17 Common C++ Programming Errors and Their Solutions

Introduction

Many programmers must have had similar experiences: after working hard to finish the project code, they are full of confidence in the quality of the work. However, when the static application security testing tool appears, it reveals many hidden warning issues. In order to make my programming journey smoother and continuously improve my skills, I would like to take this opportunity to summarize and share those programming details that are often overlooked but lead to warnings, as a self-warning and improvement for the future.

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1. Null pointer dereference

Error example:

int* ptr = nullptr;
std::cout << *ptr;  // 解引用空指针，可能导致段错误

Solution: Always check if the pointer is empty before accessing it.

if (ptr != nullptr) {
    std::cout << *ptr;
}

2. Multi-thread race condition

Error example: Multiple threads simultaneously read and write the same data without locking protection.

int shared_var = 0;void thread_func() {
    for (int i =…