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这样都能WA?#include<stdio.h>
#include<math.h>
void main()
{
while(1)
{
int n;
scanf("%d",&n);
if(n==0) break;
loop:
int j=log10(n)+1,i,k=0;
for(i=0;i<j;i++)
{
k+=n%10;
n=n/10;
}
if(k<10) printf("%d\n",k);
else
{
n=k;
goto loop;
}
}
}
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