Why this program is not functioning properly ?

 package assignment1;
    import java.util.* ;
    public class q11
    {
    public static void main (String argc[] )    
    {
    Scanner e = new Scanner (System.in) ;
    int m  , c=0 ;
    int n;     // finding transpose of a matrix .
    
    System.out.println(" enter number of rows ");
    m= e.nextInt() ; // rows
    System.out.println(" enter number of columns");
    n =e.nextInt() ;//columns

    int twod[][] = new int [m][n] ; // 2d array created .   

    System.out.println(" enter array elements ");
 
    for ( int i = 0 ; i<=m-1 ; i++ )
    {
    for (int j=0 ; j <= n-1 ; j++)
    {
    twod [i][j] = e.nextInt() ;
    }
    }
 
    System.out.println(" array is :");
 
    for ( int i = 0 ; i<=m-1 ; i++)
    {
    for (int j=0 ; j <= n-1 ; j++)
    {
    System.out.print(twod[i][j]+"  ");
    }
     System.out.println("");
    }  
    // transposing matrix .
    for (int i =0 ; i<= m-1 ; i++)
    {
     for (int j=0 ; j<= n -1 ; j++)
     {

    c=twod[j][i] ;
    twod[j][i] = twod[i][j] ;       
    twod[i][j] = c ;
  
     }
         }
 
    System.out.println(" transposed array is : ");
    for ( int i = 0 ; i<=m-1 ; i++)
    {
    for (int j=0 ; j <= n-1 ; j++)
    {
    System.out.print(twod[i][j]+"  ");
    }
     System.out.println("");
    }
 
 
}
        
        
        }