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843天前package Y_S; |
import java.util.Scanner; |
class A { |
double r; |
double a, b, c; |
double circle() { |
// 圆面积 |
double S = 3.14 * this.r * this.r; |
return S; |
} |
double triangle() { |
// 三角形面积 |
double p = (a + b + c) / 2; |
double S = Math.sqrt(p * (p - a) * (p - b) * (p - c)); |
return S; |
} |
|
} |
public class F { |
public static void main(String[] args) { |
Scanner input = new Scanner(System.in); |
System.out.printf("输入圆的半径：\n"); |
double R = input.nextInt(); |
A a = new A(); |
a.r = R; |
double s1 = a.circle(); |
System.out.printf("圆的面积是：%f\n", s1); |
System.out.printf("输入三角形的边长：\n"); |
double A = input.nextInt(), B = input.nextInt(), C = input.nextInt(); |
a.a = A; |
a.b = B; |
a.c = C; |
double s2 = a.triangle(); |
System.out.printf("三角形的面积是：%f", s2); |
} |
} |
