What is the error in the code

#1

#include
using namespace std;
int main()
{
int val;
int m,n;
cin>>m>>n;
int val=1;
for(int row=0;row<=m-1;row++)
{
for(int col=0;col<=n-1;col++)
{
a[row][col]=val;
val=val+1;
cout<<a[row][col]<<" ";
}
cout<<endl;

}
for(int col=0;col<n;col++)
{
	if(col%2==0)
	{
		for(int row=0;row<m;row++)
		{
			cout<<a[row][col]<<" ";
		}
	}
	else {
		for(int row=m-1;row>=0;row--)
		{
			cout<<a[row][col]<<" ";
		}
	}
}
return 0;

}

#2

hello @shdanish1508,
a) u r not taking input . u r just hardcoding values in matrix
b)u need to print ,( comma) after printing each number and then in the last u need to print END ( please check sample input output)

#3

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