Miss__1的博客

#include <stdio.h> void main() { double eps,sum=0.0,n;//sum必须赋值 int i=1,flag=1; scanf("%lf",&eps); n=1.0/i; while(n>eps) { sum+=flagn; i+=3; flag=-1flag; n=1.0/i; } sum+=flag*n;//最后一项没算进去 printf(“sum = %.6f”,sum); } ...