Built-in Functions vs. User-Defined Functions

Most programming languages come with a library of built-in functions, which perform common tasks. For example, mathematical operations, string manipulation, and input/output processing.

Built-in Functions: Built-in functions are provided by the C++ standard library and are readily available for use without requiring additional declarations

C++

#include <iostream>
#include <cmath>
using namespace std;

int main() {
    // Built-in functions
    double squareRootResult = sqrt(25.0);
    cout << "Square Root: " << squareRootResult << endl;

    return 0;
}

Java

import java.lang.Math;

public class Main {
    public static void main(String[] args) {
        // Built-in functions
        double squareRootResult = Math.sqrt(25.0);
        System.out.println("Square Root: " + squareRootResult);
    }
}

JavaScript

// Using built-in Math.sqrt() function to calculate square root
const squareRootResult = Math.sqrt(25.0);
console.log("Square Root:", squareRootResult);

Output

Square Root: 5

User-defined functions, on the other hand, are functions that are defined by the programmer to perform specific tasks relevant to their program. These functions may utilize built-in functions within their definitions.

C++

#include <iostream>

// Using namespace std to avoid prefixing with std::
using namespace std;

int main() {
    // Now we can use cout and cin directly without std::
    cout << "Hello, World!" << endl;

    int number;
    cout << "Enter a number: ";
    cin >> number;
    cout << "You entered: " << number << endl;

    return 0;
}

Output

Hello, World!
Enter a number: You entered: 0

Functions in Programming

Functions in programming are modular units of code designed to perform specific tasks. They encapsulate a set of instructions, allowing for code reuse and organization. In this article, we will discuss about basics of function, its importance different types of functions, etc.

Functions in Programming

Table of Content

What are Functions in Programming?
Importance of Functions in Programming
Functions Declaration and Definition
Calling a Functions in Programming
Parameters and Return Values
Built-in Functions vs. User-Defined Functions
Recursion in Functions
Tips for Functions in Programming
Conclusion

Built-in Functions vs. User-Defined Functions

Functions in Programming

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