这个星星符号怎么打呀，我刚学习不会

printf(" *\n");
printf(" ***\n");
printf(" *****\n");
printf("*******\n");

#include <iostream>
using namespace std;
int main()
{  
    for (int i = 1; i <= 7; i++){
        if(i%2==1){
            for (int j = 1; j <= 7 - i; j++){
                cout << " ";
            }
            for (int k = 1; k <= i; k++){
                cout << "* ";
            }
            cout << endl;
        }        
    }
    system("pause");
    return 0;
}

printf("   *   \n  ***  \n ***** \n*******");