以10为进制取整

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int approximateToNearestMultiple(int number, int multiple) {     int nearestMultiple = (number + multiple / 2) / multiple * multiple;     return nearestMultiple; }         int number1 = 404;     int number2 = 406;     int multiple = 10;     int result1 = approximateToNearestMultiple(number1, multiple); -----400     int result2 = approximateToNearestMultiple(number2,multiple);------410

　　下面是lua语言的

 

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function roundToNearestTens(number, mulit)     return math.floor((number +mulit/2)/mulit)* mulit end     return roundToNearestTens(506,10);-----510