what algorithm sort use c++ code example

Example 1: sort c++

sort(arr, arr+length); //increase
sort(arr, arr+length, greater<int>()); //decrease

Example 2: sorting algorithm c++

#include<iostream>
using namespace std;

int main(int argc, char const *argv[])
{
    int numb[7];
    int i, j;

    for(i=0;i<=6;i++)
    {
        cout << "Enter a number" << endl;
        cin >> numb[i];
    }

    for (i=0;i<=5;i++)
    {
        for (j=i+1;j<=5;j++)
        {
            int temp;

            if (numb[i] > numb[j])
            {
                temp = numb[i];
                numb[i] = numb[j];
                numb[j] = temp;               
            }
          }
        }
        for (i=0;i<=6;i++)
        {
            cout << endl << numb[i] << endl;
        }
}