从StdIn读取字符

本文介绍了从StdIn读取字符的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 public class New { public static void main(String[] args) { System.out.println("Calculator"); float a = StdIn.readFloat(); char sign = StdIn.readChar(); float b = StdIn.readFloat(); float c = 0; if (sign == '+') c = a+b; else if (sign == '-') c = a-b; else if (sign == 'x') c = a*b; else if (sign == '/') c = a/b; System.out.println(c); } }

代码，我试图做一个计算器，使用字符和float数据类型的StdIn输入。

I need some help with this bit of code, I'm attempting to make a calculator that takes StdIn input with both character and float data types.

推荐答案

Scanner class。

像这样：

import java.util.Scanner; public class New { public static void main(String[] args) { System.out.println("Calculator"); Scanner scanner = new Scanner(System.in); System.out.println("Enter Parameter "); System.out.print("a : "); float a = scanner.nextFloat(); System.out.print("+|-|*|/: "); String op = scanner.next(); System.out.print("b : "); float b = scanner.nextFloat(); float c = 0; switch (op) { case "+": c = a + b; break; case "-": c = a - b; break; case "*": c = a * b; break; case "/": c = a / b; break; default: System.out.println("Illegal operant"); } System.out.println("Result: " + c); } }

我添加了一个开关盒而不是else ifs。

I added a switch case instead of the else ifs.