Software Approach, Top Down Design

One way of coding is to simply have an rough idea of what you want to do and then start typing away to produce one huge source file.

This is a very bad idea.

The resulting code is likely to have many issues with it that include

• Poorly documented code, so very hard to maintain and update
• 'Spaghetti code' - which means a tangled mess of jumps and loops all over the code, very hard for someone to understand. Even by the original coder a few days later!
• Duplication of code, so wasting memory and running speed
• Very hard to develop by more than one person as there is only one file
• Very hard to debug - the file either works for it doesn't