How is null used in C++?

6 months ago

1 minute

In C++, the nullptr keyword is commonly used to represent a null pointer instead of using NULL or 0. Introduced in C++11, nullptr is used to represent a null pointer or null address. It can be used in scenarios such as pointer initialization, conditional checks, function parameters, etc., to indicate the meaning of a null pointer.

“For all intents and purposes, the project is now complete.”

“In essence, the project is finished.”

int* ptr = nullptr; // 初始化一个空指针
if (ptr == nullptr) { // 检查指针是否为空
    // 执行相关操作
}

void func(int* ptr) {
    if (ptr == nullptr) {
        // 执行相关操作
    }
}

func(nullptr); // 调用函数时传递空指针