练习1

public class wendu{
public static void main(String args[])
{
int f;
double c;
for(f=300;f>=0;f=f-20)
{
c=((double)(5.0/9))*(f-32);
System.out.printf(f+"\t");
System.out.printf("%.1f",c);
System.out.printf("\n");
}
}
}