What is bus error

#1

i got bus error in this program
Arrays-wave print column wise
#include
using namespace std;
int main()
{
int m,n;
cin>>m>>n;
int a[m][n];
for(int i=0;i<m;i++)
{
for(int j=0;j<n;j++)
{
cin>>a[i][j];
}
cout<<endl;
}
for(int j=0;j<n;j++)
{
if(j%2==0)
{
for(int i=m;i>=0;i–)
{
cout<<a[i][j]<<",";
}
}
else
{
for(int i=0;i<m;i++)
{
cout<<a[i][j]<<",";
}

	}
	cout<<"END";

}

return 0;
}

#2

hello @dreamerekta
pls save ur code here -> https://ide.codingblocks.com/
and share the link with me

#3

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