1.
#include <iostream>
using namespace std;
int main()
{
for (int i = 2; i <= 100; i += 2)
cout << i << " ";
}
2.
С использованием арифметической прогрессии
#include <iostream>
using namespace std;
int main()
{
cout << ((1 + 50) * 50) / 2;
}
Решение "в лоб"
#include <iostream>
using namespace std;
int main()
{
int sum = 0;
for (int i = 1; i <= 50; i++)
sum += i;
cout << sum;
}
3.
#include <iostream>
using namespace std;
int main()
{
int sum = 0;
for (int i = 1000; i >= 0; i--)
cout << i << " ";
cout << "\n Hello World";
}
4.
#include <iostream>
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
if (a > b)
for (int i = a; i >= b; i--)
cout << i << " ";
else
for (int i = b; i >= a; i--)
cout << i << " ";
}
