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C Structure and Function. In this article, you'll find relevant examples to pass structures as an argument to a function, and use them in your program. Structure variables can be passed to a function and returned in a similar way as normal arguments. A structure variable can be passed to a function in similar way as normal argument. Our function's name is also a little bit misleading as the function doesn't actually add two integers, it outputs the addition of two integers. To fix this, let's just change the function type and use return. Since the addition of two integers should always result in an integer, we can use the int function type. registercallback is wapper of registercallback to call cbproxy. Waitevent will invoke callback internally with taking argument userdata. Userdata should be passed from main. However, one another issue you meet. Rules for passing pointers between Go and C. Unfortunately again, Go can't pass pointer which is allocated in Go into C function.

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Description

The C library function void exit(int status) terminates the calling process immediately. Any open file descriptors belonging to the process are closed and any children of the process are inherited by process 1, init, and the process parent is sent a SIGCHLD signal.

Declaration

Following is the declaration for exit() function.

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Parameters

• status − This is the status value returned to the parent process.

Return Value

This function does not return any value.

Example

The following example shows the usage of exit() function.

Let us compile and run the above program that will produce the following result −

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A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions.

You can divide up your code into separate functions. How you divide up your code among different functions is up to you, but logically the division is such that each function performs a specific 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. For example, strcat() to concatenate two strings, memcpy() to copy one memory location to another location, and many more functions.

Function In Dev C++

A function can also be referred as a method or a sub-routine or a procedure, etc.

Defining a Function

The general form of a function definition in C programming language is as follows −

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.

Example

Given below is the source code for a function called max(). This function takes two parameters num1 and num2 and returns the maximum value between the two −

Function Declarations

A function declaration tells the compiler about a function name and how to call the function. The actual body of the function can be defined separately.

A function declaration has the following parts −

For the above defined function max(), the function declaration is as follows −

Parameter names are not important in function declaration only their type is required, so the following is also a valid declaration −

Function declaration is required when you define a function in one source file and you call that function in another file. In such case, you should declare the function at the top of the file calling the function.

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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. For example −

We have kept max() along with main() and compiled the source code. While running the final executable, it would produce the following result −

Function Arguments

If a function is to use arguments, it must declare variables that accept the values of the arguments. These variables are called the formal parameters of the function.

Formal parameters behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit.

Dev C++ Call Function List

While calling a function, there are two ways in which arguments can be passed to a function −

Dev C Call Function N By Name

By default, C uses call by value to pass arguments. In general, it means the code within a function cannot alter the arguments used to call the function.