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&&的是逻辑 AND 运算符。“如果number2大于number1 并且 number3大于number1。” 另外，您不希望if最后一个出现任何情况else，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，我们要处理number1和number2相同且都低于 的情况number3。>=这可以通过使用而不是>第一个来完成if。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 都是通用的）：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 1test(3, 2, 1); // Should be 1test(2, 2, 1); // Should be 1test(2, 2, 4); // Should be 2

Answer 2

也可以用import java.util.*女巫自带的java.lang.Math。这允许您使用来自的方法Math，例如Math.min。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 = Math.min(Math.min(number1, number2), number3);        System.out.print("The minimum of the numbers entered is ");        System.out.println(minimum);         System.out.println();     }}

Answer 3

尝试以下方法并将您的三个数字作为参数传递。&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;static&nbsp;int&nbsp;getMinimumNumber(int&nbsp;no1,&nbsp;int&nbsp;no2,&nbsp;int&nbsp;no3)&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;no1&nbsp;<&nbsp;no2&nbsp;?&nbsp;(no1&nbsp;<&nbsp;no3&nbsp;?&nbsp;no1&nbsp;:&nbsp;(no2&nbsp;<&nbsp;no3&nbsp;?&nbsp;no2&nbsp;:&nbsp;no3))&nbsp;:&nbsp;(no2&nbsp;<&nbsp;no3&nbsp;?&nbsp;no2&nbsp;:&nbsp;no3); &nbsp;&nbsp;&nbsp;&nbsp;}

Answer 4

或者你可以这样做int minimum = 0;&nbsp; &nbsp; if(number1 < number2){&nbsp; &nbsp; &nbsp; &nbsp; minimum = number1;&nbsp; &nbsp; }else{&nbsp; &nbsp; &nbsp; &nbsp; minimum = number2;&nbsp; &nbsp; }&nbsp; &nbsp; if(number3<minimum){&nbsp; &nbsp; &nbsp; &nbsp; minimum = number3;&nbsp; &nbsp; }