整数除法，四舍五入

Question

There is integer variable, voltage in millivolts.有整数变量，以毫伏为单位的电压。

signed int voltage_mv = 134; //134mV

I have 2-segment display and I want to display hundredths of volts.我有 2 段显示器，我想显示百分之一的伏特。

How can I convert milivolts to hundredths volts in one operation?如何在一次操作中将毫伏转换为百分之一伏？ Without IF statement, without function?没有IF语句，没有函数？

134 => 13
135 => 14

Answer 1

How about simple rounding:简单的四舍五入怎么样：

int millivoltToDisplay (int millivolts)
{
  return (millivolts+5)/10;
}

(written as a function for clarity) （为了清楚起见，写成函数）

Answer 2

For the same of completeness, if the denominator is odd, then instead of doing:为了完整性，如果分母为奇数，则不执行：

return (millivolts+denominator/2)/denominator;

you can just have你可以拥有

return (2*millivolts+denominator)/(2*denominator);

and get the correct rounding.并得到正确的舍入。