23. Set Baud Rate Field in Control Register

#include <stdio.h>
#include <stdint.h>
#define BAUDRATE_BIT_MASK 0xFFFFF0FF //8-11 bits

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    return ((reg & BAUDRATE_BIT_MASK) | ((baud & 0x0F) << 8)) ;
}

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