How to use "double" ( you can use numbers like 5.4) in your programs.

 #include <iostream>
int main()
{
using namespace std; 
int num, num2, num3 , num4, num5, mynumber;
cout << "Enter the number you want to square: (im going to think that its a mm)";
cin >> num;
cout << "Really? O.o you dont have the brain to square it yourself? fine than... press any key to see the answer." << endl;
system("pause");
num2 = num * num;
cout << " Here you go you lazy monkey: " << endl;
cout << num;
cout << " mm = ";
cout << num2;
cout << "mm2" << endl;
cout << num2;
cout << " mm2 = ";
num3 = num2 / 100;
cout << num3;
cout << "cm2" << endl;
cout << num3;
cout << " cm2 = ";
num4 = num3 / 100;
cout << num4; 
cout << "dm2" << endl;
cout << num4;
cout << " dm = ";
num5 = num4 / 100;
cout << num5;
cout << "m2" << endl;
cout << num5;
cout << " m2 = ";
mynumber = num5 / 100;
cout << mynumber;
cout << "km2" << endl;
system("pause");
return 0;
}

int num, num2, num3 , num4, num5, mynumber;

double num, num2, num3 , num4, num5, mynumber;

#include <iostream>
using namespace std;

int main () {
double f;
     double m;

           cout << "Enter the length in feet:  ";
           cin >> f; // thats reading the number of f (feet)

           m = f / 3.28; // "converting" (soz my english is bad haha)
           cout << f << " feet is " << m << "meters.";

           return 0;
}