Dev C++ Call Function

A function is a block of code which only runs when it is called.

You can pass data, known as parameters, into a function.

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  • C handles passing an array to a function in this way to save memory and time. Passing Multidimensional Array to a Function Multidimensional array can be passed in similar way as one-dimensional array.
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  • Nov 13, 2014  Similarly, you should do like this for your next void functions when calling. Beside, notice about the variables, whether using value variable or reference variable. In this case, if you want to print the value of x, y, z after executing the above void function, you should declare like this: void intialize(int& x.

Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times.

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Create a Function

C++ provides some pre-defined functions, such as main(), which is used to execute code. But you can also create your own functions to perform certain actions.

To create (often referred to as declare) a function, specify the name of the function, followed by parentheses ():

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Syntax

Example Explained

  • myFunction() is the name of the function
  • void means that the function does not have a return value. You will learn more about return values later in the next chapter
  • inside the function (the body), add code that defines what the function should do

Call a Function

Declared functions are not executed immediately. They are 'saved for later use', and will be executed later, when they are called.

To call a function, write the function's name followed by two parentheses () and a semicolon ;

In the following example, myFunction() is used to print a text (the action), when it is called:

Example

Inside main, call myFunction():

Dev C++ Call Function
// Create a function
void myFunction() {
cout << 'I just got executed!';
}
int main() {
myFunction(); // call the function
return 0;
}
// Outputs 'I just got executed!'
Run example »

A function can be called multiple times:

Dev C++ Calling Function

Example

C++ Function Call By Reference

void myFunction() {
cout << 'I just got executed!n';
}
int main() {
myFunction();
myFunction();
myFunction();
return 0;
}
// I just got executed!
// I just got executed!
// I just got executed!
Run example »

Function Declaration and Definition

A C++ function consist of two parts:

Function In Dev C++

  • Declaration: the function's name, return type, and parameters (if any)
  • Definition: the body of the function (code to be executed)

C++ Function Call Operator

void myFunction() { // declaration
// the body of the function (definition)
}

Note: If a user-defined function, such as myFunction() is declared after the main() function, an error will occur. It is because C++ works from top to bottom; which means that if the function is not declared above main(), the program is unaware of it:

Example

int main() {
myFunction();
return 0;
}
void myFunction() {
cout << 'I just got executed!';
}
// Error
Run example »

Dev C++ Programs

However, it is possible to separate the declaration and the definition of the function - for code optimization.

You will often see C++ programs that have function declaration above main(), and function definition below main(). This will make the code better organized and easier to read:

Example

C call function from dll

Dev C Call Function N By Name

// Function declaration
void myFunction();
// The main method
int main() {
myFunction(); // call the function
return 0;
}
// Function definition
void myFunction() {
cout << 'I just got executed!';
}

C# Call Method

Run example »
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