Multiple Namespaces

#include<iostream>

namespace UART
{
    int baudRate = 115200;
}

namespace SPI
{
    int clockSpeed = 1000000;
}
using namespace std;
using namespace UART;
using namespace SPI;
int main ()
{
    cout<<"UART Baud: "<<baudRate<<endl;
    cout<<"SPI Clock: "<<clockSpeed<<endl;
}