How do I use pointers in C++?

How do I use pointers in C++?

Pointers in C++ are variables that store the memory address of another variable. You can declare a pointer using the '*' symbol.

Can you show me an example of declaring and using a pointer?

Sure! Here's a simple example:

int main() {
    int var = 20;  // Declare an integer variable
    int *ptr;     // Declare a pointer variable
    ptr = &var;   // Store the address of var in ptr

    // Output the value of var using the pointer
    std::cout << "Value of var: " << *ptr << std::endl;
    return 0;
}

What happens if I try to dereference a null pointer?

Dereferencing a null pointer leads to undefined behavior, which often results in a program crash or segmentation fault.

How can I avoid memory leaks when using pointers?

To avoid memory leaks, always ensure that you delete any dynamically allocated memory using delete or delete[] when it's no longer needed.