23. Set Baud Rate Field in Control Register

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

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    // Your code here
    uint32_t start = 8; 
    uint32_t end = 11;
    uint32_t length = end - start + 1;
    uint32_t mask = ((1U << length) - 1) << start;
    // uint32_t n_mask = ~mask; 
    reg &= ~mask; 
    uint32_t updated = (baud & ((1U << length) - 1)) << start;
    reg |= updated;
    return reg;
}

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