float、double以及正负无穷大——2017.08.01

package Collection;
public class PrimitiveType {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		float f=5.45321562154655215f;//定义float类型后面必须加f
		float f1=5.2354f;    //对比两个输出结果之间的差异
		float  f2=54222.4541564664f;
		float  f3=574841154.021f;
        System.out.println(f);
        System.out.println(f1);
        System.out.println(f2);
        System.out.println(f3);
        /*
         * 5.4532156
           5.2354
           54222.453
           5.7484115E8
            经过对比我们发现如果float输出不超过8位
     数字E8表示乘以科学计算法
         */
	}

}

package Collection;

public class PrimitiveDouble {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
      double d1=23518811455.5144;
      double d2=2.5;
      System.out.println(d1);
      System.out.println(d2);
	}

	 //2.35188114555144E10
	//2.5
	//此时double可以不带d；
}

package Collection;

public class PrimitiveDouble {

	public static void main(String[] args) {

      System.out.println(3.2f/0);
      System.out.println(-3.2f/0);
      //Infinity     正无穷大
     // -Infinity    负无穷大
	}

	//Infinity     正无穷大
    // -Infinity    负无穷大
}