java - 使用 if 语句求 3 个变量中的最小值

Question

我正在学习如何使用 BlueJ，并且正在努力编写代码以输出用户输入的最小数字。任何帮助将不胜感激!

import java.util.Scanner;
public class FindMin
{
    public static void main(String[] args)
    {
        System.out.print("Program to compare three numbers");
        System.out.println("and output minimum value entered");

        Scanner input = new Scanner(System.in);

        System.out.print("Enter 1st number: ");
        int number1;
        number1 = input.nextInt();

        System.out.print("Enter 2nd number: ");
        int number2;
        number2 = input.nextInt();

        System.out.print("Enter 3rd number: ");
        int number3;
        number3 = input.nextInt();

        int minimum;
        if (number2 > number1 | number3 > number1){
            minimum = number1;
        }
        else if (number1 > number2 | number3 > number2){
            minimum = number2;
        }
        else if (number1 > number3 | number2 > number3){
            minimum = number3;
        }

        System.out.print("The minimum of the numbers entered is ");
        System.out.println(minimum); 
        System.out.println(); 
    }
}

Answer 1

| 是按位或运算符。您需要 &&，逻辑 AND 运算符。 “如果number2大于number1并且number3大于number1。”另外，您不希望在最后一个 else 上有任何 if，因为到那时您已经排除了三种可能性中的两种，只剩下一种可能性。

另外，我们需要处理 number1 和 number2 相同且都低于 number3 的情况。这可以通过在第一个 if 中使用 >= 而不是 > 来完成。

所以:

if (number2 >= number1 && number3 > number1) {
    // −−−−−^−−−−−−−−−−^^
    minimum = number1;
} else if (number1 > number2 && number3 > number2) {
    // −−−−−−−−−−−−−−−−−−−−−−^^
    minimum = number2;
} else /* No `if` here */ {
    minimum = number3;
}

JavaScript 示例(因为上述逻辑和语法对于 Java 和 JavaScript 来说是通用的):

function test(number1, number2, number3) {
    let minimum;
    if (number2 >= number1 && number3 > number1) {
        // −−−−−−^−−−−−−−−−^^
        minimum = number1;
    } else if (number1 > number2 && number3 > number2) {
        // −−−−−−−−−−−−−−−−−−−−−−^^
        minimum = number2;
    } else /* No `if` here */ {
        minimum = number3;
    }
    console.log(minimum);
}

test(1, 2, 3); // Should be 1
test(3, 2, 1); // Should be 1
test(2, 2, 1); // Should be 1
test(2, 2, 4); // Should be 2