double sumcal(double e)
{
x05 double re=0,num=1;
x05 int i=1;
x05intx05flag=1;
x05while(1)
x05{
x05x05flag*=i;
x05x05if (num/flag
double sumcal(double e)
{
x05 double re=0,num=1;
x05 int i=1;
x05intx05flag=1;
x05while(1)
x05{
x05x05flag*=i;
x05x05if (num/flag