Understanding Validation


  • Validation is a process in programming to ensure that the data input to a program is correct, that it is of the right type, and is within the acceptable range.
  • Ensuring data validity maintains the reliability, consistency and security of the system.

Purpose of Validation

  • Validation catches mistakes early and prevents further processing of incorrect data.
  • It reduces the chance of program failure, logical errors or system vulnerability.

Common Validation Techniques

  • Range check validation: Ensures input falls within a specific range.
  • Type check validation: Verifies that the right datatype has been entered.
  • Format check validation: Certifies that the input matches a specified pattern.
  • Presence check validation: Assures that an essential field has not been left blank.
  • Length Check Validation: Guarantees that the input is of the correct length.

Exceptions and Error Handling

  • The validation process should also include exception and error handling.
  • When invalid data is detected, an error message should be generated to guide the user to enter valid data.
  • Exception handling is used to manage the execution of a program when an error occurs during the execution of a program.

Key Takeaway

  • Validation is an essential aspect of programming which helps to prevent the input of incorrect data. Implementing various validation techniques ensures that data is accurate, reliable, and secure, leading to a robust and efficient program.