8.1.01. Napisati program za izračunavanje sume niza:
             1 - 1/2  + 1/3 -+  ... -+ 1/n

Listing programa:

//12173001 izracunavanje sume niza 1 - 1/2  + 1/3 -+  ... -+ 1/n
#include<iostream>
#include<cstdlib>
#include<math.h>
using namespace std;

int main()
{
  double s=0,n;
  cout<<"n: ";
  cin>>n;
  for(int i=1; i<=n; ++i)
  {
   if(i%2==1)
   {
   s+=(1.0/i);
   }else
   {
		s-=(1.0/i);
   }
  }
  cout<<"Vrijednost sume: "<<s<<endl;
	return 0;
}
II Varijanta
//p12173001//
#include <iostream>
#include <cmath>
using namespace std;

int main()
{
	int i,n;
	double z,suma;
	cout<<"Do broja?"<>n;
	z=1;
	suma=0;
	if (n < 1 )
	{
		cout<<"Nekorektan unos!"<<=n;i++)
		suma=suma+(z*1/i);
		z= - z;
	}
	cout<<"Suma +- 1/n ="<<suma<<endl;
	return 0;
}

Ispis na ekranu:

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