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 mask = 0x0f;
   uint32_t field_mask = mask << 8;
   reg &= ~field_mask;
   uint32_t new_val = (baud & mask) << 8;
    return reg | new_val;
}

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