File content as of revision 0:b4c1e32627f2:

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#include "sample_select.h"

#if (SAMPLE_PROGRAM_NO == 7)
// SAMPLE_PROGRAM_NO  7 : USBSerial (CDC) sample
// 
// USBSerial example
// Virtual serial port over USB
// [Attention!] Delete the "OVERRIDE_CONSOLE_USBSERIAL" macro in "mbed_app.json" file if it is set.

#include "mbed.h"
#include "USBSerial.h"

int main() {
    USBSerial serial;

    ThisThread::sleep_for(0.1);
    serial.printf("I am a virtual serial port\r\n");

    // echoback
    while (1) {
        if (serial.readable()) {
            serial._putc(serial._getc());
        }
    }
}

#endif