How can print this figure by using loop

Question

*
* *
* * *

Answer 1

hi this is sample code

#include <iostream>
using namespace std;

#define ROW 3

int main() {

int i,j,k=0;

for(i=0;i<ROW;i++)
{
for (j=ROW-k;j>=0;j--)
cout <<"\t";

for(k=0;k<i+1;k++)
cout<<"*";

cout <<endl;
}
return 0;
}

Answer 2

but why
i=0;i <row
I can do this
i=1;i <=row