37 lines
541 B
C++
37 lines
541 B
C++
#include<stdio.h>
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#include<string.h>
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#define MAX 10000
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char a[MAX];
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void count(int n)
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{
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int tem,sum=0;
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while(n!=0)
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{
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sum+=n%10;
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n/=10;
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}
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if(sum<10)
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{
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printf("%d\n",sum);
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}
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else
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{
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count(sum);
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}
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}
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int main()
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{
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int i,num,len;
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while(scanf("%s",a)&&a[0]!='0')
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{
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num=0;
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len=strlen(a);
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for(i=0;i<len;i++)
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{
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num+=(a[i]-'0');
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}
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count(num);
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}
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return 0;
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}
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