使用Java的基本计算器程序

2024-05-17 06:34:05 369

示例

import java.util.Scanner; public class Calculator { public static void main(String[] args) { double num1; double num2; double ans; char op; Scanner reader = new Scanner(System.in); System.out.print("Enter two numbers: "); num1 = reader.nextDouble(); num2 = reader.nextDouble(); System.out.print("\nEnter an operator (+, -, *, /): "); op = reader.next().charAt(0); switch(op) { case '+': ans = num1 + num2; break; case '-': ans = num1 - num2; break; case '*': ans = num1 * num2; break; case '/': ans = num1 / num2; break; default: System.out.printf("Error! Enter correct operator"); return; } System.out.print("\nThe result is given as follows:\n"); System.out.printf(num1 + " " + op + " " + num2 + " = " + ans); } }

输出结果

Enter two numbers: 10.0 7.0 Enter an operator (+, -, *, /): - The result is given as follows: 10.0 - 7.0 = 3.0

现在让我们了解上面的程序。

从用户处获得两个数字以及运算符。证明这一点的代码片段如下-

double num1; double num2; double ans; char op; Scanner reader = new Scanner(System.in); System.out.print("Enter two numbers: "); num1 = reader.nextDouble(); num2 = reader.nextDouble(); System.out.print("\nEnter an operator (+, -, *, /): "); op = reader.next().charAt(0);

开关盒用于对两个数字执行指定的操作。如果输入的运算符不正确，则会显示错误消息。证明这一点的代码片段如下所示-

switch(op) { case '+': ans = num1 + num2; break; case '-': ans = num1 - num2; break; case '*': ans = num1 * num2; break; case '/': ans = num1 / num2; break; default: System.out.printf("Error! Enter correct operator"); return; }

最后，打印结果。证明这一点的代码片段如下所示-

System.out.print("\nThe result is given as follows:\n"); System.out.printf(num1 + " " + op + " " + num2 + " = " + ans);

使用Java的基本计算器程序

示例

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