Common Rookie Mistakes Every Programmer Should Avoid

As programmers, we all start as beginners and inevitably make silly mistakes that become valuable learning milestones.

Include Local File

include "d:\xxxxxxxxxxx.h"

Running code locally works fine, but after sharing it, the include path often breaks.

Guarantees personal indispensability.

No one else can run it.

Everyone has a D: drive, right?

Using Obscure Characters

The Chinese character "丨" looks like the vertical bar "|" in English.

丨 (Chinese character gǔn) I (uppercase i) l (lowercase L) ｜ (full‑width separator) | (half‑width separator) Ⅰ (Roman numeral one)

Using it as a string delimiter once caused a colleague to spend an entire afternoon debugging.

if‑else Explosion

Chaining dozens of if‑else statements leads to poor performance and tedious maintenance.

Meaningless Variable Names

int x,y,z,w,v,u,l,m,n,o,p,q,r,s,a1,b1;

Months later, it's impossible to recall the purpose of these variables.

Hard‑Coded Output

Instead of calculating output, some developers directly print fixed strings, which can also affect security when used for passwords.

Thread Waiting

QThread::sleep(1000); // sleeps for 1000 seconds

Misunderstanding the unit (seconds vs. milliseconds) can cause excessive delays.

Later, someone suggested using 999 seconds.

Variable Name and Meaning Mismatch

Comments suggest these are used to test color blindness or stem from misunderstanding naming conventions.

Missing Return Statement

Forgetting to add a return caused a function to return null, leading to hours of debugging.

These examples illustrate that embracing our mistakes helps us grow into better programmers.