1-1.0/2.0+1.0/3.0-1.0/4.0+....

/*问题：1+1.0/2.0+1.0/3.0+1.0/4.0+....      1-1.0/2.0+1.0/3.0-1.0/4.0+....时间：2016/4/10*/#include <stdio.h>int main(void){int cout;while (scanf_s("%d", &cout) == 1){double sum1 = 0;double sum2 = 0;int sign = 1;for (int i = 1; i <= cout; i++){sum1 = sum1 + 1.0 / i;sum2 = sum2 + sign *1.0 / i;sign = -sign;}printf("sum1= %lf, sum2=%lf \n", sum1, sum2);}return 0;}