Wrong result in c++ - c++

Question

I want to code currency converter and I do it,
but, When I tried it, result was wrong than I expected,
Knowing that the code works, but the result is not correct and I tried all the methods I know
, I am a beginner, please a answer my question, and Thanks
#include <iostream>
using namespace std;
int main()
{
cout << "1- EGP TO Usd" << endl;
cout << "2- USD TO EGP" << endl;
cout << "3- EGP TO SAR" << endl;
cout << "4- USD TO SAR" << endl;
cout << "5- SAR TO EGP" << endl;
cout << "6- SAR TO USD" << endl;
int num;
double balance;
double egpToUsd = .064;
double usdToEgp = 15.70;
double egpToSar = .24;
double usdToSar = 3.75;
double sarToEgp = 4.19;
double sarToUsd = .27;
cout << "Enter a Num: ";
cin >> num;
cout << "Enter your balance: ";
cin >> balance;
if (num >= 1 && num <= 6)
{
switch (num)
{
case 1:
cout << (balance / egpToUsd);
break;
case 2:
cout << (balance * usdToEgp);
break;
case 3:
cout << (balance / egpToSar);
break;
case 4:
cout << (balance * usdToSar);
break;
case 5:
cout << (balance * sarToEgp);
break;
case 6:
cout << (balance / sarToUsd);
break;
}
}
else {
cout << "Error please select from list" << endl;
}
return 0;
}

Answer 1

#include <iostream>
int main()
{
std::cout << "1- EGP TO Usd\n";
std::cout << "2- USD TO EGP\n";
std::cout << "3- EGP TO SAR\n";
std::cout << "4- USD TO SAR\n";
std::cout << "5- SAR TO EGP\n";
std::cout << "6- SAR TO USD\n";
int num;
double balance;
double egpToUsd = .064;
double usdToEgp = 15.70;
double egpToSar = .24;
double usdToSar = 3.75;
double sarToEgp = 4.19;
double sarToUsd = .27;
std::cout << "Enter a Num: ";
std::cin >> num;
std::cout << "Enter your balance: ";
std::cin >> balance;
switch (num)
{
case 1:
std::cout << (balance * egpToUsd);
break;
case 2:
std::cout << (balance * usdToEgp);
break;
case 3:
std::cout << (balance * egpToSar);
break;
case 4:
std::cout << (balance * usdToSar);
break;
case 5:
std::cout << (balance * sarToEgp);
break;
case 6:
std::cout << (balance * sarToUsd);
break;
default:
std::cout << "Error please select from list\n";
break;
}
return 0;
}
Dont Use "using namespace std;" thats bad practice and why were you dividing in some cases, its a simple math. I hope you got your solution