Question

un program care calculeaza suma numerelor pare din intervalul [2. n]

Answer 1

#include <iostream>

using namespace std;
int n,i,s=0;
int main()
{
    cout<<"n=";cin>>n;
    for(i=2;i<=n;i++)
        if(i%2==0)
        s+=i;
    cout<<"suma="<<s;
    return 0;
}