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Solving the Constant Expression Required Error in C Programs

Discover how to resolve the frustrating "Constant Expression Required" error in C programming with simple solutions and best practices. --- This video is based on the question https://stackoverflow.com/q/64412505/ asked by the user 'Elixir_007' ( https://stackoverflow.com/u/14471943/ ) and on the answer https://stackoverflow.com/a/64412579/ provided by the user 'IrAM' ( https://stackoverflow.com/u/14471572/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Constant Expression Required in c Program Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding and Fixing the Constant Expression Required Error in C C programming can sometimes lead to confusing errors, especially for those just starting out. One such error is the famous "Constant Expression Required". If you've encountered this issue while coding, you’re not alone. Let’s dive into what this error means, why it happens, and how to resolve it effectively. What Does "Constant Expression Required" Mean? This error occurs when the compiler expects a constant value for certain variable declarations, specifically for array sizes or dimensions, but instead it receives a variable or non-constant expression. In simpler terms, C requires arrays to have specific sizes that don't change, and they must be defined using constant values known at compile-time. Example of the Error Consider this snippet from a C program: [[See Video to Reveal this Text or Code Snippet]] In this case, both n and m need to be constant expressions for the program to compile successfully. Since they’re likely determined at runtime, the compiler throws the "Constant Expression Required" error. How to Fix the Error Step 1: Use # define for Constants Instead of relying on dynamic variables for your array sizes, use the preprocessor directive # define to create constant values. Here's how you can do this: [[See Video to Reveal this Text or Code Snippet]] This allows you to define constants that will not change throughout the program and will be recognized by the compiler. Step 2: Correctly Read Input into Arrays Another common mistake that could be causing issues in your code is the way you’re reading input into an array. This line: [[See Video to Reveal this Text or Code Snippet]] should actually be: [[See Video to Reveal this Text or Code Snippet]] By adding the ampersand &, you ensure that you're passing the address of the element in the array where the input value should be stored. This is crucial because scanf requires a pointer to the variable where it will store the read value. Updated Example Here’s an updated version of your example code considering both fixes: [[See Video to Reveal this Text or Code Snippet]] Conclusion Fixing the "Constant Expression Required" error in C is straightforward once you understand the need for constant values in array definitions and how to properly read input. Following the outlined steps and recommendations will help ensure your program compiles and runs smoothly. Happy coding!