版权声明:虽然我依旧蒟蒻,但请你尊重我 :D ——陈杉菜 https://blog.csdn.net/qq_44702847/article/details/88226868
这里用一个有简单计算功能的java代码当例子
刚刚接触java啥都不会
菜里转型 干巴嘚
无注释版
import java.util.Scanner;
public class Calc {
public int num1;
public int num2;
public double result=0.0;
public char operation;
public void calculate() {
if(operation == '+')
result=num1+num2;
else if(operation == '-')
result=num1-num2;
else if(operation == '*')
result=num1*num2;
else if(operation == '/')
if(num2 != 0)
result=num1*1.0/num2;
else
System.out.println("Incorrect input!");
else
System.out.println("Unrecognized Opeerator!");
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
Calc test = new Calc();
test.num1 = input.nextInt();
test.num2 = input.nextInt();
String s1 = input.next();
test.operation = s1.charAt(0);
test.calculate();
System.out.println("The calculation result is : "+test.result);
}
}
注释版
//Scanner input = new Scanner(System.in);
//int型数据 = input.nextInt();
//String型字符串 = input.next();
//char型字符 先获得String字符串在用字符串的charAt(0)方法 如:char1 = s1.charAt(0);
import java.util.Scanner;
public class Calc {
//定义两个运算数
public int num1;
public int num2;
//定义运算结果
public double result=0.0;
//定义运算符
public char operation;
//定义方法 calculate
public void calculate() {
if(operation == '+')
result=num1+num2;
else if(operation == '-')
result=num1-num2;
else if(operation == '*')
result=num1*num2;
else if(operation == '/')
if(num2 != 0)
result=num1*1.0/num2;
else
//除数是0,输出 输入错误 的提示
System.out.println("Incorrect input!");
else
//其他运算符,输出 无法识别运算符 的提示
System.out.println("Unrecognized Opeerator!");
}
public static void main(String[] args) {
// TODO Auto-generated method stub
//新建Scanner 对象 input
Scanner input = new Scanner(System.in);
Calc test = new Calc();
System.out.println("Input two arithmetic numbers and an operator to start calculation.");
//调用input的next()方法获取控制台输入 (int型数据)
test.num1 = input.nextInt();
test.num2 = input.nextInt();
//定义一个String类型的变量s1来接收控制台输入的字符 (String型字符串)
String s1 = input.next();
//调取变量s1的charAt(0)方法获取第一个字符 (char型字符)
test.operation = s1.charAt(0);
test.calculate();
System.out.println("The calculation result is : "+test.result);
}
}