x = [ [ 1 , 2 , 3 ] , [ 4 , 5 , 6 ] , [ 7 , 8 , 9 ] ] temp = [] for i in ( 0..2 ) do temp[ i ] = x[ i ][ 2-i ] end for i in ( 0..2 ) do x[ i ][ 2-i ] = x[ i ][ i ] end for i in ( 0..2 ) do x[ i ][ i ] = temp[ i ] end for i in ( 0..2 ) do for j in ( 0..2 ) do printf( "%d " , x[ i ][ j ] ) end printf( "\n" ); end