poj1003

#include <stdio.h>

int main(int argc, char* argv[]){ float len; float sum; int num=1;

 scanf("%f",&len);

 while(len != 0.0) {  sum = 0.0;  num = 1;  while(sum < len)  {   sum += (1.0/(num+1)); //一定要是1.0!!

   num++;  }

  printf("%d card(s)/n",num-1);

  scanf("%f",&len); }

 return 0;}