JavaSE_WeekTwo_03_PerlArea.java
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import java.io.*;
public class PerlArea{
public static void main(String[] args) throws IOException{
double r, perl, area;
String str1 = "";
byte[] buf =new byte[100];
System.out.print("Please Input r:");
System.in.read(buf);
str1 = new String(buf);
r = Double.parseDouble(str1.trim());
System.in.close();
perl = 2*Math.PI*r;
area = Math.PI*r*r;
System.out.println("perl :" + perl);
System.out.println("area :" + area);
}
}
public class PerlArea{
public static void main(String[] args) throws IOException{
double r, perl, area;
String str1 = "";
byte[] buf =new byte[100];
System.out.print("Please Input r:");
System.in.read(buf);
str1 = new String(buf);
r = Double.parseDouble(str1.trim());
System.in.close();
perl = 2*Math.PI*r;
area = Math.PI*r*r;
System.out.println("perl :" + perl);
System.out.println("area :" + area);
}
}
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