B1:
#include<iostream>
using namespace std;
int main() {
int n;
float sum = 0;
cout << "Nhap n:";
cin >> n;
if(0<n<100){
for (size_t i = 1; i <= n; i++) {
sum += 1 * 1.0f / i;
}
cout << "s=" << sum;
}
else {
cout << "Nhap 0<n<100:";
}
}
Bai2:
#include<iostream>
using namespace std;
int main() {
int n;
int giai_thua = 1;
cout << "Nhap n:";
cin >> n;
if(0<n<7){
for (size_t i = n; i >= 1; i--) {
giai_thua *= i;
}cout << giai_thua;
}
else {
cout << "Nhap 0<n<7:";
}
}
