import java.io.*
import java.math.*
public class dis
{
public static void main(String [] s) throws Exception
{
Float a,b,c
double x2
double x1
System.out.println("请输入a, b, c的值")
BufferedReader bReader=new BufferedReader(new InputStreamReader(System.in))
a=Float.parseFloat(bReader.readLine())
b=Float.parseFloat(bReader.readLine())
c=Float.parseFloat(bReader.readLine())
if (b*b - 4*a*c <= 0)
System.out.println("输入的系数不对，b2-4ac不大于0！程序退出！")
else
{
x1 = (-b + Math.sqrt(b*b - 4*a*c))/2*a
x2 = (-b - Math.sqrt(b*b - 4*a*c))/2*a
System.out.println("x1 = "+ x1)
System.out.println("x2 = "+x2)
}
return
}
}
public class Test{public staitc void main(String args){
int i,j,k=3
for(i=0i<4k=k-1-i,i++)
{
for(j=0j<4+ij++)
{
if(j<k)
System.out.print(" ")
else
{
System.out.print("*")
j++
}
}
}
k=3
}
}
保存为Test.java，然后运行javac Test.java和java Test就可以运行了。。
