Simple training demonstration to show the use of union and structure
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main.cpp
00001 /******************************************************************************* 00002 * This program demonstrates determines if a number is odd or even * 00003 * Jon Fuge V1.0 26/11/2013 First issue of code * 00004 *******************************************************************************/ 00005 #include "mbed.h" 00006 #include "USBSerial.h" 00007 00008 union byte // Define new type “BYTE” 00009 { 00010 char Byte; // Use this to map a byte 00011 struct { 00012 char Odd: 1; // this is the same as Bit0 00013 char Others: 7; // Just pad the rest of the bits 00014 }; 00015 }; 00016 00017 USBSerial serial; // Virtual serial port over USB. Use Teraterm as the interface 00018 00019 int main() { 00020 byte cMyNumber; // Declare variable cMyNumber 00021 cMyNumber.Byte = 53; // Set it to an odd number 00022 00023 wait (10); // Wait 10 seconds to connect port 00024 00025 if (cMyNumber.Odd == 1) 00026 serial.printf("%i is odd\n\r", cMyNumber.Byte); 00027 else 00028 serial.printf("%i is even\n\r", cMyNumber.Byte); 00029 00030 for(;;) {} // Loop forever 00031 }
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