Will making error correct or understanding it what is the error help me to not making errors again?

Question

Is it mandatory to remember the errors in c++ for running the program again carefully? Please give me some suggestion about it.

Answer 1

When learning to hammer nails into timber, you WILL hit your thumb a few times.
Knowing that this is a painful experience, you will be more likely to change your technique until practice gives you a pain free experience.
Coding is pretty much the same, only without the bleeding

Answer 2

You should know enough to find the root cause of the error, most of the time it can be found out simply by reading the error message carefully or Google searching it.