Errors and debugging

1. Errors and debugging

2. Introduction • Even the best coders make mistakes. In this presentation you will see what the main errors in Java are and how to solve them. • There will be a few short videos to demonstrate some of the ideas.

3. What is an error? • When your code does some thing that was unexpected this is known as a error. • If your code does not compile then the problems are also classed as errors. • Errors can be split into three main types - • Syntax errors • Logic errors • Run time errors

4. Syntax errors • A syntax error occurs when you make grammatical errors in your source code. • This is commonly typing mistakes or forgetting to balance your brackets. • If code has a syntax error in it then it will not compile.

5. Retake code • The code is a direct representation of the tree - • if (mark<50){ if (exams<4){ • System.out.println(“Do retake now”); } else { • System.out.println(“Do retake later”); } • } else { • System.out.println(“No retake”); • }