Invalid Operations

Learn about invalid operations with pointers.


There are a few operations that are invalid and don’t make sense on pointers:

  • ​​Multiplication and division between pointer and number or pointer and pointer.
  • Addition of two pointers.
  • Subtraction between two pointers of different types.

These operations are not allowed because they don’t make sense.


Adding a constant value to a pointer makes sense because we know that we move x bytes to the right. Multiplying does not make sense because the result is undefined. Depending on the address, we end up in a different memory location. We can’t say that the resulting memory location is always x bytes to the right.

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