根号2的小数点后100位
package 根号2的小数点后100位;
import java.util.*;
import java.math.*;
public class QuickPower {
public static void main(String[] args) {
// TODO Auto-generated method stub
double d=Math.sqrt(2);
String s=String.valueOf(d);
s=s.substring(0,s.length()-1);
BigDecimal b=new BigDecimal("2");
//compareTo(int val) -> comparable
//compare(int a,int b) -> comparator
for(int i=0;i<100;i++){
for(int j=0;j<9;j++){
if(new BigDecimal(s+j).pow(2).compareTo(b)<0){
s+=j;
}
}
}
System.out.println(s);
}
}
输出结果：
1.414213562373095012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678012345678