試試這個(gè)

#include?<stdio.h>

int?main()?{
????//?init?var
????float??i_deno?=?1,?i_mole?=?2;
????//?loop?var
????int?i?=?0,?i_loopCtl?=?1;
????//?result?var
????float?f_sum?=?0;

????printf("How?many?items?to?calculate?\n");
????scanf("%d",?&i_loopCtl);
????printf("The?sum?of?the?first?%d?terms?will?be?calculated\n",?i_loopCtl);

????for?(;?i?<?i_loopCtl;?i++)?{
????????f_sum?+=?i_mole/i_deno;
????????int?i_tmp?=?i_mole;
????????i_mole?+=?i_deno;
????????i_deno?=?i_tmp;
????}???

????printf("The?sum?is?:?%f\n",?f_sum);

????return?0;
}