PAT：1005. Spell It Right (20) AC

#include<stdio.h>
#include<string.h>
char alp[10][10]={"zero","one","two","three","four","five","six","seven","eight","nine"};
char str[1200];
int main()
{
  scanf("%s",str);
  int len=strlen(str);
  int sum=0;
  for(int i=0 ; i<len ; ++i)
    sum+=str[i]-'0';
  if(sum==0)          //判0，直接输出zero
  {
    printf("zero");
    return 0;
  }
  int RESI=0;
  int RES[100];
  while(sum!=0)
  {
    RES[RESI]=sum%10;
    sum/=10;
    ++RESI;
  }
  for(int i=RESI-1 ; i>=0 ; --i)
  {
    printf("%s",alp[RES[i]]);
    if(i!=0)
      printf(" ");
  }
  return 0;
}