In-Built Functions

In addition to user-defined functions, C++ provides a rich set of in-built functions that can be used to perform various operations. These functions are already implemented in the C++ standard library, and you can directly use them in your code.

In this lesson, we will explore some commonly used in-built functions in C++.

Commonly Used In-Built Functions

sqrt

The sqrt function is used to calculate the square root of a number. It takes a single argument of type double or float and returns the square root as a double or float value.

1#include <cmath>
2
3int main() {
4  int num = 16;
5
6  // Using in-built function
7  double squareRoot = sqrt(num);
8
9  return 0;
10}

abs

The abs function is used to calculate the absolute value of a number. It takes a single argument of any integral type (int, long, char, etc.) and returns the absolute value as the same type.

1#include <cmath>
2
3int main() {
4  int num = -10;
5
6  // Using in-built function
7  int absoluteValue = abs(num);
8
9  return 0;
10}

max and min

The max and min functions are used to find the maximum and minimum values between two numbers, respectively. They take two arguments of the same type and return the maximum or minimum value as the same type.

1#include <algorithm>
2
3int main() {
4  int a = 5;
5  int b = 10;
6
7  // Using in-built functions
8  int maximumValue = max(a, b);
9  int minimumValue = min(a, b);
10
11  return 0;
12}

xxxxxxxxxx

#include <iostream>

#include <cmath>

​

int main() {

  int num = 16;

​

  // Using in-built functions

  int squareRoot = sqrt(num);

  int absoluteValue = abs(-10);

  int maximumValue = max(5, 10);

  int minimumValue = min(5, 10);

​

  std::cout << "Square root of " << num << " is " << squareRoot << std::endl;

  std::cout << "Absolute value of -10 is " << absoluteValue << std::endl;

  std::cout << "Maximum value between 5 and 10 is " << maximumValue << std::endl;

  std::cout << "Minimum value between 5 and 10 is " << minimumValue << std::endl;

​

  return 0;

}