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. There are three places where variables can be declared in C programming language −. Inside a function or a block which is called local variables. Outside of all functions which is called global variables. In the definition of function parameters which are called formal parameters.
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