double型强制转换成int型的取整方法, java中向上向下及四舍五入取整的方法 | 您所在的位置:网站首页 › double转化成int › double型强制转换成int型的取整方法, java中向上向下及四舍五入取整的方法 |
例子1(double型强制转换成int型):
直接舍掉小数,只留下整数。 正数: double d = 5.5; int i = (int)d; System.out.println("i=:"i); //输出5 double b = 5.9; int i1 = (int)b; System.out.println("i1=:"i1); //输出5 double c = 5.2; int i2 = (int)c; System.out.println("i2=:"i2); //输出5 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 负数: double d = -5.5; int i = (int)d; System.out.println("i=:"i); //输出-5 double b = -5.9; int i1 = (int)b; System.out.println("i1=:"i1); //输出-5 double c = -5.2; int i2 = (int)c; System.out.println("i2=:"i2); //输出-5例子2(三种取整的方法): 向上取整:Math.ceil(double a) 向下取整:Math.floor(double a) 四舍五入取整:Math.round(double a) 这里要注意Math.round(double a)和Math.rint(double a),四舍五入取整要用Math.round(double a),千万不要用Math.rint(double a),后面我会再详细写Math.round(double a)和Math.rint(double a)的区别 double a = 35; double b = 20; double c = a/b; //等于1.75 System.out.println(c); //输出1.75 System.out.println(Math.ceil(c)); //向上取整输出2.0 System.out.println(Math.floor(c)); //向下取整输出1.0 System.out.println(Math.round(c)); //四舍五入取整输出2.0--------------------- 原文:https://blog.csdn.net/xmc281141947/article/details/53887126 |
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