Lecture introduction to computer programming chapter 9 file processing

Chapter 9 File Processing 2017 – 2018, Semester 2 Ho Chi Minh City University of Technology Faculty of Computer Science and Engineering Introduction to Computer Programming (C language) TS Võ Thị Ngọc[.]

Chapter 9: File Processing

Introduction to Computer Programming

(C language)

TS Võ Thị Ngọc Châu (chauvtn@cse.hcmut.edu.vn,

chauvtn@hcmut.edu.vn)

Course Content

Programming

Components

References

Deitel and Harvey Deitel, Prentice Hall, 2012

– Brian W Kernighan and Dennis M Ritchie, Prentice Hall, 1988

4

Content

 Introduction

 Declare files

 Open and close files

 Store and retrieve data from files

 Use macros

 Summary

Recall – Chapter 3 and Chapter 8

Uninitialized data

.bss

Initialized data

.data

Code

.text

Stack

Heap

Read from program file

by exec

Initialized to

zero by exec

Command-line arguments

and environment variables

Higher address

Lower address

Local variables, arguments,

grown/shrunk with function calls

Grown/shrunk with dynamic

allocation and de-allocation

Uninitialized (static) global

variables, static local variables

Initialized (static) global variables,

static local variables, constants

Machine code, often read-only

Introduction

 Temporary as lost when a program terminates !!!

after program execution?

drives, CDs, DVDs, flash drives, …)

6

Introduction

Files on hard drives

data1.txt data2.txt

…

Introduction

8

Figure 11.1 Data hierarchy

[1], pp 419

Introduction

a specific byte number recorded in a

system-maintained, administrative data structure

file

files and programs

Figure 11.2 C’s view of a file of n bytes

Introduction

bytes

beginning of the file

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Figure 11.10: C’s view of a random-access file

[1], pp 431