Question

In C++ write a function object that compares two numbers and returns true if the first number is larger than the second number, and false otherwise. Use it to sort a vector of integers in descending order.

Answer 1

#include <iostream>
#include <bits/stdc++.h>

using namespace std;

bool compare (int a, int b)
{
if (a > b )
    return true;
else
    return false;
}

int main()
{
     vector<int> vect{ 1, 5, 8, 9, 3,25,7,11};        //Sample vector
     int vector_size = vect.size();       // storing the size of vector into vector_size
     int arr[vector_size], temp;
   
     for (int i=0; i<vector_size-1 ; i++)
     {
         for (int j=0; j< vector_size-i; j++)
         {
            bool comp = compare(vect[j],vect[j+1]); // assigning the output of function to variable comp
            if ( comp == false)                // if comp is false then
            {
                temp=vect[j];               //asigining the value of vect at j location to temp variable
                vect[j]=vect[j+1];           //swapping the values
                vect[j+1]=temp;               //swapping the values
            }
         
         }
     }
        for (int i=0; i <= vector_size-1 ; i++)
        {
            cout << vect[i] << endl;       //Printing the output of sorted vector
        }
    return 0;
}