fiunction in c++

Here is an example of a function in C++ along with explanations for each step:

#include <iostream>

// Function declaration
int addNumbers(int a, int b);

int main() {
    // Function call
    int result = addNumbers(5, 3);
    std::cout << "The result is: " << result << std::endl;

    return 0;
}

// Function definition
int addNumbers(int a, int b) {
    int sum = a + b;
    return sum;
}

Explanation:

1. The #include <iostream> statement allows us to use the input/output stream functionality in C++, which includes the std::cout and std::endl statements.

2. The int addNumbers(int a, int b); statement is the function declaration. It tells the compiler that we will define a function named addNumbers that takes two integer parameters a and b and returns an integer value.

3. The int main() function is the entry point of our program. It is where the program execution begins.

4. The int result = addNumbers(5, 3); statement is the function call. It calls the addNumbers function and passes the values 5 and 3 as arguments.

5. The std::cout << "The result is: " << result << std::endl; statement prints the result of the addNumbers function to the console. The std::cout is used to output text, and the << operator is used to concatenate and display multiple values.

6. The return 0; statement in the main function indicates that the program has finished executing successfully.

7. The int addNumbers(int a, int b) { ... } statement is the function definition. It defines the implementation of the addNumbers function. Inside the function, we declare a variable sum and assign it the value of a + b. Finally, we return the value of sum.