Introduction
A C++ function is a series of statements that have been grouped. A function can be called from another part of the program to act. Parameters are variables that are passed into the function, allowing the programmer to control the data being processed by the function—the article: C++ Function Parameters Easy Way will show how to deal with C++ function parameters.
What is a Function?
A function is a block of code that performs a specific task. Functions are often used to create modular code and can be reused in other parts of the program.Functions are also called procedures or subroutines.You can think about functions as a set of instructions for carrying out an operation, such as adding two numbers together.
C++ Function Parameters
Parameters are values passed to a function when the function is called. Parameters can be either inputs or outputs. Input parameters are values that the user passes to the function when they call it, while output parameters contain values returned from the function after it has been executed.
When do C++ function parameters intervene?
Concept clarification
At the outset, note that parameters can be required or optional. If They are needed, Function parameters intervene in the following cases function parameters intervene in the following cases
- When we call a C++ function
- In the function definition.
- If we want to have a more readable and maintainable code.
Example for clarification
The code of the program
#include <iostream>using namespace std;double multiplication_numbers(double, double);double multiplication {0};int main(){multiplication = multiplication_numbers (5.12 , 13.25);cout<<multiplication<<endl;return 0;}double multiplication_numbers( double x, double y){return x *y;}
Console Output
C++ pass by value
Concept clarification
The C++ programming language provides a mechanism for passing values to functions. This can be done by either passing the address of the value or by passing a copy of the value.Pass by value is an approach to passing parameters to functions in which copies of the arguments are made and given to the function. The original values in the calling function are not changed but can be accessed in the called function.
Example for clarification
The code of the program
#include <iostream>using namespace std;void parameter_recognition(int x){// x is a copy of differentx = 100; // parameter_recognition does not change the value in int //different}int main(){int different{50};parameter_recognition(different);cout<<different<<endl;return 0;}
Console Output
Function return statement
A function return statement specifies the value a function will return when it is called. If a function does not have a return statement, it will simply return the values of the last command executed in its body.The return value can be either an expression (such as a number) or nothing.
A function can return a value.
The function will return the result of the last statement in the function.
A function does not return a value.
void function is a function that does not return anything. This means that it is not necessary to provide an output variable in the function declaration.
Multiple return statements
The function can have more than one return statement. If there are multiple return statements, the last one is used. Each return statement must have a different type of data and a different number of arguments. As programmers, we should avoid many return statements in the same function.
Conclusion
Passing by value means that the compiler copies the value of an argument in a calling of a C++ function.
