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Learn C Programming

You're reading from   Learn C Programming A beginner's guide to learning C programming the easy and disciplined way

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Product type Paperback
Published in Jun 2020
Publisher Packt
ISBN-13 9781789349917
Length 646 pages
Edition 1st Edition
Languages
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Author (1):
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Jeff Szuhay Jeff Szuhay
Author Profile Icon Jeff Szuhay
Jeff Szuhay
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Table of Contents (33) Chapters Close

Preface 1. Section 1: C Fundamentals
2. Running Hello, World! FREE CHAPTER 3. Understanding Program Structure 4. Working with Basic Data Types 5. Using Variables and Assignment 6. Exploring Operators and Expressions 7. Exploring Conditional Program Flow 8. Exploring Loops and Iteration 9. Creating and Using Enumerations 10. Section 2: Complex Data Types
11. Creating and Using Structures 12. Creating Custom Data Types with typedef 13. Working with Arrays 14. Working with Multi-Dimensional Arrays 15. Using Pointers 16. Understanding Arrays and Pointers 17. Working with Strings 18. Creating and Using More Complex Structures 19. Section 3: Memory Manipulation
20. Understanding Memory Allocation and Lifetime 21. Using Dynamic Memory Allocation 22. Section 4: Input and Output
23. Exploring Formatted Output 24. Getting Input from the Command Line 25. Exploring Formatted Input 26. Working with Files 27. Using File Input and File Output 28. Section 5: Building Blocks for Larger Programs
29. Working with Multi-File Programs 30. Understanding Scope 31. Other Books You May Enjoy Appendix

Understanding unconditional branching – the dos and (mostly) don'ts of goto

The goto statement is an immediate and unconditional transfer of program execution to the specified label within a function block. goto causes execution to jump to the label. In current C, unlike the bad old days, goto may not jump out of a function block, and so it may neither jump out of one function into the middle of another nor out of one program into another program (neither were uncommon in those days).

The goto statement consists of two parts. First, there must be a label declared either as a standalone statement, as follows—label_identifier :—or as a prefix to any other statement, like so: label_identifier : statement.

And secondly, there must be the gotostatement to that label_identifier. The syntax for the goto statement is as follows:

goto label_identifier;

The reason for thegoto statement being shunned comes from the bad old days...

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