Rotate Right in a 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>

uint32_t rotate_right(uint32_t reg, uint8_t n) {
    // Your code here
    uint32_t tmp = 0;
    uint32_t mark = 0;
    for(uint8_t k = 0 ; k < (n) ; k++)
        mark |= (1<<k);

    tmp = reg & mark;
    reg = reg >> n; 
    return reg | (tmp<<(32-n)) ;
}

int main() 
{
    uint32_t reg;
    uint8_t n;
    scanf("%u %hhu", &reg, &n);
    printf("%u", rotate_right(reg, n));
    return 0;
}

Solving Approach