C series for 1st sem students: Pointers in function calls

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C is a procedural language, which means it follows a series of steps/procedures in a systematic order to solve a problem. These procedures are often organized in functions. These functions take in some value(s) as argument(s), operate on them and return an output. But apart from this approach, a function can even change the state of other variables in the global scope, perform input/output operations etc.