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)
{
    uint32_t new_baud = (uint32_t)baud;
    new_baud <<= 8;
    uint32_t mask = (1u<<4)-1;
    reg &= ~(mask << 8);
    reg |= new_baud;
    return reg;
}

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