The non-return type functions do not return any value to the calling function; the type of such functions is void. Example without return value: If you want to return any value from the function, you need to use any data type such as int, long, char, etc. Suppose we have a simple function which accepts the integer values and stores in the array. But in the end, C is really passing the value of the pointers (and these values are copied in the execution context of the function just as any other "passing by value"); it just is that you can access the pointed values that are not in the execution context of the function so neither copied as call-time, nor erased at return-time. A return statement is used to end the execution of the function call and “returns” the result (value of the expression following the return keyword) to the caller. We know that a structures is user defined datatype in C that can hold several data types of the same or different kind.The idea is to create a struct containing all required data types as its members and return that struct from our function. For example, int add (int a, int b) { return (a + b); } Here, we have the data type int instead of void. Don’t stop learning now. Which approach is better? Continue on C – Variable length arguments…. Vector of Vectors in C++ STL with Examples, Asynchronous and Synchronous Callbacks in Java, SQL general functions | NVL, NVL2, DECODE, COALESCE, NULLIF, LNNVL and NANVL, Left Shift and Right Shift Operators in C/C++, Initialize a vector in C++ (5 different ways), Map in C++ Standard Template Library (STL), Write Interview How to pass a 2D array as a parameter in C? How to deallocate memory without using free() in C? All C functions can be called either with arguments or without arguments in a C program. Also, they may or may not return any values. Passing & Returning Structure from Function? If the passed argument is a non-prime number, the function returns 1. The return value is assigned to the flag variable. Functions that return values can be used in expressions, just like in math class. What is return type of getchar(), fgetc() and getc() ? C function without arguments (parameters) and with return value. Here are all the parts of a function − 1. We don’t have any control over the values of the variables a and b because they are fixed values. For example, if you use “return a,b,c” in your function, value for c only will be returned and values a, b won’t be returned to the program. C Function with argument and No Return value. Related: Lambda expressions in Python; The official documentation for function definition is: 4. These function may or may not return values to the calling functions. These values are copied to formal parameters “a” and “b” in swap function and used. Inside the C# function, the value to be returned is given by the expression in the return statement. C function with arguments (parameters) and with return value. If you try to return more than one values from a function, only one value will be returned that appears at the right most place of the return statement. The second form of the return statement is used to return values from a function. A few illustrations of such functions are given below. Return multiple value from function - using pointers. In this program, no values are passed to the function “test” and no values are returned from this function to main function. In this case, the return_type is the keyword void. The return type of the function is of type struct student which means it will return a value of type student structure. 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