Function in c programming bangla tutorial All in one in function

Описание: Today's topic is Function.. A very interesting topic. Don't be afraid of this topic please. I tried my best to make it easier as much as i can but still if you feel problem then knock me at email.My email id : [email protected] let's start.

A function is a group of statements that together perform a task. ... A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function. The C standard library provides numerous built-in functions that your program can call.

Defining a Function:

The general form of a function definition in C programming language is as follows −)
return_type function_name( parameter list ) // prototype
{ body of the function }
For example
y = f(x)
fruit_juice blender(fruit)

A function definition in C programming consists of a function header and a function body. Here are all the parts of a function :

Return Type :
A function may return a value. The return_type is the data type of the value the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the keyword void.

Function Name :
This is the actual name of the function. The function name and the parameter list together constitute the function signature.

Parameters :
A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters.

Function Body :
The function body contains a collection of statements that define what the function does.

Calling a Function
While creating a C function, you give a definition of what the function has to do. To use a function, you will have to call that function to perform the defined task.
When a program calls a function, the program control is transferred to the called function. A called function performs a defined task and when its return statement is executed or when its function-ending closing brace is reached, it returns the program control back to the main program.
To call a function, you simply need to pass the required parameters along with the function name, and if the function returns a value, then you can store the returned value. 

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