(time.Now().UnixNano())
	// 设置种子之后产生一个最大为100的整形
	secretNumber := rand.Intn(maxNum)
	fmt.Println("The secret number is ", secretNumber)
}

接下来使用fmt.Scanf实现输入我们猜的数字。

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	maxNum := 100
	rand.Seed(time.Now().UnixNano())
	secretNumber := rand.Intn(maxNum)
	fmt.Println("The secret number is ", secretNumber)

	fmt.Println("Please input your guess")
	var guess int
	// 输入我们猜的数字
	_, err := fmt.Scanf("%d", &guess)
	// Go语言中处理错误的方法
	if err != nil {
		fmt.Println("Invalid input. Please enter an integer value")
		return
	}
	fmt.Println("You guess is", guess)
}

实现完整的猜数逻辑。

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	maxNum := 100
	rand.Seed(time.Now().UnixNano())
	secretNumber := rand.Intn(maxNum)
	fmt.Println("The secret number is ", secretNumber)

	fmt.Println("Please input your guess")
	var guess int
	_, err := fmt.Scanf("%d", &guess)
	if err != nil {
		fmt.Println("Invalid input. Please enter an integer value")
		return
	}
	fmt.Println("You guess is", guess)
	// 通过 if-else 来看你是否猜对，若没猜对告诉你猜大了还是猜小了
	if guess > secretNumber {
		fmt.Println("Your guess is bigger than the secret number. Please try again")
	} else if guess < secretNumber {
		fmt.Println("Your guess is smaller than the secret number. Please try again")
	} else {
		fmt.Println("Correct, you Legend!")
	}
}

最后，加入for循环，项目实现完成。

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	maxNum := 100
	rand.Seed(time.Now().UnixNano())
	secretNumber := rand.Intn(maxNum)
	// 作弊模式
	// fmt.Println("The secret number is ", secretNumber)

	fmt.Println("Please input your guess")
	// 通过一个 for 循环实现一直猜数，直到猜中
	for {
		var guess int
		_, err := fmt.Scanf("%d", &guess)
		if err != nil {
			fmt.Println("Invalid input. Please enter an integer value")
			continue
		}
		fmt.Println("You guess is", guess)
		if guess > secretNumber {
			fmt.Println("Your guess is bigger than the secret number. Please try again")
		} else if guess < secretNumber {
			fmt.Println("Your guess is smaller than the secret number. Please try again")
		} else {
			fmt.Println("Correct, you Legend!")
			break
		}
	}
}