~cpp
#include <iostream> 
using namespace std; 
int main(){ 
    int i,j,k,l; 
    for(i = 0; i < 5; i++){ 
        for(j = 0; j <= i; j++){ 
            cout << "*"; 
        } 
        for(k = 0; k < 5; k++){ 
            cout << " "; 
        } 
        for(l = 0 ; l < 5-i ; l++){ 
            cout << "*"; 
        } 
        cout << endl; 
    } 
    cout << endl;     

    return 0; 
} 

~cpp
#include <iostream> 
using namespace std; 
int factorial(int n){ 
    if(n<=1){ 
        return 1; 
    } 
    else{ 
        return n*factorial(n-1); 
    } 
} 
int main(){ 
    int number; 

    cin >> number; 

    cout << factorial(number) << endl; 
    return 0; 
}