/*?考慮這兩個無限序列：????1.0?+?1.0/2.0?+?1.0/3.0?+?1.0/4.0?+?...????1.0?-?1.0/2.0?+?1.0/3.0?-?1.0/4.0?+?...????編寫一個程序來計算這兩個序列不斷變化的總和，直到達到某個次數(shù)。讓用戶交互地輸入這個次數(shù)。?*/#include <stdio.h>int main (void){?? ?int j, fcf, i;?? ?double? sum1, sum2;?? ?printf ("請輸入次數(shù)：");?? ?while (1 == scanf ("%d",&i))?? ?{?? ??? ?for (sum1 = 0, j = 1, sum2 = 0, fcf = -1; j <= i; ++j)?? ??? ?{?? ??? ??? ??? ?fcf *= (-1);?? ??? ??? ?sum1 = sum1 + (1.0 / i);?? ??? ??? ?sum2 = sum2 + (1.0 / i) * fcf;?? ??? ?}?? ??? ??? ?printf ("%lf %lf\n",sum1,sum2);?? ??? ?printf ("請輸入另一個次數(shù)：");?? ?}?? ?system ("pause");?? ?return 0;}