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为什么连999都出问题呢?请高人指点

Posted by cpp051000448166 at 2005-04-26 21:45:51 on Problem 1519
#include <iostream>
using namespace std;
int i,n,sum,a[100000];
int boot(int );
void main()
{
	while (1)
	{
		cin>>n;
		if(n==0)
			break;
		else
			if(n>=10)
			{
				sum=boot(n);
				cout<<sum<<endl;
			}
			else
				cout<<n<<endl;
	}
}
int boot(int n)
{
	
		for(i=0;n>0;i++)
		{
			a[i]=n%10;
			n=n/10;
		}
		
		for(i=0;a[i]>0;i++)
		{
			n+=a[i];
		}
		if(n>=10)
		n=boot(n);
		return n;
		
}

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