I understand your concern. In older-style programming languages (like BASIC), line numbers are crucial for execution order. While you are using 10, 20, 30 (which should normally be fine), some interpreters or environments require a larger spacing to avoid conflicts—especially if you later insert additional lines between them. That’s why you’re seeing the error: "Line numbers are too close together."
If you had used 1, 2, 3, older compilers would often still run the program, but you would have no room to insert lines between them (like 15 between 10 and 20). Modern interpreters enforce spacing rules more strictly to ensure maintainability.
✅ What you can do:
Try renumbering your program with a bigger gap (like 100, 200, 300).
Use the built-in RENUMBER command if your environment supports it.
Consider rewriting the program without line numbers, since most modern BASIC variants don’t require them.
If you’d like expert guidance in debugging or converting your old-style programs into updated versions, you can connect with tutors at Expertsmind for step-by-step help.