On the difference of three kinds of integer functions in the math class in Java _java

Three large rounding functions in the math class

1.ceil

2.floor

3.round

In fact, three of the complete function is quite simple. Just remember the three function names translated Chinese can easily understand the three functions, described below

1.ceil, which means ceiling, is called up rounding in Java, and is greater than the nearest integer equal to that number.

Cases:
Math.ceil (13.2) =14

Math.ceil (-13.2) =-13

2.floor, meaning the floor, called down rounding in Java, is less than the nearest integer equal to the number

Cases:
Math.floor (13.2) =13

Math.floor (-13.2) =-14

3.round, the most special, is actually rounding

Cases:
Math.Round (13.2) =13;math.round (13.5) =14

Math.Round ( -13.2) =-13,math.round (-13.5) =-13

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