Program to find Greatest of Three Numbers in C++

Following is the program to find greatest of three numbers.

#include<iostream.h>
#include<conio.h>

int main()
{
    float n1, n2, n3;
    cout << "Enter three numbers: ";
    cin >> n1 >> n2 >> n3;
    if (n1 >= n2 && n1 >= n3)
    {
        cout << "Largest number: " << n1;
    }
    if(n2 >= n1 && n2 >= n3)
    {
        cout << "Largest number: " << n2;
    }
    if(n3 >= n1 && n3 >= n2)
    {
        cout << "Largest number: " << n3;
    }
    getch();
    return 0;
}

Enter three numbers: 34 45 56
Largest number: 56