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Functions A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times. The function returns the sum of a and b, which is then stored in the variable c. How to Pass Parameters to a Function There are two methods of passing parameters (also called arguments) to a function in C: by value and by reference. When we pass a parameter by value, the method receives a copy of the parameter's value. C Functions help in the optimization and re-usability of Code. In this tutorial, learn about Definition, Declaration and Calling of C Function. Learn about functions in C, their types, and how they work. Explore examples and understand the importance of functions in C programming.
