main.cpp

00001 /* ELEC1620 Lab 2 Task 10
00002 
00003 Bit-wise Operators
00004 
00005 (c) Dr Craig A. Evans, Feb 2017
00006 
00007 */
00008 #include "mbed.h"
00009 
00010 int main()
00011 {
00012     char a = 34;  // 0010 0010
00013     char b = 107; // 0110 1011
00014     printf("a = %i\n",a);
00015     printf("b = %i\n",b);
00016 
00017     printf("We'll shift a by one place to the left and store in c.\n");
00018     printf("This is the same as multiplying by 2.\n");
00019     char c = a << 1;  // 0100 0100 = 64 + 4 = 68
00020     printf("c = %i\n",c);
00021 
00022     printf("We'll shift b by fives place to the right and store in d.\n");
00023     printf("This is the same as dividing by 2^5 = 32.\n");
00024     char d = b >> 5;  // 0000 0011 = 2 + 1 = 3
00025     printf("d = %i\n",d);
00026     printf("Remember, these are integers so we lose the decimal places.\n");
00027 
00028     printf("Now we'll set bit 6 of c using the bit-wise OR operation.\n");
00029     char e = c | (1<<6);  // 0100 0100 | 0100 0000
00030     printf("It turns out bit 6 is already set and so the value doesn't change.\n");
00031     printf("e = %i\n",e);
00032 
00033     printf("Finally we'll clear bit 2 of c using the bit-wise AND and NOT operation.\n");
00034     char f = c & ~(1<<2);  // 0100 0100 & 1111 1011 = 0100 0000
00035     printf("f = %i\n",f);
00036 }