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Introduction to C Programming and Working with TAs in CSE 333

This document serves as an introduction to working with your teaching assistants (TAs) in CSE 333. It outlines key points about communication, including the importance of using the staff email and engaging with the discussion board for questions and concerns. A brief overview of the C programming language is provided, covering topics such as pointer arithmetic, memory management, and the concept of pass-by-value. Additionally, it discusses the use of function pointers and debugging techniques with gdb, encouraging students to utilize man pages for documentation lookup.

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Introduction to C Programming and Working with TAs in CSE 333

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  1. CSE 333 – SECTION 1 C, Introduction to and Working with

  2. Your TAs • RenshuGu – PhD Student, EE • Johnny Yan – PhD Student, CSE • Cortney Corbin – Undergrad, CSE • Sunjay Cauligi – Undergrad, CSE • Email are posted on the course website • But try to use the staff email instead of our individual emails • Office hours will be posted soon • Please use the discussion board!

  3. Questions, Comments, Concerns • Do you have any? • Exercises going ok? • Lectures make sense?

  4. Quick Refresher on C • General purpose programming language • Procedural • Often used in low-level system programming • Supports use of pointer arithmetic • Provides facilities for managing memory • C passes all of its arguments by value • Pass-by-reference is simulated by passing the address of a variable

  5. Pointers • A data type that stores an address • Used to indirectly refer to values • Can add/subtract to the address • It’s just another number Address p a Value Address

  6. Arrays and pointers • a[0] <==> *a • a[3] <==> *(a + 3) • How about a, a+3, • *a+3 or *a++?

  7. Example [basic_pointer.c] #include <stdio.h> void f(int *j) { (*j)++; } intmain() { inti = 20; int *p = &i; f(p); printf("i = %d\n",i); return 0; }

  8. Pointers to pointers char *c = “hello”; char **cp= &c; char ***cpp= &cp; • Why could this be useful?

  9. Function pointers • We can have pointers to functions as well • Syntax is a little awkward • Example: int(*ptr_to_int_fn)(int, int) • Makes sense if you think about it hard • We will be using these in the homework assignments! • Demo: [function_pointer.c]

  10. Debugging with gdb • Just like in CSE 351, gdb is your friend • Unlike CSE 351, we will be debugging C/C++ code, not assembly • Instead of n(ext)i and s(tep)i, use n(ext) and s(tep) • Your first instinct for bug fixing should be gdb, not printf • Demo: [buggy.c]

  11. Looking up documentation • Don’t go straight to Google / Stack Overflow / etc. • Use the built-in man pages • man <program/utility/function> • man -f <name> or whatis <name> • apropos <keyword> • Much more documentation is linked on the 333 home page • Under “Resources” on the left side of the page

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