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public class CalcUtility
{
    /// <summary>
    /// »ØÄꤷ¤¿¾®¿ôÅÀ¤Î·å¿ô¤Ë¤Ê¤ë¤è¤¦¤Ë¡¢£±¤Ä²¼¤ÎÃͤò»Í¼Î¸ÞÆþ¤·¤¿ÃͤòÌ᤹
    /// </summary>
    /// <param name="value">·×»»¤¹¤ëÃÍ</param>
    /// <param name="digitsNum">»Ä¤·¤¿¤¤¾®¿ôÅÀ¤Î·å¿ô(¤³¤Î£±¤Ä²¼¤ÎÃͤò»Í¼Î¸ÞÆþ¤¹¤ë)</param>
    /// <returns></returns>
    public static float CalculateRoundHalfUp(float value, int digitsNum) {
        return float.Parse(value.ToString("F" + digitsNum.ToString()));
    }
}

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¡ã¤½¤Î£±¡ä
¡¡float x = 0.5522f;
  int digitsNum = 3;

  x = CalcUtility.CalculateRoundHalfUp(x, digitsNum);

  Debug.Log(x);

¡ãConsole ¥Ó¥å¡¼¡ä
  0.552



¡ã¤½¤Î£²¡ä
¡¡float x = 0.42f;
  float y = 0.45f
  int digitsNum = 1;

  if(CalcUtility.CalculateRoundHalfUp(x, digitsNum) >= 0.5f){

      Debug.Log("x");
  } 

  if(CalcUtility.CalculateRoundHalfUp(y, digitsNum) >= 0.5f){

      Debug.Log("y");
  } 

¡ãConsole ¥Ó¥å¡¼¡ä
  y

¡¡¾®¿ôÅÀ¤ÎÂè2°Ì¤ò»Í¼Î¸ÞÆþ¤·¤ÆÂè1°Ì¤ÎÃͤˤ·¤Þ¤¹¡£¤½¤Î¤¿¤á¡¢x = 0.4f¡¢ y = 0.5f ¤È¤Ê¤ê¤Þ¤¹¤Î¤Ç¡¢
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