expr is for Tcl to do math operations. It takes all of its arguments ("2 + 2" for example) and evaluates the result as a Tcl "expression". Many commands use expr behind the scenes in order to evaluate test expressions, such as if, whil…
Floating Point Math Your language isn't broken, it's doing floating point math. Computers can only natively store integers, so they need some way of representing decimal numbers. This representation comes with some degree of inaccuracy. That's why, m…
目录 1. Math 对象:数学对象,提供对数据的数学计算.如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 2. Number 对象 :Js中提供数字的对象.包含整数.浮点数等等.并提供数字的类型转换.小数点截取等方法. 1. Math 对象 1.1 介绍 Math 对象,是数学对象,提供对数据的数学计算,如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 1.2 构造函数 无 :Math 对象无构造函数,无法被初始化,只提供静态属性和方法…