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帮我看看哪里错了~谢谢!!!#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main ()
{
long N,sum=0,i;
char str[100];
memset(str,'0',100);
while(1)
{
scanf("%d",&N);
while(N>0)
{
sprintf(str,"%99d",N);
for(i=0;i<strlen(str);i++)
{
if(str[i]==' ')
sum=0;
else
sum+=str[i]-'0';
}
N=sum;
if(N<=9&&N>=0)
{
printf("%d",N);
break;
}
}
printf("\n");
}
}
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