1519.cpp

这些是我到目前在PKU上做出的题目

#include <iostream.h>
#include <string.h>
int main()
{char a[1000];
 int sum,t,i;
 sum=0;
 cin>>a;
 for (i=strlen(a)-1;i>=0;i--) sum=sum+a[i]-48;
 while (sum!=0)
 {while (sum/10!=0)
  {t=0;
   while (sum!=0) {t=t+sum%10;sum=sum/10;}
   sum=t;}
  cout<<sum<<"\n";
  sum=0;
  cin>>a;
  for (i=strlen(a)-1;i>=0;i--) sum=sum+a[i]-48;}
return 0;}