Question

Rotating bits in C

This rotates bits to the left which means the bits that were shifted off are then moved to the right side.

I need B5DE1FAA to become 7787EAAD

uiOrig = B5DE1FAA

k = 6

unsigned int rotateLeft(unsigned int uiOrig, int k){

}

Answer 1

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

#include <stdio.h>
unsigned int rotateLeft(unsigned int uiOrig, int k)
{
// left shift the bits k times.
unsigned int shiftedResult= (uiOrig<<k);
  
// now take the last k bits from original number and move it to front using
// right shift >> operator and | or operator
// here 8 is the number of bits in a byte.
shiftedResult |= uiOrig >> (sizeof(uiOrig)*8 - k);
  
// return the obtained result
return shiftedResult;

}

int main()
{
// test the method
unsigned int uiOrig=0xB5DE1FAA;
int k=6;
unsigned int shiftedResult=rotateLeft(uiOrig,k);
printf("The Result is: %X",shiftedResult);
return 0;
}

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SCREENSHOT: