hdoj1013

简单大数

#include<cstdio>int digitroot(int d){int sum,divide;divide=1;sum=0;while(d/divide!=0){sum+=(d/divide)%10;divide*=10;}return sum;}int main(){int d;char bignum[1000];int i=0;while(scanf("%c",&bignum[i])&&bignum[i++]!='0'){while(scanf("%c",&bignum[i])&&bignum[i++]!='\n');i=0;d=0;while(bignum[i]!='\n') d+=bignum[i++]-'0'; while(d>9) d=digitroot(d);printf("%d\n",d);i=0;}return 0;}