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/*
* Shift operations
*
* Right shifts might use either arithmetic shifts or logical shifts.
*
* This small piece of code should identify which one is used
*/
#include <stdio.h>
int main(void)
{
/* Using char so we care for a single byte only */
char x, a;
unsigned char y, b;
/* bin 10101001 */
a = b = 0xA9;
printf("Original signed variable: 0x%.2x\n", a);
/*
* Signed data variables are right shifted using Arithmetic shift. i.e.
* left bits are filled with a copy of the most significant bit of the
* original value
*/
x = a >> 3;
printf("Signed right shift by 3: 0x%.2x\n\n", x);
printf("Original unsigned variable: 0x%.2x\n", b);
/*
* Unsigned data variables are right shifted logically. i.e. left bits
* are just filled with zeros
*/
y = b >> 3;
printf("Unsigned right shift by 3: 0x%.2x\n", y);
return 0;
}
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