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Functions can be described as a module or a block of program code for executing a task. It is simple way of isolating one block of code from other blocks of code. Functions can be either built-in functions or are created to perform any task. They can be executed any number of times and it break a complex program into logical parts thereby saving a great deal of space and makes the program readable.


Functions require a prototype and it is this prototype gives a basic structural information that it tells the compiler what the function return after execution, details of the functions such as calling of the function as well as the arguments that are passed. The functions always returns a value. Usually the function declaration also called function signature does not have a body and it will be written at the top of the C source file or will be written in a separate header file. The function declaration will be as follows


Return-type function_name ( data type arg 1, ….. data type arg N);


Data type means the data type of each argument such as int, float, double or char. Usually the variable is being declared there. When the function is defined within the body of the program then it is called function definition and it is this portion of the program where the logic is implemented.


If no arguments are passed, then the parentheses are empty or more than one argument is passed. It is not particular that the function must return a value and if the function does not return anything then the return type is void. While defining the function, it must begin with a prototype, minus the semi colon. The code that the function has to execute must be a block within the curly braces. The arguments that are passed to the function can be used if they were declared in the block. If the prototype is present, a function can be used even though there is no definition. If the keyword return is used, then it will force the function to return a value. It is also possible to have a function that returns no value.


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