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⚡ Technology·2 min·Updated Mar 9, 2026

What is Runtime Error?

Runtime Error

Quick Answer

A runtime error is a type of error that occurs while a program is running, causing it to stop unexpectedly. These errors happen when the code is executed, often due to issues like invalid input or resource unavailability.

Overview

A runtime error occurs when a program is executing, and it encounters an issue that prevents it from continuing. This type of error can arise from various situations, such as trying to divide by zero, accessing a file that doesn't exist, or running out of memory. Unlike syntax errors, which are caught before the program runs, runtime errors happen while the program is in action, making them sometimes harder to diagnose and fix. Understanding runtime errors is crucial for software developers because they can significantly affect the user experience. For instance, if a mobile app crashes due to a runtime error, it can frustrate users and lead to negative reviews. Developers often use debugging tools to identify and resolve these errors, ensuring that the software runs smoothly and reliably. A real-world example of a runtime error is when a user inputs a non-numeric value into a calculator application that expects numbers. The application might crash or display an error message if it attempts to perform a calculation with that invalid input. This highlights the importance of validating user inputs and handling errors gracefully in software development.

Frequently Asked Questions

A runtime error can be caused by various factors, including invalid user input, resource limitations, or logical errors in the code. It occurs when the program encounters a situation it cannot handle during execution.
Developers can fix runtime errors by using debugging tools to identify where the error occurs in the code. They may also implement error handling techniques to manage unexpected situations and ensure the program can recover gracefully.
While runtime errors can lead to program crashes, they are not always the same. A runtime error may occur without crashing the program if the error is handled properly, allowing the program to continue running or provide a useful error message.