void main() { for ( int i = 1 ; i < 10 ; i ++ ) { int a = 1; int b = pow ( 10 , i ); int c = pow ( 10 , a ); for ( int j = 0 ; j < b ; j ++ ) { if ( j != 0 && j % c == 0 ) a ++; int k = 1 ; while ( k <= i - a ) { cout < <"0"; k ++; } cout < <j; cout < <endl; }