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请大家指教我错在哪里。。郁闷中……

Posted by chuizi_nudt at 2006-04-22 15:36:04 on Problem 2719
#include <stdio.h>
#include <math.h>
#include <string.h>

char a[10];
int res,b,i,la;

int main()
{
	while(1)
	{
		scanf("%s",a);
		la=strlen(a);
		if(strcmp(a,"0")==0)
			break;
		res=0;
		for(i=la-1;i>=0;i--)
		{
			b=(int)(a[i]-'0');
			if(b>=4) b--;
			res+=b*(int)pow(9,la-i-1);
		}
		printf("%d\n",res);
	}
	return 0;
}




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