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847天前package homework; |
import java.nio.channels.ScatteringByteChannel; |
import java.security.PublicKey; |
import java.util.Scanner; |
class polygon { |
private double a, n; |
polygon(double an, double nn) { |
a = an; |
n = nn; |
} |
private double angle() { |
return (((n-2)*180)/n)/2; |
} |
private double trangle() { |
double a1=a/2; |
double c = a1* Math.tan(angle()*(Math.PI/180)); |
return (float)c*a*0.5; |
} |
double area() { |
return n * trangle(); |
} |
} |
class main2 { |
public static void main(String[] args) { |
System.out.println("请输入边长和有几条边"); |
Scanner reader = new Scanner(System.in); |
double a =reader.nextDouble(); |
System.out.println("边长为 "+a+"cm"); |
double n = reader.nextDouble(); |
System.out.println("边有 "+n+"条"); |
if (a<=0 || n<3) |
System.out.println("输入错误"); |
polygon s = new polygon(a, n); |
System.out.println("面积为"+s.area()+"cm^2"); |
} |
} |
