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1. Dev C++ Call Function Number
2. C++ Call Function From Another Function
3. Functions In Dev C++
4. Dev C Call Function On Within Function
5. How To Call A Function In Dev C++
6. C++ Calling Functions Within Functions

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In C++, you can exit a program in these ways:

• Call the exit function.
• Call the abort function.
• Execute a return statement from main.

exit function

The exit function, declared in <stdlib.h>, terminates a C++ program. The value supplied as an argument to exit is returned to the operating system as the program's return code or exit code. By convention, a return code of zero means that the program completed successfully. You can use the constants EXIT_FAILURE and EXIT_SUCCESS, also defined in <stdlib.h>, to indicate success or failure of your program. Roland 303 vst download.

Issuing a return statement from the main function is equivalent to calling the exit function with the return value as its argument.

abort function

The abort function, also declared in the standard include file <stdlib.h>, terminates a C++ program. The difference between exit and abort is that exit allows the C++ run-time termination processing to take place (global object destructors will be called), whereas abort terminates the program immediately. The abort function bypasses the normal destruction process for initialized global static objects. It also bypasses any special processing that was specified using the atexit function.

atexit function

Use the atexit function to specify actions that execute prior to program termination. No global static objects initialized prior to the call to atexit are destroyed prior to execution of the exit-processing function.

return statement in main

Issuing a return statement from main is functionally equivalent to calling the exit function. Consider the following example:

The exit and return statements in the preceding example are functionally identical. However, C++ requires that functions that have return types other than void return a value. The return statement allows you to return a value from main.

Destruction of static objects

When you call exit or execute a return statement from main, static objects are destroyed in the reverse order of their initialization (after the call to atexit if one exists). The following example shows how such initialization and cleanup works.

Example

In the following example, the static objects sd1 and sd2 are created and initialized before entry to main. After this program terminates using the return statement, first sd2 is destroyed and then sd1. The destructor for the ShowData class closes the files associated with these static objects.

Another way to write this code is to declare the ShowData objects with block scope, allowing them to be destroyed when they go out of scope:

See also

• C Programming Tutorial
• C Programming useful Resources

• Selected Reading

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.

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 −

Dev C++ Call Function Number

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.

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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.

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.

C++ Call Function From Another Function

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

Functions In Dev C++

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.

Dev C Call Function On Within Function

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

How To Call A Function In Dev C++

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

C++ Calling Functions Within Functions

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.