Resolve the error in the code

#1

cannot find where am i wrong

#2
#3

now it is working check it

#4

for(int row=0;row<n;row++)
{
scol=0;
ecol=n-1;
while(scol<ecol)
{
swap(a[i][scol],a[i][ecol]);
scol++;
ecol–;
}
}

here instead of i use row