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小刷两题慢慢来咯

题目一：差

608. 差 - AcWing题库

代码 

import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int a = sc.nextInt(), b = sc.nextInt();int c = sc.nextInt(), d = sc.nextInt();System.out.printf("DIFERENCA = %d\n",a*b-c*d);}
}

题目二：圆的面积

604. 圆的面积 - AcWing题库

代码

import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);double r = sc.nextDouble();System.out.printf("A=%.4f\n",r*r*3.14159);}
}