1到N中1出现的次数

#ifndef NUMBER_OFONEINDATA_H
#define NUMBER_OFONEINDATA_H
#include<iostream>
unsigned int    numberOfOneInData(unsigned int    v_data){
	if(v_data<=0){
		return 0; 
	}
	unsigned int    oneCount=0; 
	unsigned int    iFactor=1; 
	unsigned int    icurrentUnitNum=0; 
	unsigned int    iLowerNum=0; 
	unsigned int    iHigherNum=0; 
	while(v_data/iFactor!=0){
		iLowerNum=v_data-(v_data/iFactor)*iFactor; 
		icurrentUnitNum=(v_data/iFactor)%10; 	
		iHigherNum=v_data/(iFactor*10); 
			switch (icurrentUnitNum)
		{
			case 0:
				oneCount+=iHigherNum*iFactor; 
				break; 
			case 1:
				oneCount+=iHigherNum*iFactor+iLowerNum+1; 
				break; 
			default:
				oneCount+=(iHigherNum+1)*iFactor; 
				break;
		}
		iFactor=iFactor*10; 
	}
	return oneCount; 
}
#endif