Question

Write a c function that rotates a 32 bit int one bit to the left using

#define MASK0 0x00000001
#define MASK31 0x80000000

Answer 1

solution:

#include<stdio.h>

#define INT_BITS 32

/*Function to left rotate n by 1 bits*/

int leftRotate(int n, unsigned int d)

{

/* In n<<d, last d bits are 0. To put first 3 bits of n at

last, do bitwise or of n<<d with n >>(INT_BITS - d) */

return (n << d)|(n >> (INT_BITS - d));

}

int main()

{

int n = 16;

int d = 1;

printf("Left Rotation of %d by %d is ", n, d);

printf("%d", leftRotate(n, d));

return 0;

}

Output:

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