Wave print problem

#1

what is wrong in this code as output is perfect but not matching
#include
using namespace std;
int main() {
int c,r;
cin>>r>>c;
int a[r][c];
for(int i=0;i<r;i++)
{
for(int j=0;j<c;j++)
{
cin>>a[i][j];
}
}
for(int i=0;i<r;i++)
{
if(i%2==0)
{
for(int j=0;j<c;j++)
{
cout<<a[j][i]<<", “;
}
}
else{
for(int j=c-1;j>=0;j–)
{
cout<<a[j][i]<<”, ";
}
}
}
cout<<“END”<<endl;
return 0;
}

#2

see there is some logical problem

u need to print row wise and traverse column wise
go from col 0 to c
and for each element to be printed go from 0 to r-1
else r-1 to 0

for (int i = 0; i < c; i++)
{
if (i % 2 == 0)
{
for (int j = 0; j < r; j++)
{
cout << a[j][i] << ", ";
}
}
else
{
for (int j = r-1; j >= 0; j–)
{
cout << a[j][i] << ", ";
}
}
}

#3

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