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#2
rjsp2016-06-22 19:14
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#include <iostream>
using namespace std;
int main()
{int i=0,n;
long double j,m=0;
cin>>n;
while(i<=n)
{
if(i%2!=0) j=1/i;
else j=(-1.0)/i;
m=m+j;
i++;
}
cout<<"m="<<m<<endl;
system ("pause");
return 0;
}