mbed Serialport read and write

gistfile1.txt

#include "mbed.h"              

Serial pc(USBTX, USBRX);
DigitalOut myled(LED1);

char serialValue;

int main() {
    while(1) {
        if(pc.readable()) {
            serialValue = pc.getc();
            pc.putc(serialValue);
            if (serialValue == '1') {
                myled = 1;
            }
            else  {
                myled = 0;
            }
        }
    }
}