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C++ Pointers and References

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Introduction to Pointer Arithmetic

Moving Pointers

You can use arithmetic operators like addition (+) and subtraction (-) with pointers to navigate through memory locations. When a pointer is pointing to an int, increasing its value will move it forward by the size of an integer.

The size of the data type to which the pointer points determines the step size of the arithmetic operation. You can experiment with different data types.

main.cpp

main.cpp

copy
#include <iostream>

int main()
{
int variable = 10;
int *pointer = &variable;

std::cout << pointer << std::endl;
std::cout << pointer + 1 << std::endl;
}

              
12345678910

            
#include <iostream>

int main() 
{
    int variable = 10;
    int *pointer = &variable;

    std::cout << pointer << std::endl;
    std::cout << pointer + 1 << std::endl;
}

Pitfalls and Memory Safety

Performing multiplication or division directly on pointers will result in an error. Additionally, using float numbers with pointers is generally not meaningful and can lead to unexpected behavior.

Note

Accessing memory beyond the allocated bounds, often due to incorrect pointer arithmetic, can lead to serious issues such as crashes and security vulnerabilities.

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What is the purpose of using arithmetic operators with pointers?

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