c语言sn=1+1/1!-1/2!+1/3!-1/4!???-1/10!输出结果保留两位小数

#include int fac(int i){ int j; int sum=1; for(j=1;j<=i;j++) { sum*=j; } return sum;}int main(){ int i; double sum=1; for(i=1;i<=10;i++) { sum+=i%2==0?-1./fac(i):1./fac(i); } printf("%lf