World of typos and copy-paste

Programmers make an incredible amount of typos, simple logical blunders and make mistakes thanks to Copy-Paste. I invite you to try them out. Enjoy your meal.

Programmers often think that mistakes that take the most time are very complex and insidious. And they do not make simple mistakes.

This is certainly not the case. They do, and in sum, spend a huge amount of time and effort on correcting them. Just minor mistakes are not remembered. Much better remember the epic battle with a synchronization error that took a whole day. Yes, complex errors can also take a lot of time. The main thing is that the total harm from minor errors can also be huge. This idea is described in more detail in the note: The second myth - professional developers do not allow stupid mistakes .

Checking various projects with the help of PVS-Studio, I replenish the database of errors found. Now I have chosen those diagnostic messages that reveal: bloopers , typos and incorrect Copy-Paste . Read and be terrified:

• V501. Copy-Paste and typos in the conditions .
• V502. Confusion with priorities of operations .
• V517. Same “if” due to Copy-Paste .
• V519. Harmful typos .
• V523. Meaningless "if" due to copied blocks .
• V524. Functions made using Copy-Paste .
• V529. Extra semicolons ";" .
• V547. Stupid errors, such as checking: unsigned variable <0 .
• V560. Confusing & and && is easy .
• V579. How to easily confuse the length of the string and the size of the pointer .
• V595. Check pointers made "for show" .

This is not all stupid mistakes, but the most revealing. I wish you a pleasant viewing. The entire list of examples is here .