After completing C in 21 Days: Week 3, the user should be able to:
 | Use pointers in more complex ways |
| Use disk files and perform file management functions |
| Use string manipulation, math, time, and error-handling functions |
| Get more from functions through the interaction of pointers and functions |
| Allocate, reallocate and free memory at runtime |
| Use type casts with variables and pointers |
| Access arguments passed to the program on the command line |
| Manipulate individual bits |
| Apply the principles of modular programming |
| Use preprocessor directives |
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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.
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