C++编程之美-数字之魅(代码清单2-10)
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代码清单2-10
LONGLONG Sum1s(ULONGLONG n)
{
ULONGLONG iCount = 0;
ULONGLONG iFactor = 1;
ULONGLONG iLowerNum = 0;
ULONGLONG iCurrNum = 0;
ULONGLONG iHigherNum = 0;
while(n / iFactor != 0)
{
iLowerNum = n - (n / iFactor) * iFactor;
iCurrNum = (n / iFactor) % 10;
iHigherNum = n / (iFactor * 10);
switch(iCurrNum)
{
case 0:
iCount += iHigherNum * iFactor;
break;
case 1:
iCount += iHigherNum * iFactor + iLowerNum + 1;
break;
default:
iCount += (iHigherNum + 1) * iFactor;
break;
}
iFactor *= 10;
}
return iCount;
}