吴裕雄--天生自然 JAVA开发学习：Number & Math 类

int a = 5000;
float b = 13.65f;
byte c = 0x4a;

public class Test{

   public static void main(String args[]){
      Integer x = 5;
      x =  x + 10;
      System.out.println(x);
   }
}

public class Test {
    public static void main (String []args)
    {
        System.out.println("90 度的正弦值：" + Math.sin(Math.PI/2));
        System.out.println("0度的余弦值：" + Math.cos(0));
        System.out.println("60度的正切值：" + Math.tan(Math.PI/3));
        System.out.println("1的反正切值： " + Math.atan(1));
        System.out.println("π/2的角度值：" + Math.toDegrees(Math.PI/2));
        System.out.println(Math.PI);
    }
}

public class Main {
  public static void main(String[] args) {
    double[] nums = { 1.4, 1.5, 1.6, -1.4, -1.5, -1.6 };
    for (double num : nums) {
      test(num);
    }
  }   

  private static void test(double num) {
    System.out.println("Math.floor(" + num + ")=" + Math.floor(num));
    System.out.println("Math.round(" + num + ")=" + Math.round(num));
    System.out.println("Math.ceil(" + num + ")=" + Math.ceil(num));
  }
}