Java實現接受使用者輸入的兩個數,分別求這兩個數的和,差,積,商,模(條件語句)
阿新 • • 發佈:2020-12-21
import java.util.Scanner;
public class Main {
/**
* @author jadexu
* @// TODO: 2020/12/17
* 接受使用者輸入的兩個數,分別求這兩個數的和,差,積,商,模(帶異常處理)
*/
public static void main(String[] args) {
//儲存運算子
final char[] ARITHMETIC = { '+', '-', '*', '/', '%' };
//接收第一個數
double num1 = getNum(1);
//接收第二個數
double num2 = getNum(2);
//輸出這兩個數的和,差,積,商,模
for (char a : ARITHMETIC) {
System.out.printf("%.2f %c %.2f = %.2f\n",num1,a,num2,calculate(num1, num2, a));
}
}
//接收數字(帶異常處理,防止輸入的數不是數字)
private static double getNum(int n){
Scanner sc = new Scanner(System.in);
double num = 0;
System.out.print("請輸入第" + n + "個數:");
try {
num = sc.nextDouble();
} catch (Exception e) {
System.out.println("格式錯誤,重新輸入");
num = getNum(n);
}
return num;
}
//簡易計算器
public static double calculate(double num1, double num2, char a) {
double result = 0;
switch (a) {
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
case '%':
result = num1 % num2;
break;
}
return result;
}
}