The **`min()` function** in C++ accepts two values and returns the smaller one. This function is available in `<algorithm.h>`.

# Parameters
The `min()` function accepts the following parameters.
* **`first_value`:** This is the first value that we want to compare.
* **`second_value`:** This is the second value to compare with the first one.
   > You need to pass the two values of same type.

* **`comparator`:** This is an optional parameter that specifies the condition when the first value should come and when the second value should come. In other words, you can pass a function that returns a Boolean value that denotes which value to pick out of the two given values.

# Return

The `min()` function returns the minimum value from the two given values.

# Code
Let's look at the code now.


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

int main() {
  int int_result = min(10, 20);
  cout << "Minimum is: " << int_result << endl;

  char char_result = min('a', 'b');
  cout << "Minimum is: " << char_result;
  return 0;
}

# Explanation

* In _lines 1 and 2_, we import the required header files.
* In _line 6_, we call the `min()` function and pass two integer values.
* In _line 7_, we print the minimum of the two integers.
* In _line 9_, we again call the `min()` function, but here we pass two character values.
* In _line 10_, we print the minimum of the two character values.

How to use min() function in C++

The min() function in C++ returns the smaller of two values, with an optional comparator for custom conditions.