In C, what is the meaning of following function prototype with empty parameter listvoid fun(){   /* .... */}Question 2Answera.Function can only be called without any parameterb.Function can be called with any number of parameters of any typesc.Function can be called with any number of integer parameters.d.Function can be called with one integer parameter.

What is the purpose of a function prototype?To define the functionTo declare the function and specify its return type and parametersTo call the functionTo allocate memory for the function

Question 7Which code correctly calls a function, given a function pointer variable, fptr, that has no parameters and is type void?1 point*fptr = 2;2 = *(fptr & 0x2);(*fptr)();(fptr)(*);fptr();

What does void key word indicated in C function declaration?Question 3Answera.Integer returnb.Empty return typec.String returnd.Floating-point returnClear my choice

What does the following C-statement declare?int ( * f) (int * ) ;a.A function that takes an integer pointer as argument and returns a function pointerb.A pointer to a function that takes an integer pointer as argument and returns an integer.c.A function that takes an integer pointer as argument and returns an integerd.A function that takes an integer as argument and returns an integer pointer

In this challenge, you will learn simple usage of functions in C. Functions are a bunch of statements grouped together. A function is provided with zero or more arguments, and it executes the statements on it. Based on the return type, it either returns nothing (void) or something.A sample syntax for a function is return_type function_name(arg_type_1 arg_1, arg_type_2 arg_2, ...) { ... ... ... [if return_type is non void] return something of type `return_type`; }For example, a function to read four variables and return the sum of them can be written as int sum_of_four(int a, int b, int c, int d) { int sum = 0; sum += a; sum += b; sum += c; sum += d; return sum; }+= : Add and assignment operator. It adds the right operand to the left operand and assigns the result to the left operand.a += b is equivalent to a = a + b;TaskWrite a function int max_of_four(int a, int b, int c, int d) which reads four arguments and returns the greatest of them.NoteThere is not built in max function in C. Code that will be reused is often put in a separate function, e.g. int max(x, y) that returns the greater of the two values.Input FormatInput will contain four integers - , one on each line.Output FormatPrint the greatest of the four integers.Note: I/O will be automatically handled.Sample Input3465Sample Output6