Răspuns:
1)
#include <iostream>
using namespace std;
int main()
{
int n,i,S=0;
cout<<"n=";
cin>>n;
for(i=1;i<=n;i++)
if(i%2==1)
S=S+i;
cout<<S;
return 0;
}
2)
#include <iostream>
using namespace std;
int main()
{
int n,i;
cout<<"n=";
cin>>n;
for(i=1;i<=n;i++)
if(i%3==0)
cout<<i<<" ";
return 0;
}
SUPLIMENTAR
#include <iostream>
using namespace std;
int main()
{
int n,i,S=0;
cout<<"n=";
cin>>n;
for(i=1;i<=n;i++)
{
if(i%2==1)
S=S+(4*i-1);
else
S=S-(4*i-1);
}
cout<<S;
return 0;
}
Explicație:
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