实现两个数之间的加减乘除
import java.util.Scanner; //实现两个数之间的四则运算 public class Demo03 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); //将scanner对象导入 double result = 0; //分别输入计算的数字和符号 System.out.print("请输入第一个数字"); double num1 = scanner.nextDouble(); System.out.print("请输入运算字符"); String operate = scanner.next(); System.out.print("请输入第二个数字"); double num2 = scanner.nextDouble(); //switch语句来判断计算符号 switch (operate){ case "+" : result = add(num1,num2); break; case "-" : result = sub(num1,num2); break; case "*" : result = mult(num1,num2); break; case "/" : result = div(num1,num2); break; } System.out.println(result); } //定义加、减、乘、除四个方法 public static double add(double num1, double num2){ return num1 +num2; } public static double sub(double num1, double num2){ return num1-num2; } public static double mult(double num1, double num2){ return num1*num2; } public static double div(double num1, double num2){ return num1/num2; } }