#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

/**
 * A programme demonstrates using bitwise operators for multiplication
 * Tested using Code::Blocks and Windows 7 Professional SP1
 *
 * @Author:     Shaun B
 * @Version:	1.0.0.1 - 2012-09-13
 * @Todo:
 *
 **/

static int a=0;
static int times[12];
int main();

int main()
{
    system("cls");
    printf("Demonstration of using bitwise operators to multiply whole numbers.\n\n");
    printf("Please enter a number\n");
    printf("C:\\>");
    scanf("%d",&a);
    times[ 0]=  0;
    times[ 1]=  a;                              /**Times 1*/
    times[ 2]=  a<<1;                           /**Times 2*/
    times[ 3]=  (a<<1)+a;                       /**Times 3*/
    times[ 4]=  a<<2;                           /**Times 4*/
    times[ 5]=  (a<<2)+a;                       /**Times 5*/
    times[ 6]=  (a<<2)+(a<<1);                  /**Times 6*/
    times[ 7]=  (a<<2)+(a<<1)+(a);              /**Times 7*/
    times[ 8]=  a<<3;                           /**Times 8*/
    times[ 9]=  (a<<3)+(a);                     /**Times 9*/
    times[10]=  (a<<3)+(a<<1);                  /**Times 10*/
    times[11]=  (a<<3)+(a<<1)+(a);              /**Times 11*/
    times[12]=  (a<<3)+(a<<2);                  /**Times 12*/
    for(int i=0; i<=12; i++)
    {
        printf("%4d x %4d = %10d\n", a, i, times[i]);
    }
    printf("\nPress the any key to end demonstration...");
    _getch();
    return 0;
}