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Applications of Pointer in Earth Sciences Programming

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  1. Chapter 8 Pointers Applications of Computer Programming in Earth Sciences Instructor: Dr. Cheng-Chien Liu Department of Earth Sciences National Cheng Kung University Last updated: 2 November 2004

  2. Introduction • Pointer • A variable that holds a memory address • Ex 8-1 • “Address of” operator & • Convention of naming • Declaration • Indirection (dereference) operator * • 提領（取出指標所指物體的內容） • The value stored at … • Initialization • Wild pointer  dangerous • Pointers  addresses  variables • Manipulating data: Ex 8-2 • Examining the address: Ex 8-3

  3. Why use pointers • Three tasks of using pointers • Managing data on the free store • Accessing class member data and functions • Passing variables by reference to functions • Five areas of memory • Global name space  global variables • The free store  heap  all remaining memory • Registers  internal housekeeping • Code space  code • The stack  local variables, function parameters • Concept of free store

  4. Using free store • Advantages of free store • Solves the problem of global and local variable • Remains available until you explicitly free it • Only functions with access to the pointer  tightly controlled interface • How to use the free store • new • delete • Ex 8-4 • Ex 8-5: applying to object • Memory leak

  5. Using free store (cont.) • Access member data of objects • dot operator “.” • points-to operator “->” • Ex 8-6 • Ex 8-7 • Stray pointers • Ex 8-9 • const pointers • Ex 8-10

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