#include <iostream>
using namespace std;
int main() {
int n, sum = 0;
cout << "Input n: ";
cin >> n;
cout << "Result: ";
for (int i = 1; i <= n; i++) {
if (i > 1) {
cout << " + ";
}
cout << i;
sum += i;
}
cout << "\n= " << sum << endl;
return 0;
}

Result

#include <iostream>
using namespace std;
int main() {
int n,i,j;
cout << "Enter n: ";
cin >> n;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
cout << "*";
}
cout << endl;
}
}

Result