List of articles

• 1 Introduction
• 2 User input illegal hazards
• • 2.1 Cause program interruption
  • 2.2 Hidden bug Bring project risks
  • • 2.2.1 King of glory bug
    • 2.2.2 Project practice summary
• 3 How to deal with illegal user input
• • 3.1 Exception capture mechanism
  • 3.2 Monitor according to the usage scenario and the type of input data
  • 3.3 Set up the correct input list for query

1 Introduction

I saw a question in today's blog comment ： How to deal with the problem that users input non numbers ？

In fact, this user seems to be just asking about the processing of non numeric strings , In fact, it inadvertently puts forward a kind of common problems in software interaction design , That is, how to deal with the problem of illegal user input .

My position on this issue is as follows ： This problem （ Illegal user input ） It is not an individual situational problem of a language , It's engineering or HMI A kind of problems that need to be paid attention to in design .

For the problem at that time &#x