Why i am geetng wron answr

[Abhinav_Jha]

#include
using namespace std;
int main() {
int n,m,a[100][100];
cin>>n>>m;
for(int r=0;r<n;r++)
{
for(int c=0;c<m;c++)
{
cin>>a[r][c];
}
}
for(int c=0;c<m;c++){
if(c%2==0)
{
for(int r=0;r<n;r++)
{
cout<<a[r][c]<<", ";

		}
		

	}


	else
	{
		for(int r=n-1;r<0;r--)
		{
			cout<<a[r][c]<<", ";

		}
		

	}
}
cout<<"END";

}

[aman212yadav (Aman Yadav)]

@Abhinav_Jha
hello Abhinav,

for(int r=n-1;r<0;r–) { cout<<a[r][c]<<", "; }

here it should be r >= 0 in place of r < 0