e3_10.java

来自「java 初学者学习实例」· Java 代码 · 共 41 行

class Sum
{
  int n;
  float f()
  {
  	float sum = 0;
  	for(int i=1;i<=n;i++)
  	  sum=sum+i;
  	return sum;
  }
}

class Average extends Sum
{
  int n;
  float f()
  {
  	float c;
  	super.n=n;
  	c=super.f();
  	return c/n;
  }
  float g()
  {
  	float c;
  	c=super.f();
  	return c/2;
  }
}
public class E3_10
{
  public static void main(String args[])
  {
  	Average aver = new Average();
  	aver.n=100;
  	float result_1 = aver.f();
  	float result_2 = aver.g();
  	System.out.println("result_1=  "+ result_1);
  	System.out.println("result_2=  "+ result_2);
  }
}