realtest.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

/**
 * 专家导学：Java面向对象编程
 */
package chapter3;

/**
 * @author Administrator
 *
 */
public class realTest 
{
    /**
     * 求圆周率pi
     * @param args
     */
	public static void main(String[] args) 
	{
		float girth = 25.1955f; //周长；
		float r = 4.01f; //半径；
				
		float pif = girth/(2*r);   //2pir 求单精度型的pi
		double pid = girth/(2*r);   //2pir 求双精度型的pi
		
		System.out.println("单精度型pi = " + pif);
		System.out.println("双精度型pi = " + pid);
		
	}

}