What is the bad way of programing?

Answer 1

Some thoughts:
1. Copying code examples/snippets and using them without understanding them.
2. Not leaving any whitespace as it makes your code too difficult to read and maintain.
3. Not including comments as it makes it both difficult for yourself or others to revisit your code.
4. Not testing as you go.
5. Insufficient testing before go-live.
6. Not keeping a version history.
7. Poor (meaningless) variable names.

Answer 2

without using comments

Answer 3

not following the ettiquete of writing program.
- comments
- tabs / spaces
- naming convention
- and copying without understanding.