C in 21 Days: Week 3 covers the following topics:

Day 15: More on Pointers
Shows how to declare a pointer to a pointer. Demonstrates how to use pointers with multidimensional arrays. Explains how to declare arrays of pointers. Describes how to declare pointers to functions.

Day 16: Using Disk Files
Discusses relating streams to disk files. Identifies C's two disk file types. Shows how to open a file write data to a file read data from a file and close a file. Describes disk file management. Discusses using temporary files.

Day 17: Manipulating Strings
Covers how to determine the length of a string. Examines how to copy and join strings. Explores functions that compare strings. Shows how to search strings convert strings and test characters.

Day 18: Getting More from Functions
Describes using pointers as arguments to functions. Explains using type void pointers as arguments. Shows how to use functions with a variable number of arguments. Demonstrates how to return a pointer from a function.

Day 19: Exploring the Function Library
Demonstrates using the math time and error-handling functions. Examines functions for searching and sorting data.

Day 20: Odds and Ends
Discusses type conversions. Covers allocating and freeing memory storage. Shows how a program can use argc and argv[] to access DOS command-line arguments. Demonstrates how to manipulate the individual bits in integer variables using bitwise operators. Shows how to use bit fields in structures.

Day 21: Taking Advantage of Preprocessor Directives and More
Explains how to program with multiple source-code files. Demonstrates how to use preprocessor directives to create function macros for conditional compilation and other tasks.

Week 3 in Review
Presents a program that uses the skills learned during the week.

Reference
Provides reference tables for the ASCII character chart C reserved words and binary and hexadecimal notation. Lists example programs.  

This course has the following features:

	Exercises that allow users to practice writing and compiling C programs
	A file containing the text of the all exercises
	Answers to the exercises
	Sample program files for all program listings in the course
	A glossary
	A Skill Assessment

	C in 21 Days: Week 1 (CLGC01)
	C in 21 Days: Week 2 (CLGC02)

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Microsoft Visual C++® is a registered trademark of Microsoft Corporation.
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