Web Reference: 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. 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. Before going ahead to learn about local and global variable scope, let's understand what scopemeans. This means that the scope of a variable is the block of code in the entire program where the variable is declared, used, and can be modified. In the next section, you'll learn about local scope of variables
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