java完成计算器的程序
时间: 2023-10-31 08:05:32 浏览: 32
以下是一个简单的 Java 计算器程序:
```Java
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double num1, num2, result;
char operator;
System.out.print("Enter first number: ");
num1 = input.nextDouble();
System.out.print("Enter operator (+, -, *, /): ");
operator = input.next().charAt(0);
System.out.print("Enter second number: ");
num2 = input.nextDouble();
switch(operator) {
case '+':
result = num1 + num2;
System.out.println(num1 + " + " + num2 + " = " + result);
break;
case '-':
result = num1 - num2;
System.out.println(num1 + " - " + num2 + " = " + result);
break;
case '*':
result = num1 * num2;
System.out.println(num1 + " * " + num2 + " = " + result);
break;
case '/':
if(num2 == 0) {
System.out.println("Cannot divide by zero.");
} else {
result = num1 / num2;
System.out.println(num1 + " / " + num2 + " = " + result);
}
break;
default:
System.out.println("Invalid operator.");
break;
}
input.close();
}
}
```
该程序要求用户输入两个数字和运算符,然后根据运算符计算结果并输出。
例如,如果用户输入 4、* 和 5,则程序将输出“4.0 * 5.0 = 20.0”。
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