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Why WA?#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void main()
{
int n,i;
char a[15];
while(1)
{
scanf("%d",&n);
if(n==0)
break;
while(n>9)
{
itoa(n,a,10);
n=0;
for(i=0;i<strlen(a);i++)
{
n+=a[i]-'0';
}
}
printf("%d\n",n);
}
}
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