关于c语言,程序可求出数列1,-3!,5!,-7!,…,(-1)n-1(2n-1)!前n项的...答:float pow(float x, float y);//说明:x应大于零,返回幂指数的结果。include<stdio.h>#include<math.h>int fun(int n) //求阶乘{if(n == 1)return 1;elsereturn n*fun(n-1);}void main(){int i,n,sum1=1,sum2,sum=0;printf("Please input value of n:\n");scanf("%d",&...