Web Reference: Oct 17, 2025 · The scope of a variable in C is the block or the region in the program where a variable is declared, defined, and used. Outside this region, we cannot access the variable, and it is treated as an undeclared identifier. Sep 8, 2021 · In this tutorial, you'll learn about variable scope in the C programming language. You'll see some code examples to help you understand the differences between local and global variables. Scope Now that you understand how functions work, it is important to learn how variables act inside and outside of functions. In C, variables are only accessible inside the region they are created. This is called scope.
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