nyoj 803 大数问题

#include<stdio.h>
#include<string.h>
#define ll long long
#define N 110000
int main() {
   ll i,sum,b,k,len,f[N];
   char s[N],st[3];
   while(scanf("%s%s%lld",s,st,&b)!=EOF) {
     if(strcmp(st,"/")==0) {
        sum=0;len=0;
        for(i=0;s[i];i++) {
            sum=sum*10+s[i]-'0';
             f[len++]=sum/b;
             sum=sum%b;
        }
        k=0;
        for(i=0;i<len;i++) {
            if(k)
            printf("%lld",f[i]);
            else if(f[i]){
                k=1;
                printf("%lld",f[i]);
            }
        }
        if(k==0)
            printf("0");
        printf("\n");
     }
     else {
        sum=0;
        for(i=0;s[i];i++) {
            sum=sum*10+s[i]-'0';
            sum=sum%b;
        }
        printf("%lld\n",sum);
     }
   }
return 0;
}