Question

Se citeste un numar natural n. Sa se afiseze suma numerelor de la 1 la n folosind suma
lui Gauss.
In c++

Answer 1

#include <iostream>

using namespace std;

int main()

{unsigned int n,i,S;

cin>>n;

S=n*(n+1)/2;

cout<<"Suma 1+2+3+...+"<<n<<" este "<<S<<endl;

return 0;

}

Answer 2

unsigned int n;

cin>>n;

cout<<n*(n+1)/2;

return 0;