Random Unique Number Generator

#include <iostream>
#include <windows.h>
#include <stdlib.h>
#include <time.h>

using namespace std;

int main()
{
    //create array (make the size the # of numbers you want to generate)
    int array[40];
    //temp variable for swapping
    int temp;
    srand(time(NULL));
    //creating array in order (starting from 1 ending at whatever number you choose (40 in this case)
    for(int c=0;c<40;c++)array[c]=c+1;
    //displaying each number (unnecessary, just for visualization)
    for(int c=0;c<40;c++)cout<<array[c]<<" ";
    //for loop to swap numbers
    for(int c=0;c<40;c++)
    {
        //generating random number from 1-n
        int x=rand()%40+1;
        //setting original number to temp
        temp=array[c];
        //replacing new number with old one
        array[c]=array[x];
        //setting temp to the new number
        array[x]=temp;
    }
    cout<<endl;
    //displaying your now randomly sorted numbers
    for(int c=0;c<40;c++)cout<<array[c]<<" ";
    return 0;
}