It is a good idea to avoid overly long lines in the source code, because they need to be scrolled to read, and may not fit within the margins of your co-developers’ text editors. If the lines are too long, you should break them or reformat them (for example, by adding a newline before or after an operator), and by breaking long string constants into several lines using the string concatenation operator - ..

Many coding standards require lines to fit within 80 characters or 78 characters or so, and you should standardise on a similar limit for your own code.